ENGINEERING RESEARCH PAPERS

free research paper on mimo-ofdm recent 2014




A NOVEL APPROACH TO REDUCE PAPR IN OFDM SYSTEM USING DHT PRECODNG FOR M-QAM
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The main challenging issue for OFDM Systems is its high PAPR. In this paper a pre-coding based PAPR reduction technique is proposed using Discrete Hartley Transform (DHT). A comparative analysis is done with the proposed method against Walsh Hadamard

A Real Time Adaptive Resource Allocation Scheme for OFDM Systems Using GRBF-Neural Networks and Fuzzy Rule Base System
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Abstract: Adaptive Resource Allocation is a prominent and necessary feature of almost all future communication systems. The transmission parameters like power, code rate and modulation scheme are adapted according to the varying channel conditions so that

A Precise Synchronization Scheme Using in the Underwater Acoustic Communication System Based on FRFT-OFDM
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Abstract:Synchronization is very important in underwater acoustic OFDM communication system based on the fractional Fourier transform (FRFT-OFDM). To improve the synchronization performance, a new way is proposed in this paper, which use symmetrical

All optical OFDM generation for IEEE802. 11a based on soliton carriers using microring resonators
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Abstract: The optical carrier generation is the basic building block to implement all-optical orthogonal frequency-division multiplexing (OFDM) transmission. One method to optically generate single and multicarriers is to use the microring resonator (MRR). The MRRs can

OFDM vs. Single Carrier Modulation–an Achievable Rate Perspective
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Abstract:We compare analytically the maximum achievable rates of reliable communication in single carrier and OFDM modulation schemes, under the practical assumptions of iid finite alphabet inputs and linear ISI with additive Gaussian noise. Our

Phase-conjugated subcarrier coding for fibre nonlinearity mitigation in CO-OFDMtransmission
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Abstract We demonstrate a novel subcarrier coding scheme combined with pre-EDC for fibre nonlinearity mitigation in CO-OFDM, showing that a performance improvement of 1.5 dB can

Adaptation of OFDM under Visible Light Communications and Illumination Constraints
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Abstract Orthogonal frequency division multiplexing (OFDM) is increasingly studied and adopted as a modulation technique for RF and optical communication systems. In this paper, we investigate challenges to the adoption of OFDM for use in lighting systems that support

Reversible steganography on OFDM channel: A role of cyclic codes
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Abstract: In the era of wireless communication, the World Wide Web is the brain child of all the new technological development. This digital world has speeded up the data transfer and communication speed a manifold, creating new goods and services all along. Along with

Data puncturing in OFDM channel: A multi carrier stego
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Abstract: The prospects of the next generation wireless broadband applications will be enhanced by the features like improved Signal to Noise Ratio (SNR) and variable higher data rates. The Orthogonal Frequency Division Multiplexing (OFDM) system offers better

A novel architecture for all-optical add-drop multiplexing of OFDM signals
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Reconfigurable optical add-drop multiplexers (ROADM) and cross-connects established the concept of transparent networking by enabling all-optical switching and dynamic routing of the network traffic1, 2. Their switching functionality is based on the use of reconfigurable

Reversible steganography on OFDM channel-a role of RS coding
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Abstract: The kinetics of higher data requirements in the upcoming wireless generation is engendered by the fact that the usage of high quality multimedia applications in the form of data, audio, SMS and video is on the rise. In order to meet the challenging needs of the

Inserted embedding in OFDM channel: A multicarrier stego
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Abstract: Stupendous advances in Digital Communication have brought about the advent of internet culture benefiting the people in many ways. Iust as fire is a good servant, but a bad master, so is the case with internet. With internet, stealing and unauthorised usage of data

Controlled OFDM Measurements at Extreme Velocities
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ABSTRACT LTE is designed to work at velocities exceeding 400km/h. Measuring the physical layer performance that can be achieved at such high speeds in real-world scenarios is conceptually straightforward when using off-the-shelf test equipment in drive-

2X2 STBC MIMO OFDM RECEIVER DESIGN FOR WLAN WITH ESTIMATION OF DIFFERENT TRANSMIT CARRIER FREQUENCY OFFSETS
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The combination of Multiple-Input Multiple output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) has been viewed as the trend of the new wireless LAN technology. In this paper, the design of an up-to-date 2 x 2 Space-Time Block Coded (STBC)

Optical polar OFDM: on the effect of time-domain power allocation under power and dynamic-range constraints
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Abstract Polar OFDM (P-OFDM) is an OFDM format that can double the spectral efficiency of existing real-valued and unipolar optical OFDM intensity-modulation with direct detection (IM/DD) optical communication systems. P-OFDM modulates the amplitude and phase of a

Implementation of Optimization Algorithm by Sub-Carriers Assignment and Power Allocation for LTE and Cognitive Radio Network using OFDM Signal
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ABSTRACT The optimization algorithm had been analysed for the improvement of the spectrum efficiency and check trade-off between capacity and fairness for cognitive networks in a low algorithm complexity. Different low complexity algorithms for proportional

Subcarrier Index Coordinate Expression (SICE): An Ultra-low-power OFDM-compatible Wireless Communications Scheme Tailored for Internet of Things
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Abstract:This paper describes a novel data modulation method for ultra-low-power wireless uplink communication between a client device of the internet of things (IoT) and a base station (or an access point). The proposed scheme is dubbed as subcarrier index

Reduction of Paper in OFDM System Using Haar Wavelet Based Approach
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Abstract:-Communication is one of the important aspects of life. With the advancement in age and its growing demands, there has been rapid growth in the field of communications. Signals, which were initially sent in the Analog domain, are being sent more and more in

HARDWARE EFFICIENT SINGULAR VALUE DECOMPOSITION IN MIMO-OFDM SYSTEM
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ABSTRACT This paper presents an adaptive hardware design for computing Singular Value Decomposition (SVD) of the radio communication channel characteristic matrix and is suitable for computing the SVD of a maximum of 4× 4 realvalue matrices used in (multiple

STUDY OF MUD IN OFDM-IDMA SYSTEM WITH CFO EFFECTS
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Abstract: In this paper we discussed the various features of OFDM and IDMA. This includes low multiple user detection with low cost with flexible adaption rate, it also include various diversities in frequency with spectral and power advantages. OFDM-IDMA scheme is also

Performance Evaluation of OFDM System for Different Modulation Techniques on the basis of Bit Error Rate and Peak to Average Power Ratio
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ABSTRACT Orthogonal frequency division multiplexing (OFDM) is a form of digital modulation used in a wide array of communication systems. This paper presents a comprehensive performance analysis of orthogonal frequency division multiplexing

A Novel methods of ICI self Cancellation Scheme in OFDM System
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ABSTRACT In OFDM System the Frequency offset in wireless communication systems distort the Orthogonality between subcarriers resulting in Inter Carrier Interference (ICI). This Paper presents a new scheme for ICI self cancellation which is simple and convenient

Efficient QRD-M Detection in the MIMO-OFDM System
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Abstract. In this paper, the improved QR-decomposition with M algorithm (QRD-M) for efficient signal detection is proposed. In order to improve efficiency in terms of complexity and detection performance, the proposed detection scheme adjusts the number of

Simulation on Effect of Doppler shift in Fading channel and Imperfect Channel Estimation forOFDM in Wireless Communication
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Abstract: In wireless communication system the transmitted signal is distorted by various phenomena that are intrinsic to the structure and contents of the wireless channel. Among these fading and interference are the main dominant sources of distortion that are

Image Transmission on Wireless Network by Using Ofdm Technology with Rayleigh Fading Channel
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Abstract In this paper, an gray scale (8 bit) bit map image is transmitted by the transmitter and by using the orthogonal frequency division multiplexing with through the Rayleigh fading channel. individual frame is transmitted in parallel so that multi input channel can

High Speed OFDM Implementation in FPGA
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Abstract:FPGA is one of the efficient economic way to implement the circuit. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique. OFDM provides high bandwidth efficiency because the carriers are orthogonal to each other and

Low-complexity Equalization of OFDM systems using Krylov subspace methods over Doubly Selective Channels
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Abstract:Low complexity equalization with LSRQ and GMRES algorithm is compared with traditional equalization methods. As the next generation technologies like LTE and WiMax have a large number of subcarriers the traditional equalization methods like MF, ZF,

The Assessment and Analysis of using a Temperature Sensor to Regulate the Automatic Gain Control of the Amplifier in a FLASH-OFDM System
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Abstract:This study emphasizes the simulation and analysis of the compensatory effect of temperature on automatic gain control (AGC). From the analytical results, a temperature regulation mechanism was proposed. The technology most appropriate for and adaptive

The Analysis of MIMO/OFDM Networks with group-selected Arrays signal Processing
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Abstract Orthogonal frequency division multiplexing (OFDM) is a multi-carrier block modulation scheme suitable for wireless communication. OFDM has attracted a lot attention in broadband wireless systems. The use of group selected Adaptive arrays signals

Performance Evaluation of Error Correcting Techniques for OFDM Systems
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Abstract Orthogonal frequency-division multiplexing (OFDM) systems provide efficient spectral usage by allowing overlapping in the frequency domain. Additionally, they are highly immune to multipath delay spread. In these systems, modulation and demodulation

Analysis of Alamouti-based space-frequency coding technique for OFDM
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ABSTRACT This paper presents Space-Frequency Coded OFDM system consisting of two transmitters and a single receiver utilizing Simple Alamouti space time code technique. An M- ary PSK modulation is used to modulate the symbols across an OFDM channel. We have

Performance Evaluation using MQAM Modulated Optical OFDM Signals
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Abstract:OFDM (Optical Orthogonal Frequency Division Multiplexing) in the optical domain is an emerging technology for fulfilling increased bit rate demand of real time sophisticated applications. In this work an optical OFDM system is designed using different M-ary QAM (

SEE-OFDM: spectral and energy efficient OFDM for optical IM/DD systems
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Abstract In the next major phase of mobile telecommunications standards 5G, Visible Light Communication (VLC) technology or light fidelity (Li-Fi) has great potential to be a breakthrough technology in the future of wireless Internet access. We propose a novel real

Analysis of ofdm and owdm system with various wavelets families
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ABSTRACT-To increase the data rate of wireless standard orthogonal frequency division multiplexing (OFDM) is used which is a great method that uses an Inverse Fast Fourier Transform (IFFT) at the transmitter to modulate a high bit-rate signal into a number of sub-

Performance Analysis of Optical Communication Systems using OFDM by Employing QPSK Modulation
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Abstract:-The high data rate along with good Quality of Service (QoS) requirements of Next Generation Network (NGN) can be fulfilled by using the optical fiber communication networks. At high data rate, dispersion will be the limiting factor which needs to be suitably

Position Location using OFDM signal in LCX Linear Cell MIMO System
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Abstract:This paper proposes a new scheme of position location for radio terminals using MIMO-OFDM signal. First, this paper describes on a system configuration of LCX linear cell MIMO system and its research issues. Second, to observe channel responses depending

Techniques Performance Analysis and Linking to OFDM and MIMO
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Abstract: The next generation wireless broadband communication services has been developed in last several years. In last few years, wireless communications have gained enormous popularity in all over the world. Orthogonal Frequency Division Multiple Access

A Low-Complexity Integer Frequency Offset Estimation Scheme Using Combined Training Symbols for OFDM Systems
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ABSTRACT In orthogonal frequency division multiplexing (OFDM) systems, an integer part of a frequency offset (IFO) that causes ambiguity in data demodulation is estimated generally by comparing correlations between the received and local signals for IFO candidates. In

Combined Effect of Block interleaving and FEC on BER Performance of OFDM based WiMAX (IEEE 802.16 d) System
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Abstract In this World of Digital era the demand of mobile Internet and wireless multimedia applications are growing faster than ever. To satisfy the user requirements and to overcome the limitations of existing wireless technologies, have led the researchers to come up with

Simulation of Turbo Coded OFDM System
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Abstract:-The popularity of Orthogonal Frequency Division Multiplexing (OFDM) has been increasing rapidly in a high speed wireless communication systems. In OFDM we basically divide a wideband fading channel into a narrowband channels. OFDM is capable of

Optimal Performance of OFDM Signal using PAPR Reduction Techniques in LTE Systems
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Evolution (LTE) has been designed to provide more efficient use of radio networks. The LTE provides scalable bandwidth, latency reduction and higher data rates with improved mobility. Single carrier Frequency Division Multiple Access (SC-FDMA) has been selected

Design of MIMO OFDM SDM Systems for High Speed Data Transmission
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ABSTRACT A combination of Multiple-Input Multiple-Output Spatial Division Multiplexing technology and Orthogonal Frequency Division Multiplexing technique, namely MIMO- OFDM SDM systems, been well-known as a potential technology to provide high speed

Fiber nonlinearity Mitigation in CO-OFDM Systems using Dual Compensators
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Abstract: We simulate frequency domain dual compensators for nonlinear phase noise mitigation in a 1200 km 40 Gbps coherent optical OFDM transmission system with inline dispersion compensation. This technique effectively compensates SPM induced by fiber

A Review On Various Approaches to Reduce Intersymbol Interference in MIMO–OFDMSystem
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Abstract MIMO-OFDM (Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing) system has been recognized as one of the most popular and competitive technique in a wireless environment now a days. The performance is calculated in terms This paper presents a first order Takagi–Sugeno–Kang (TSK) type self–constructing, adaptive, online, transversal, fuzzy equaliser to mitigate nonlinear power amplifier distortion effects from received signal in orthogonal frequency division multiplexing (OFDM) systems

A Study On Different Techniques For PAPR Reduction In OFDM System
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Abstract:The increasing demand on high bit rate and reliable wireless and wire line system has junction rectifier to several new rising modulation techniques. one among the techniques are going to be Orthogonal Frequency Division Multiplexing (OFDM), that

Performance Analysis of Various Equalizers for ISI reduction in MIMO-OFDM System
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Abstract-For high speed data transmission system quality is a big challenge. In case of multiple-input multipleoutput (MIMO) system, orthogonal frequency division multiplexing (OFDM)target. Inter Symbol Interference has

Adaptive Modulation and Coding with Channel State Information in OFDM for WiMAX
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Abstract:WiMAX is a broadband wireless communication system which provides fixed as well as mobility services. The mobile-WiMAX offers a special feature that has adopted an adaptive modulation and coding (AMC) in OFDM to provide higher data rates and error

A Review of Channel Estimation Techniques in OFDM Systems–Application to PAPR Reduction
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Abstract-The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and

Diversity Analysis for Relay-Assisted Distributed BICM-OSTBC-OFDM System
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Abstract:-Maximum spatial-frequency diversity can be achieve by combining bit-interleaved coded modulation (BICM), orthogonal space-time block coding (OSTBC) and orthogonal frequency division multiplexing (OFDM) in frequency selective multi-path fading channels,

Joint Spectrum Sensing and Resource Allocation for OFDM-based Transmission with a Cognitive Relay
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Abstract In this paper, we investigate the joint spectrum sensing and resource allocation problem to maximize throughput capacity of an OFDM-based cognitive radio link with a cognitive relay. By applying a cognitive relay that uses decode and forward (DF), we

BER Analysis with Adaptive Modulation Coding in MIMO-OFDM for WiMAX using GNU Radio
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Abstract This paper explores how MIMO increases channel capacity and how the fundamental characteristics of a MIMO system can create significant test challenges. Spatial modulation (SM) is the latest developed modulation method in the field of communication.

An Improved Transmission Rate Achievement in Cooperative Communication System Based on OFDM
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Abstract. Recently, cooperative system is an interesting issue in communication systems. Single mobile antenna can have transmission diversity gain by the cooperative system as multiple input multiple output (MIMO) system. However, the most of the cooperative

Crest factor reduction for OFDM using selective subcarrier degradation
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Abstract: This paper describes a crest factor reduction (CFR) method that reduces peaks in the time domain by modifying selected data subcarriers within an OFDM signal. The data subcarriers selected for modification vary with each symbol interval and are limited to

COMPARATIVE PERFORMANCE OF MIMO OFDM SYSTEM WITH PILOT-BASED MMSE CHANNEL PREDICTION
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Abstract: This paper presents a comparative performance analysis of wireless multiple input multiple outputorthogonal frequency division multiplexing (OFDM) system with the implementation of comb type pilot-based channel prediction algorithm. The Minimum

Real Time Implementation of a High Performance MIMO-OFDM WLAN for Image Transmission
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Abstract-The multicarrier transmitter and receiver system such as the Orthogonal Frequency Division Multiplexing (OFDM) is designed to transmit an image in real time. This Tx/Rx has been carried out in Xilinx EDA tool for FPGA family processor (XC5VLX20T) which

Design and Implementation of OFDM transmitter and receiver using 8-point FFT/IFFT
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier system where data bits are encoded to multiple subcarriers, while being sent simultaneously. This results in the optimal usage of bandwidth. A set of orthogonal sub-carriers together forms

Analysis of MRC and OC with OFDM In Terms Of BER Using Different Modulation Techniques over Rayleigh Channel
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ABSTRACT: In wireless communication due to presence of multipath fading effects and noise, antenna diversity is an important technique to mitigate these effects. The antenna diversity is the most cost effective technique to improve system performance and to

ICI Cancellation Using Zero-padded Conjugate Transmission: With Adaptive Receiver forOFDM System
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Interference (ICI) in OFDM system, the Zero-padded Conjugate scheme with adaptive receiver is proposed. In the conjugate algorithm first path contains the regular OFDM signal and in second path conjugate of first path is transmitted using Time Division multiplexing (

Performance Analysis of Adaptive MIMO Based OFDM using FFT and DWT
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In wireless communication systems proposal the wavelets require valuable applicability, by way of channel characterization, interference modification, modulation then multiplexing numerous access communication, Ultra Wide Band (UWB) communication, cognitive radio

OFDM-aided differential space–time shift keying using iterative soft multiple-symbol differential sphere decoding
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(MSDSD) is proposed for orthogonal frequency-division multiplexing 7 (OFDM)-aided differential space–time shift keying (DSTSK)-aided trans-8 mission over frequency-selective channels. Specifically, the DSTSK sig-9 naling blocks are generated by the channel-

Spectral Efficiency Improvement with Beating Interference Reduction by Iterative DSP in a Multiband DDO-OFDM Receiving System
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Abstract:For an efficient enhancement of the data capacity, multiband configuration has been widely applied in direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system recently. To improve the spectral efficiency, we propose a signal-

2x2 MIMO OFDM Systems for Adaptive Channel Estimation technique
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Abstract:In this paper analysis of least squares (RLS) algorithm and LMS algorithm is proposed for multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. These two algorithms are used as adaptive channel

FrFT based OFDM system for Wireless Communication
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Abstract The demand for higher data rates over wireless channels is growing day by day. This had provided by 4G systems by using multicarrier communication systems like OFDM. The BER of 4G systems can further improve by doing time, frequency analysis of signal

Performance Analysis of OFDM with Wiener Phase Noise
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Abstract:We analyze the effect of Wiener phase noise on the capacity and signal-to- interference-plus-noise (SINR) ratio. Our analysis includes phase noise at the transmitter and receiver end of an OFDM communication link. We see that the capacity and SINR are

Filter Based Interference Mitigation in Multi Band-OFDM
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Abstract: This study aims at to mitigate the interference between the primary user and secondary user in the wireless environment. This becomes necessary task because with the growing demand for bandwidth for wireless connectivity, it has become essential to come

A Blind OFDM Signal Detection Method Based on Cyclostationarity Analysis
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In this paper, we present a novel technique to sense, blindly infer signal features (FFT size, cyclic prefix (CP) length), and detect OFDM signals based on second order cyclostationarity analysis. First, we infer accurate FFT size and CP length from the sensed signal based on

Evaluation of Optimized PAPR and BER of OFDM signal by using Clipping and Filtering Technique.
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Abstract:-Orthogonal Frequency Division Multiplexing (OFDM) is an emerging field of research in the field of wireless communication and finds its application where high data rate is required at low latency and better spectral efficiency. Peak to Average Power Ratio (

OFDM BASED VISIBLE LIGHT BROADCASTING SYSTEMS
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Materials and methods. In order to model the wireless channel, we have created a three dimensional model of the office space under consideration in Zemax and integrated the multiple lighting sources and photodetectors in the model. Using the non-sequential ray

MIMO-OFDM Channel Prediction Using Pilot Carries
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Abstract: A multiple-input multiple-output (MIMO) communication system combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over broadband wireless channels. Channel state

Low Complexity QRD-S Using Channel State Information in MIMO-OFDM System
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Abstract. In this paper, an adaptive detection scheme is proposed to reduce the complexity. The QRD-S detection scheme reduces the complexity by reflecting the channel state

A MB-Pulsed-OFDM System Using Discrete Wavelet Packet Transform for Short Range Indoor Wireless Environment
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Multiplexing (MB-OFDM) approach using UWB signals with short duration of pulses provide unique opportunities in short-range high data rate wireless applications possessing easy penetration capability through obstacles, high precision ranging and low processing

Partial Transmit Sequence Scheme For PAPR Reduction In OFDM Systems: A Review
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Abstract The high Peak to Average Power Ratio (PAPR) of the transmitted signals the main drawback of OFDM system. OFDM Suffers as the no of Subcarriers operating in the large dynamic range operates in the non-linear region of amplifier due to OFDM suffer the

Secure Color Image Transmission in a Downlink JP-COMP Based MIMO-OFDM Wireless Communication System
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Abstract: In this paper, we made a comprehensive BER (bit error rate) performance simulative study on secure color image transmission in a joint processing-coordinated multipoint aided MIMO-OFDM (multiple input multiple output-orthogonal frequency

DFT-based Cluster Analysis Channel Estimation Algorithm for OFDM Systems on Multipath Channels.
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Abstract In this paper, a enhanced DFT-based channel estimation for OFDM systems is proposed. Conventional DFT-based channel estimations improve the performance by suppressing time domain noise beyond the length of the cyclic prefix (CP), so it does not

Performance Evaluation of WDM-RoF System Based on CO-OFDM using Dispersion Compensation Technique
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Abstract:In this paper, we presented a system design that integrates Coherent-Optical- Orthogonal-Frequency-Division Multiplexing (CO-OFDM) with Wavelength-Division Multiplexing–Radio over Fiber (WDM-RoF) together with dispersion compensation

Reduction of PAPR of OFDM Symbols Using Modified Phasing Sequences
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Abstract:This paper discusses the limitation of the phasing technique proposed by for reducing the PAPR of OFDM symbols. It is shown that although the phasing sequence proposed works well for constant

PAPR Reduction in MIMO OFDM System Using Improved Constant Modulus Algorithm
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Abstract:MIMO OFDM has gained importance with the increase in demand of high speed data communication. MIMO OFDM also qualifies 4G standard due to high bandwidth frequency. Despite of many merits MIMO OFDM suffers from high peak to average power

Weighted Sum-rate Maximization for Multi-user Mimo-OFDM Downlink with ZF-DPC Methods
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Comparison of PAPR Reduction of OFDM Signals Using Pseudo Random PTS and Clipping and Filtering Method
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Abstract Many methods have been proposed to reduce the high PAPR problem. Partial transmit sequence (PTS) is one of the most popular peak-toaverage power ratio (PAPR) reduction technique proposed for orthogonal frequency-division multiplexing (OFDM)

A High-performance Implementation of OFDM-MIMO Base-band in Wireless Video System
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Abstract: Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) become the key technology of next generation wireless communication system. In order to support wireless transmission of real-time high-definition video, an

On the potential of OFDM enhancements as 5G waveforms
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Abstract:The ideal radio waveform for an upcoming 5th Generation (5G) radio access technology should cope with a set of requirements such as limited complexity, good time/frequency localization and simple extension to multi-antenna technologies. This

An Adaptive Precoder for Out-of-band Power Reduction in OFDM-Based Cognitive Radio System.
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Abstract Out-of-band (OOB) power emission is a conventional issue in orthogonal frequency division multiplexing (OFDM) system. The spectral leakage results in interference to licensed users (LU) in OFDM-based cognitive radio (CR) system. In this article, an adaptive

PAPR Reduction using Companding and FEC Coding in OFDM System
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Abstract The next generation of mobile wireless communication is based on OFDM technology. It is an efficient method of data transmission for high speed communication system. It provides high spectral efficiency, less vulneralibility to echoes, low

Performance Analysis of 2x2 MIMO for OFDM-DSSS Based Wireless System
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Abstract:In today's 3G world moving to 4G requires high data rate support in applications like multimedia services, internet access and video streaming services. Such applications are always in need of very high speed data rate support which increases the requirement

Method of Doppler Frequency Spread Estimation for High-Mobility OFDM Systems
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A method of Doppler frequency spread (DFS) estimation algorithm is discussed which is suitable for high-mobility Orthogonal Frequency Division Multiplexing (OFDM) systems. DFS is a main factor which may mitigate the performance of system. The proposed method is

A closed concept for OFDM-Synchronization in 3GPP LTE Systems
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Division Multiplexing (OFDM) for its downlink and Single-Carrier Frequency-Division Multiple Access (SC-FDMA) for its uplink. The bases used for comparison will be capacity, outage probability and peak-to-average power ratio (PAPR). While the first two bases

AN IMPROVED METHOD FOR THE ESTIMATION OF CARRIER FREQUENCY OFFSET INOFDM SYSTEMS
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In the latest development of Orthogonal Frequency Division Multiplexing (OFDM) communication system, the system performance can be distracted by the Frequency Offsets (FOs) which can demolish the orthogonality of the subcarriers, and hence leads to a

Correntropy-Based Blind Channel Estimation for MIMO-OFDM Systems
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The next generation wireless communication systems are required to provide very high data rate and guaranteed Quality of Service (QoS) over hostile radio channels. To this end, accurate Channel State Information (CSI) is required at the receiver. Most of the channel

Performance Analysis of DWT-OFDM Diversity for Standard SV-Model Based UWB System
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ABSTRACT Recent generation communication system has a serious challenge of accommodating more users within limited allocated bandwidth without affecting the system performance. OFDM is used to cater for increased data rate of wireless medium with good

Deterministic Sequences From a Fibonacci Series For PAPR Reduction in SLM-OFDMSystems
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Abstract:Chaotic-Binary (CB) sequences have been successfully employed in selected mapping (SLM) schemes to reduce peak to average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems. However, construction and

New Efficient Timing and Frequency Error Estimation in OFDM
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Abstract Orthogonal frequency division multiplexing (OFDM) technique is being applied extensively to high data rate digital transmission as it is a bandwidth efficient modulation scheme. In OFDM system, intersymbol interference (ISI) and intercarrier interference (ICI)

Carrier Frequency Offset Estimation Techniques in OFDM System: A Survey
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Abstract:Orthogonal Frequency Division Multiplexing (OFDM) has proved it is ability to provide the required services and offer large data rates with sufficient strength to Electromagnetic wave channel destruction The major drawback concern in the OFDM

Key Technologies for Optical OFDM in Optical Long-Haul System Using Direct-Detection
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Page 1. Key technologies for Optical OFDM in Optical Long-Haul System Using Orthogonal frequency multiplexing (OFDM), which has emerged to be the leading modulation technology for the wireless and wire line system in RF domain, can also be applied in optical domain.

Review on FPGA Implementation of OFDM
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Abstract-The technique of orthogonal frequency division multiplexing (OFDM) is famous for its robustness against frequency-selective fading channel. This technique has been widely used in many wired and wireless communication systems. The main objective of this

Novel Sub-carriers Iterative Restructuring Method in OFDM: Toward Extra Equalization Omitted
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Abstract: This study considered a receiver equalization problem in wireless communication area. Receiver equalizations in OFDM proceeding through sub-carriers varied ness in frequency guarantee transmit system bit error rate thus are essential. Zero-Forcing (ZF The wireless mesh security networks (WMSN) are widely used in next generation communications due to their coverage and convenient deployment. However, when radio nodes communicate with each other simultaneously in a single network, interference may Dynamic allocation of the resources for optimum utilization is one of the most important fields of study in engineering as well as other disciplines nowadays. In this process the available resources are allocated in such a way that these resources are maximally utilized to

BER Analysis of OSTBC-MIMO-OFDM Systems using Triple-Polarized Antennas
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Abstract:Diversity and data rate over multipath fading channels in wireless communication systems can be significantly enhanced by the combined use of orthogonal space-time block coding (OSTBC) multiple-input multiple-output (MIMO) orthogonal frequency division

Dynamic Sparse Channel Estimation Based on Kalman Filter with Nonlinear Equality Constraint in OFDM Systems
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Abstract The time-varying sparse channel estimation for Orthogonal Frequency Division Multiplexing (OFDM) systems is considered in this article. The basic Compressed Sensing (CS) framework is mainly concerned with time-invariant sparse signals and builds upon a

POWER ALLOCATION SCHEMES FOR MIMO-OFDM BASED COGNITIVE RADIO SYSTEMS BASED ON WATER FILLING
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Abstract:The water filling algorithm provides solution with the help of channel state information. MIMO is a promising high data rate integrates technology. It is well known the aptitude of MIMO can be significantly enhanced by employing a proper power budget

Multi Input Multi Output (MIMO) Multiband OFDM
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Abstract: Ever since the human mind gave birth to technology, adopted it and dedicated itself to enhance it for human ease, the need for an efficient technique that supports accelerated data rates is vital. To add on to the scenario, the spectrum utilization which has reached its

A Low-Complexity Permutation-Based PTS Scheme for PAPR Reduction in OFDM Systems
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Abstract:The high peak-to-average power ratio (PAPR) of the transmitted signal is one of the main drawbacks of orthogonal frequency division multiplexing (OFDM) systems. Partial transmit sequences (PTS) is a non-distortion technique to reduce the PAPR of OFDM

Scrambled Voice Frequency Signal Transmission in an Amplify and Forward Relaying Based STBC Encoded Cooperative MIMO-OFDM System.
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Abstract In this paper, a comprehensive study has been made on performance assessment of a single relayed cooperative wireless communication system under implementation of OFDM aided MIMO technology. This paper provides a new insight on system performance

Reduction of PAPR in OFDM Transceiver system for Next Generation Communication systems
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Abstract:This paper offers a physical layer architecture for SDR (Software Defined radio) with OFDM (Orthogonal frequency division Multiplexing) modulation technique. The modulation and demodulation in the transceiver system is implemented on a partial

Performance Analysis of p/4 DQPSK for FrFT-OFDM System with Carrier Frequency Offset
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Abstract: The Orthogonal Frequency Division Multiplexing (OFDM) has widely been used in broadband wireless communication due to its ability to efficiently utilize the spectrum with multicarrier communication. In this paper BER expression for p/4 DQPSK modulation has

DFT Based Channel Estimation Analysis in OFDM Supported Wireless Communication system.
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Abstract Time-varying channel estimation is an important activity in next generation wireless communication. Channel estimation is required mainly for the significant signal processing operation in multiple input multiple output (MIMO)-orthogonal frequency division

Study on OFDM Symbol Timing Synchronization Algorithm
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Abstract OFDM technology has become the core technology of the next generation mobile communication system because of the high bandwidth efficiency, the strong ability to resist inter-carrier interference and anti-channel interference. However, because OFDM system

An Improved Algorithm of Successive Interference Cancellation for STC-OFDM Systems
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Abstract: STC-OFDM systems effectively overcome the disadvantage of inter symbol interference and frequency selective fading for Orthogonal Frequency Division Multiplexing communication systems, however, there are still some issues, such as how to suppressing

Performance Analysis of VBLAST Based MIMO OFDM System in Vehicular Channel
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Abstract:Vehicular communication is emerging as an important ingredient for successful implement of Intelligent Transportation Systems (ITS). But the development of suitable communications systems plays an important role in mobility condition. The desired system

High-speed Downhole Transmission System and Its Synchronization Algorithm Based on Optical OFDM.
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Abstract:To overcome the shortcomings of low transmission rate due to limited bandwidth in traditional wired transmission, this paper proposes a wireless downhole transmission system based on optical OFDM technique. This system is advantageous in both optical

BER Analysis of Various Channel Equalization Schemes of a QO-STBC Encoded OFDMbased MIMO CDMA System
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(QO-STBC) can provide full-rate transmission and low decoding complexity. This paper deals with channel estimation for Quasi Orthogonal Space Time Block Code (QO-STBC) encoded Orthogonal Frequency Division Multiplexing (OFDM) based Multiple Input

Blind Estimation of Carrier Frequency Offset for OFDM Systems using Maximum Likelihood
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ABSTRACT A Multicarrier Communication system such as an Orthogonal Frequency Division Multiplexing OFDM has been shown to be an impressive approach to combat multipath fading in wireless communications. OFDM is a modulation scheme that allows

PERFORMANCE COMPARISON OF PARTITIONING PTS BASED PAPR REDUCTION OFOFDM SYSTEMS UNDER DIFFERENT MODULATIONS
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ABSTRACT Partial Transmit Sequence (PTS) technique is widely employed to mitigate the peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems without any distortion. The crucial step in any PTS system is partitioning of the

A Review on Various Approaches to Reduce ICI in MIMO OFDM System
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Abstract The vast usage of mobile applications have emerged a need for high speed data transmission and efficient and error free data transmission. For the purpose the use of multiple antenna systems at both the transmitting and receiving end is formulated known

Error Rate Analysis of STBC-OFDM System with Efficient Channel Coding Technique at low SNR
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Abstract With increasing data driven needs in recent times, reliable high data rate wireless communication systems have gained special interest and poised a substantial research challenge. Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (

An Improved Adaptive Iteration Clipping and Tone-Reservation PAPR Reduction with Fast Convergence OFDM.
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Abstract: Orthogonal frequency division multiplexing (OFDM) has been a crucial problem a high peak to average power ratio (PAPR). In all PAPR reduction scheme, Tone reservation (TR) technology is considered as one of the most promising methods, because of no

Introduction to CPM-OFDM: An Energy Efficient Multiple Access Transmission Scheme
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Abstract: In this paper we propose an energy efficient OFDM transmission scheme. Two CPM (continuous phase modulation) schemes are introduced to OFDM, keeping in view the constant envelope and continuous phase changing nature of CPM modulation. Energy

Improving A Wimax-OSTBC Transceiver Based Fourier OFDM In Transmit-Antenna And Path-Correlated Channels Using Tomlinson-Harashima Pre-Coding
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Abstract: IEEE 802.16 d-2004 has been recommended for Worldwide Interoperability for Microwave Access (WiMAX) wireless communication based on Orthogonal Frequency- Division Multiplexing (OFDM) technology and Orthogonal Space-Time Block Code (

PERFORMANCE EVALUATION OF OFDM USING VARIOUS MODULATION TECHNIQUES ON VARIOUS CHANNELS
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Abstract: OFDM is based on parallel data transmission scheme that reduces the effects of multipath fading and renders complex equalizers unnecessary so it is used in wireless LAN (WLAN) systems. Other applications are Asymmetric Digital Subscriber line (ADSL),

MIMO OFDM LTE



Mimo-ofdm for lte, wifi and wimax
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The rationale and structure of this volume is centred around the following story-line . The conception of parallel transmission of data over dispersive channels dates back to the seminal paper of published in 1957, leading to the OFDM philosophy, which

Performance evaluation of linear channel estimation algorithms for MIMO-OFDM in LTE-advanced
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Abstract In this paper two linear channel estimation techniques, Least Square Error (LSE) and Linear Minimum Mean Square Error (LMMSE) along with their modified versions, for reduced complexity, are discussed for LTE-Advanced which is based on MIMO-OFDM

Estimation of highly Selective Channels for Downlink LTE MIMO-OFDM System by a Robust Neural Network.
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Abstract In this contribution, we propose a robust highly selective channel estimator for downlink Long Term Evolution (LTE) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system using neural network. The new method

MIMO-OFDM for a Cellular Deployment-Concepts, Real-Time Implementation and Measurements towards 3GPP-LTE
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ABSTRACT In this paper we report on the system design and a real time implementation of a MIMO-OFDM radio transmission system close to physical layer parameters as discussed in standardization for 3GPP-Long-Term-Evolution. We describe the implementation concept

Role of Contributing Factors MIMO-OFDM in 4G-LTE Wireless Transmission Technologies from Technical Perspective
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Abstract: This paper studies the role of MIMO-OFDM as foremost contributing performance factors in 4G LTE Wireless Transmission Technology from a technical perspective. Long Term Evolution (LTE) uses Orthogonal Frequency Division Multiplexing (OFDM) along

A Review MIMO-OFDM Systems for LTE Environment
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ABSTRACT: This paper nowadays, the requirements in terms of communication are increasing exponentially and getting more diverse. The transmission data rates must be high while maintaining very good quality of service (QoS) despite the very hostile propagation

Performance Analysis of MIMO-OFDM Systems on Coexistence Environment in FDD-LTENetworks
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Output (MIMO) systems has recently drawn wide interests due to their capability of high data rate and wide variety of applications. Recent advances in Long Term Evolution (LTE) communication systems have contributed to the design of multi-user scenarios with MIMO

Symbol Generation and Enhanced Capacity in LTE-A Network using MIMO-OFDM
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Abstract:The development of networks is running toward wireless systems. To attach more services to the handy devices, the demand of more bandwidth as well as better data rate in wireless systems are hiking. Even in developing countries, this demand is increasing.

Advanced Techniques in MIMO-OFDM Systems for LTE Environment
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ABSTRACT: In this paper spatial multiplexing-MIMO communication schemes with OFDM modulation are considered with a focus on 4x4 systems. In order to achieve the 3GPP LTE and 3GPP LTE-A requirements, the design of detector's architecture with high



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