OFDM and MIMO OFDM Systems

Joint Estimation of Impairments for OFDM and MIMO OFDM Systems

FREE-DOWNLOAD T Shankar, A Karthikeyan… – International Journal of …, 2011 – ijcaonline.org
Orthogonal Frequency Division Multiplexing (OFDM) is a multi–channel modulation technique that makes use of Frequency division multiplexing (FDM) being modulated by a low bit rate digital stream. The main reason of using OFDM is because here the symbol detection is easy and also to increase the robustness against frequency selective fading and narrow band interference. Certain parameter like CFO (carrier frequency offset),I/Q imbalance (inphase and quadrature phase imbalance) imbalance causes distortion in the received signal. Here comparison is made for the given parameters using different channels and a method is proposed for Multiple Input Multiple output (MIMO) OFDM system when symbol generated is not a integral multiple of number of transmitters used.