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Based on the analysis of the effect of the channel estimation error on the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems, a novel noise reduction algorithm for the LS channel estimation is presented for OFDM systems with virtual carriers in frequency-selective fading channels. In the method, the estimated channel vector by the LS algorithm is further processed by the Q matrix...
Similar to the conventional orthogonal frequencydivision multiplexing (OFDM) system, an OFDM multiple access (OFDMA) system will have a carrier frequency offset (CFO) problem. Since CFOs of all users are different, CFO compensation in the OFDMA uplink system is much more involved. A simple, yet efficient, method is the zero-forcing (ZF) compensation method. However, it involves an inverse of an Ntimes...
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