Adaptive Baseband Compensation for I/Q Imbalance and Time-Varying Channel in OFDM System
This paper proposes adaptive baseband compensation method for the OFDM system in the presence of I/Q imbalance of receiver front-end, and Doppler effect of time-varying channel. A paired-tones model is built up for the applications of two adaptive equalizers - the RLS and NLMS. Special scattered pilot tones in V-pattern are used in conjunction with the adaptive algorithms. The impact of Doppler frequency on the receiver performance is studied through computer simulation