An improved frequency offset estimation algorithm by multi-band averaging method for MB-OFDM based UWB communication for WPAN applications

摘要

We present a fast converging scheme for estimating coarse frequency offset (FO) in multi-band orthogonal frequency division multiplexing (MB-OFDM) based ultra-wideband (UWB) systems for wireless personal area network (WPAN). Our estimator performs an averaging of initial estimate over multiple bands and shows an improved estimation of cong3 times in terms of estimation error variance for band group 1 compared to our earlier proposed scheme [3]. Cramer Rao lower bound (CRLB) of estimation error and bit-error rate (BER) performances with our estimator, multi-band averaged frequency synchronizer (MBAFS), is studied and compared with [3] for 100,000 noisy realizations in UWB channel models (CM), CM1 and CM3. Also, computational complexity of MBAFS is analyzed for its usability evaluation.