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

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 ≌3 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.