A New Frequency Offset Estimation Scheme For Ultra-Wideband MB-OFDM Systems

In this paper a frequency offset estimation scheme is presented for coarse frequency offset estimation of multi-band OFDM (MB-OFDM) based ultra-wideband (UWB) systems considering different normalized carrier frequency offsets and different channel frequency responses in three different bands. The Cramer Rao Lower Bound (CRLB) for variance of the estimated frequency offset is derived and compared with the simulated results of the proposed scheme. Performance of the MB-OFDM system in terms of the Bit Error Rate (BER) with suggested frequency offset estimator is reported. The algorithm is tested by computer simulation over 100,000 noisy realizations in each of the UWB channel models (CM), CM1, CM2, CM3, and CM4 as suggested by IEEE 802.15 channel modeling sub-committee.