An Energy Based Symbol Timing Synchronization Scheme for MB-OFDM Based Ultra-Wideband Communication

An ultra-wideband channel is expected to exhibit different delay characteristics in different bands. In this work, wideband channel delay characteristics are studied and delay parameters are found considerably different over frequency bands 3.1-4.6 GHz. Based on this observation, an adaptive timing synchronization scheme (ATS) which estimates and maintains the timing delays of each band separately is proposed. The performance of ultra-wideband (UWB) Multi-band OFDM (MB- OFDM) system with ATS algorithm is studied through computer simulations. It is shown that ATS gives signal-to-noise ratio (SNR) improvement of 1.7 dB at bit error rate (BER) of 2times10
^-2
, 2.2 dB at BER of 7x10
^-3
, and 1.1 dB at BER of 5x10
^-3
for CM4, CM3, and CM2 respectively for uncoded MB-OFDM system over a non-adaptive synchronization scheme [C.W. Yak et al., 2005].