A Low Complexity Timing Estimation Scheme for Multi-Band OFDM Based Ultra-Wideband System

In this paper, a low-complexity correlation based symbol timing synchronization (CBTS) algorithm for UWB MB- OFDM systems is presented. The scheme attempts to locate the start of the fast Fourier transformation (FFT) window during frame synchronization (FS) sequence of the received preamble by identifying the first significant multi-path component with the help of a predefined threshold. The algorithm is tested by computer simulation over UWB channel models (CM), CM1 and CM2 as suggested by IEEE 802.15 channel modeling subcommittee. Performance of the proposed algorithm is measured through mean-squared error (MSE) of timing estimation and probability of synchronization. Each of the UWB CM environments is simulated for 100,000 noisy channel realizations for different signal-to-noise ratio (SNR) e.g. 17 dB, 10 dB, and 5 dB. Synchronization probabilities at 17 dB SNR reach maximum of '94.63%' for CM1, and '80.23%' for CM2, for 320 Mbps data rate.