Performance Analysis of Constellation Mapping and Channel Estimation in MB-OFDM UWB Systems
In this paper, we investigate the influence of channel mismatch errors on the performance of multi-band OFDM (MB-OFDM) UWB systems according to different schemes of constellation mapping. The accuracy in the identification of time-invariant channel is limited either by errors in channel estimation or by noise. A model to analyze the effect of these factors is presented, from which the formula for bit error rate (BER) as a function of signal-to-noise ratio (SNR) is derived. We also analyze the channel estimation based on block-type training sequence and comb-type pilots with linear interpolation, as shown by simulation that the combtype estimator with appropriate pilot arrangement can achieve better performance than block-type estimator for the typical UWB indoor channel which exhibits low frequency selectivity relatively.
UWB OFDM constellation mapping channel estimation
Changyi Li Guoxin Zheng Min Wang
Department of Communications Engineering,Shanghai University
国际会议
武汉
英文
2006-09-01（万方平台首次上网日期，不代表论文的发表时间）