Channel Estimation Techniques in OFDM Based UWB Wireless Communications

The MB-OFDM UWB systems can capture multi-path energy more efficiently than DS-UWB. Much work has been done on the channel estimation of traditional narrow-band OFDM. However, there are many differences between the channel characteristic of narrow-band and UWB systems. After the analysis of architecture, signal and channel model of MB-OFDM UWB wireless systems, the performance of channel estimation approaches based on preamble training sequences and pilot sub-carriers according to the criterions of LS and MMSE respectively is investigated and compared, under different UWB channel conditions. The characteristic of estimation error changing with the SNR is also discussed. Consequently, the channel estimation techniques for indoor short-range UWB wireless communications are established.