tailieunhanh - Báo cáo hóa học: " Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications | Hu and Lee EURASIP Journal on Advances in Signal Processing 2011 2011 64 http content 2011 1 64 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications Chia-Chang Hu and Shih-Chang Lee Abstract In this paper an adaptive channel estimation scheme based on the reduced-rank RR Wiener filtering WF technique is proposed for multi-band MB orthogonal frequency division multiplexing OFDM ultra-wideband UWB communication systems in multipath fading channels. This RR-WF-based algorithm employs an adaptive fuzzy-inference-controlled FIC filter rank. Additionally a comparative investigation into various channel estimation schemes is presented as well for MB-OFDM UWB communication systems. As a consequence the FIC RR-WF channel estimation algorithm is capable of producing the bit-error-rate BER performance similar to that of the full-rank WF channel estimator and superior than those of other interpolation-based channel estimation schemes. Keywords channel estimation MB-OFDM ultra-wideband UWB Wiener filter 1. Introduction Ultra-wideband UWB wireless systems have generated considerable interest as an indoor short-distance high-data-rate transmission in wireless communications over the past few years. A number of promising advantages such as low power consumption low cost low complexity noise-like signal resistant to dense multipath and jamming and excellent time-domain resolution have made UWB systems perfectly suitable for personal computing PC consumer electronics CE mobile applications and home entertainment networks. Applications of UWB radio techniques to short-range wireless communications such as sensor networks and wireless personal area networks WPANs are currently being explored 1 . Two competing UWB technologies for physical layer PHY of the WPANs are investigated by the IEEE standards task group TG3a 2 . One is