Codeword design for ultra-wideband (UWB) precoding

Authors:
Yu-Hao Chang;Shang-Ho Tsai;Xiaoli Yu;C.-C. Jay Kuo
Affiliations:
MediaTek Inc., Hsinchu, Taiwan, R.O.C.;Department of Electrical Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.;Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA;Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

A precoding technique applied to symbols transmitted in an ultra-wideband (UWB) system can concentrate the signal power at the receiver for a higher data detection rate. The codeword design problem for optimal UWB precoding is investigated in this work. After the problem formulation, we examine its solution in the full-rank and the reduced-rank subspaces to obtain different tradeoffs between the detection performance and the amount of feedback messages. Furthermore, we propose two subspace selection schemes, each of which corresponds to a code design method. The resultant optimal codewords improve the performance of previous work significantly at the expense of a slightly increased amount of feedback messages. Finally, the performance of a precoded UWB system with various codewords is compared via computer simulation.