Title :
Codeword design for ultra-wideband (UWB) precoding
Author :
Chang, Yu-Hao ; Tsai, Shang-Ho ; Yu, Xiaoli ; Kuo, C. C Jay
Author_Institution :
MediaTek Inc., Hsinchu, Taiwan
fDate :
1/1/2010 12:00:00 AM
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.
Keywords :
channel coding; precoding; ultra wideband communication; UWB system; channel phase precoding; codeword design; ultra-wideband precoding; Contracts; Councils; Design methodology; Diversity reception; Feedback; Fingers; Intersymbol interference; RAKE receivers; Transmitters; Ultra wideband technology; Ultra-wideband, UWB, precoding; time-reversal prefilter, TRP, pre-Rake, channel phase precoding, CPP;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.01.081397