一种超宽带系统中的多天线加权预处理方案

针对高传输速率超宽带系统中的符号间干扰问题,提出一种新的多天线加权预处理方案.当发射端已知所有子信道的信道状态信息时,通过信道系数翻转即可以获得每个子信道的预处理抽头系数及等效信道.采用基于广义瑞利商方法求得的最优天线加权系数,能够使得在接收端采样处的信干噪比最大化.采用该发射方案,接收端仅需单天线即可实现捕获多径能量和抑制符号间干扰的折中.仿真结果表明:相对简单的天线合并方案,所提方案在4发射天线下能够获得至少2 dB的误码性能提升.

A Pre-Processing Scheme with Multiple-Antenna Weighting in Ultra-Wideband System

A new multiple-antenna weighting scheme is proposed to improve the problem of inter-symbol-interference suppression in high data-rate UWB systems.When the transmitter knows the full channel state information of each sub-channel,the coefficients of the pre-processing fingers of each antenna and equivalent channel responses are obtained through channel coefficients reversal.Therefore,the final equivalent channel impulse response at the receiver is determined by the multiple-antenna weighting coefficients.The ratio of the received signal to interference-noise can be maximized in the sampled peak using the generalized Rayleigh quotient method.When the proposed scheme is used,only one antenna is needed at the receiver to obtain a trade-off between the multi-path energy capture and the ISI suppression.Simulation results and comparisons with the simple antenna combining scheme show that the proposed scheme achieves at least 2 dB BER performance improvement in a system with four transmit antennas.