窄带波束信道MIMO系统的容量分析

最近的研究表明,多输入多输出(MIMO)技术在不增加功率和带宽消耗的情况下具有大幅提高无线通信速率的潜力.在传统的MIMO系统(称为天线信道MIMO系统)中,多个接收天线的输出被直接选作多输出信号.提出了波束信道MIMO系统的结构.在波束信道MIMO系统中,多个波束的输出被选作多输出信号.基于阵列方向响应矢量,提出了窄带MIMO信道冲激响应矩阵的仿真算法.基于提出的信道冲激响应矩阵算法,给出了天线信道MIMO系统和波束信道MIMO系统容量极限的分析算法.理论分析和仿真结果都表明:波束信道能够提高信噪比(SNR),降低信道间的互相关性,因此波束信道MIMO系统比天线信道MIMO系统具有更大的容量极限.

On the Capacity of Narrowband Beam-Channel MIMO Systems

Recent studies have been shown that multiple-input multiple-output(MIMO) techniques have the potential to drastically increase the data rate of wireless communications with no additional power or bandwidth consumption.In a conventional MIMO system that is refered to as the antenna-channel MIMO system,the outputs from receive antennas are selected directly as the multiple-output signals.The structure of the beam-channel MIMO system is proposed.In a beam-channel MIMO system,the outputs from multiple beams are selected as the multiple-output signals.Based on the directional array response vector,the simulation algorithm on the impulse response matrix of the narrowband MIMO channels is proposed.On the proposed algorithm of the channel impulse response matrix,the analysis algorithms on the capacity limits of the antenna-channel MIMO system and the beam-channel MIMO system are presented.Both theoretical analyses and simulation results indicate that: beam channels can increase signal to noise ratio(SNR),mitigate cross-correlation properties among channels,consequently,the beam-channel MIMO system has a bigger capacity limit than that of the antenna-channel MIMO system.