摘要
MIMO信道容量下降的主要原因是发射天线发出的信号在接收端形成的空间特征相似度太大造成的。有选择除去一些空间特征太为相似的天线能够有效的提高信道容量。为此本文提出了一种综合评估准则:波束形成矢量的范数。仿真结果表明,在发射天线总数相同的条件下,基于本文方法的选择效果逼近最大容量的选择效果。在自适应链路的实现中,发射天线的个数由接收性能最差信道的信噪比确定,能够保证在当时通信环境下最大的空间复用系数。
The main reason of the Multiple - Input Multiple - Output （MIMO） channel capacity de- scending is the too much spatial feature similarity from transmit antenna to the receiving end. Re- moval some antennas with very similar spatial feature can improve the channel capacity effectively. This paper presents a comprehensive evaluation criteria： beamforming vector norm, The simulation results show that, in the same condition of the transmit antenna number, the selection effect based on this paper is a very close approximation to the effect of maximum capacity. In the implementation of adaptive link, the number of transmit antenna is determined by the signal - to - noise ratio of the performance of the worst channel, to ensure the largest spatial multiplexing factor in communicationenvironment of the time.
出处
《无线通信技术》
2014年第1期10-13,23,共5页
Wireless Communication Technology
