不理想的信道互易性对波束成形技术的影响…

在无线通信系统中,基站可以根据信道互易性使用波束成形(Beam Forming)技术提升系统性能。信道互易性的准确程度对性能是有影响的,因此需要对其分析以指导系统设计。对长期演进(LTE)系统的互易性进行建模,指出了终端发送天线和接收天线数目的不对称性,以及基站信道估计的误差对信道互易性的影响。通过数值仿真验证了不理想的信道互易性使波束成形性能受到损失,并为系统改进提出思路。其结论容易推广到其他应用波束成形的无线通信系统。

Impact of non-ideal channel reciprocity on beam forming

In wireless communication systems, the base station can use beam forming to improve performance based on channel reciprocity. The performance depends on accuracy of channel reciprocity, which should be analyzed so as to guide system design. This paper models the channel reciprocity in LTE(Long Term Evolution) systems ,and then points out that the mis match between the transmitter and receiver an tenna number of the user equipment and the channel estimation error at the base stati on can make the channel reciprocity non ideal. Simulation verifies that the performance of the beam forming is degraded by the non ideal channel reciprocit y. Ideas to improve system performance are proposed. The conclusi ons are easily applied for other wireless communication systems with beam forming.