采用压缩感知的协作多点信道反馈算法研究

Study on Channel Feedback Algorithm Using Compressed Sensing for Coordinated Multiple Point

协作多点技术(Coordinated Multiple Points,CoMP)作为LTE-A的最重要候选技术之一,已经得到广泛的关注。在协作多点中,有很多种传输方案,其中一种基于联合传输下的全局预编码方案能够获得极佳的系统性能,而实现该方案的前提是基站可以得到较为完整的信道状态信息。因此在信道反馈时选择显式反馈,因为相比较其他反馈方式,它可以反馈更为完整的信道状态信息,而显式反馈的缺点为需要的反馈量过大。文中利用一种采用压缩感知的信道反馈新方法对联合传输下的全局预编码方案信道显式反馈信息进行压缩,仿真结果显示在不影响系统性能的前提下,能够有效地减少反馈量,使得系统发挥最佳性能。

Coordinated Multi Point （ CoMP） technology has drawn broad attention as one of the most important potential technologies of LTE-A. There are a variety of transmission schemes of CoMP,one of which is the global precoding scheme based on joint transmission can obtain excellent system performance. The realization of the program is based on the fact that the base station can get a more complete channel state information. Therefore,explicit feedback is chosen as the channel feedback method because compared with other feedback ways,the explicit feedback can feed more complete channel state information,but the disadvantage of the program is that it requires exces-sive feedback. In this paper,a novel channel feedback method of compressed sensing is utilized to compress the explicit channel feedback information of global precoding scheme under joint transmission. Simulation results show that on the premise of without affecting system performance,it can effectively reduce the amount of feedback,making the system work optimally.