基于时分复用的认知MIMO系统的干扰消除算法

The interference elimination algorithm based on time division multiplexing for cognitive MIMO system

在认知MIMO通信系统中,认知用户伺机接入到主用户的频谱中,在传输过程中认知用户对主用户以及认知用户之间都会产生很大的干扰.为了消除认知用户之间的干扰,提出基于时分复用的干扰消除算法.该算法旨在认知系统中对认知用户传输的整个时间段进行划分,在保证认知系统吞吐量最大的情况下,得到每个认知用户的传输时间段,然后在对应的传输时间下进行此认知用户的通信,此时只有单个认知用户进行通信,避免受到其他认知用户的干扰.仿真结果表明,在信噪比小于6 d B时,采用所提算法下,单位带宽认知系统可以增加0.5bit/s的吞吐量,同时能源效率平均提高了1.2 bit·s-1·w-1.

In cognitive MIMO system,cognitive users communicate by opportunistically accessing the spectrum of primary user. In the process of transmission,cognitive users to primary users and other cognitive users will produce big interference. In order to eliminate the interference between cognitive users,this paper puts forward the interference elimination algorithm based on time division multiplexing. The simulation results show that when the SNR is less than 6 d B,under the unit bandwidth,the throughput of cognitive system adopting the proposed algorithm in this paper can increase 0. 5 bit / s,at the same time,the average energy efficiency increased 1. 2 bit·s- 1·w- 1.