MIMO认知无线电系统中协作频谱共享方案

Cooperative spectrum sharing scheme for MIMO cognitive radio system

针对一对主用户收发链路和一对次用户收发链路构成的多输入多输出(MIMO)认知无线电系统,为有效提高主用户和次用户的系统容量,提出了一种基于线性预编码设计的协作频谱共享方案,其中主用户出让一半的传输时间,而次用户则通过协作中继方式与主用户共享频谱,并给出了相应的主、次用户的预编码矩阵的联合设计。仿真结果表明,与传统机会频谱共享方案相比,协作频谱共享方案可以显著提高主用户和次用户的系统性能。

Considering a multiple-input-multiple-output （MIMO） cognitive radio （CR） system consisting of a primary transmitter-receiver pair,and a secondary base station-receiver pair,to improve the system capacity of the primary user （PU） and secondary user （SU）,this paper proposed a cooperative spectrum sharing scheme based on linear precoding design,in which the PU leases half of its transmission slot to the SU in exchange for the SU cooperatively relaying the PU＇ s data and the corresponding precoding matrices are jointly optimized.Simulation results show that compared to conventional opportunistic spectrum sharing scheme,it proposed the cooperative spectrum sharing scheme can effectively enhance the system performance of both PU and SU.