为了减少反馈信息,提出了适用于正交空间复用(OSM)系统的相位旋转预编码(PR—OSM),该预编码可使调制信号的虚部分量旋转适当的角度.与OSM系统的功率分配预编码(PL-OSM)相比,新方案减少了反馈信息,且降低了获得预编码参数的计算量.仿真结果表明,当可靠性相同时,新方案比PL—OSM节约了4bit的反馈信息.
To decrease feedback overhead, a phase rotation precoding for orthogonalized spatial multiplexing (PR-OSM) system is proposed, in which a proper rotation is set at the imaginary part of modulated signals. Compared with the power allocation precoding of OSM (PL-OSM) , the feedback information of this scheme is decreased and the complexity of calculating precoding parameter is also reduced. Simulation results show that with the same reliability of PL-OSM, the proposed scheme saves four bits feedback overhead.