论文部分内容阅读
针对多用户配对虚拟MIMO(multiple input multiple output)安全性差、对信道估计器依赖性强的问题,在分析理想MIMO系统和多径SISO(single input single output)系统本质关系的基础上,提出一种基于空时分组编码STBC(space-time block coding)和正交频分复用(orthogonal frequency division multiplexing,OFDM)的非协作式虚拟MIMO传输策略.在发送端,为了获得最佳发射分集增益,利用信道循环矩阵奇异值分解(singular value decomposition,SVD)后得到的左酉矩阵进行预编码;在接收端,为了获得平行子信道传输效果,提出一种基于低复杂度线性STBC译码和傅里叶变换预解码的非协作虚拟MIMO接收方案.该虚拟MIMO在收发两端均无需信道瞬时信息,以非协作方式在单天线内模拟多天线收发效果.仿真分析结果表明该虚拟MIMO系统能有效逼近实际理想MIMO的系统容量和误比特率性能,显著降低了虚拟MIMO系统的检测门限.该结果验证了其有效性和优越性.
Aiming at the problem of multiple input multiple output (MIMO) poor security and strong dependence on channel estimator, aiming at the analysis of the essential relationship between ideal MIMO system and multipath SISO (single input single output) system, A non-cooperative virtual MIMO transmission strategy based on space-time block coding (STBC) and orthogonal frequency division multiplexing (OFDM) is proposed. At the transmitting end, in order to obtain the best transmit diversity gain, In the receiver, in order to obtain the effect of parallel subchannel transmission, a novel method based on low complexity linear STBC decoding and Fourier transform Transform the pre-decoding non-cooperative virtual MIMO receiving scheme.This virtual MIMO does not need channel instantaneous information at both the receiving and transmitting ends, and simulates the multi-antenna transceiving effect in a single antenna in a non-cooperative manner.The simulation results show that the virtual MIMO system can effectively approach the actual The ideal MIMO system capacity and bit error rate performance significantly reduce the detection threshold of the virtual MIMO system. Its effectiveness and superiority.