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本文提出一种新的基于正交空时分组码的非酉的线性预编码优化方案.针对正交空时分组码的特殊结构,从特征空间角度深入研究,进一步发掘信号传输潜力,证明了新提出的理论优化设计相较于过去方案的优势.在传统的酉的基于弦距离的Grassmann码本设计基础上,对预编码码本进行非酉化改进,在有限反馈的意义下实现综合性能的进一步提升.同时,给出并论证了该方法保证系统满分集时对码本大小的约束条件.另外,为了降低天线空间相关性对系统性能带来的恶化影响,在前面的研究基础上,提出一种融合“注水”的预编码码本生成方法.该方案的综合性能优势在仿真中得以验证.
In this paper, a new non-unitary linear precoding optimization scheme based on Orthogonal Space-Time Block Code is proposed. For the special structure of Orthogonal Space-Time Block Code, further research is conducted from the perspective of feature space to further explore the potential of signal transmission, Based on the traditional unitary string-distance-based Grassmann codebook design, the pre-codebook is non-unitized to improve the performance of the theoretical optimization design in the sense of limited feedback The constraints on the size of the codebook when the system is fully distributed are also given and demonstrated.In addition, in order to reduce the deterioration of the system performance caused by the antenna spatial correlation, based on the previous research, A Method of Generating Pre-coded Codebook with “Water Injection” The comprehensive performance advantage of this scheme is verified in simulation.