线性接收机方案下的分层码本有限反馈预编码

该文分析了线性接收机方案下传统Grassmann码本的性能缺失，并通过分析酉阵扰动对系统误码率及信道容量性能的影响，建立应用于多天线系统线性接收机方案下的由Grassmann主码本与酉阵扰动子码本共同构成的分层码本体系，与之对应的是两步码字选择准则。对于子码本的建立，该文提出了基于旋转矩阵和基于householder变换两种方案，并通过计算机仿真阐释了分层码本体系对于传统单码本预编码在系统误码率及信道容量等方面的性能优势。

Limited Feedback Precoding System Based on Hierarchical Codebook with Linear Receiver

The performance loss of conventional Grassmannian codebook is analyzed. According to the analysis of unitary perturbation’s effects on channel capacity as well as the BER, a novel hierarchical codebook consisting of a Grassmannian main-codebook and a perturbation subcodebook proposed for multi-antenna systems with linear receivers is established, and corresponds with the two-step codeword selection scheme that uses the product of two codewords respectively selected from the main-codebook and the sub one as the ultimate precoder. Specifically to the design of subcodebook, two schemes is brought forward: rotation-based and householder transformation-based, and the superiority of the proposed codebook in terms of both the channel capacity and BER is further confirmed by computer simulations.