摘要
利用先进的长期演进系统中8天线预编码2级码本结构,提出了分步反馈长时预编码矩阵指示符和短时预编码矩阵指示符的码字选择算法.接收端根据信道容量近似解的最大值计算反馈长时预编码矩阵指示符,然后通过遍历方法确定短时预编码矩阵指示符的反馈值.该方法能提高反馈的有效性,降低计算复杂度.仿真结果表明,分步反馈预编码码字选择算法的性能比最优码字选择算法相差约0.2 dB.
Based on an eight antenna double codebook in long term evolution advanced system, the codebook selection strategy is proposed by feedback long term precoding matrix index and short term precoding matrix index separately. The long term precoding matrix indexis calculated by approximating channel capacity and the short term precoding matrix indexis searched by maximizing channel capacities. Simulation shows that the feedback overload and computational complexity are dramatically reduced performance degradation with only about 0. 2 dB compared with the optimal codebook selection scheme.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2014年第2期84-87,共4页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(61271178)
中央高校基本科研业务费资助项目(BUPT2012RC0101)
关键词
先进的长期演进
多输入多输出
预编码
码字选择
long term evolution advanced
multi-input multi-output
precoding
codebook selection
