存在反馈延迟时V-BLAST系统的功率分配算法

发布时间：2018-04-11 22:27

本文选题：V-BLAST + 反馈延迟　；参考：《电波科学学报》2014年06期

【摘要】：针对信道反馈有延迟条件下的垂直贝尔实验室分层空时(Vertical Bell Laboratories Layered Space Time,V-BLAST)系统,提出基于最小均方误差检测(Minimize Mean Square Error,MMSE)的自适应功率分配算法.通过系统建模和性能分析,推导出系统瞬时信干噪比的条件概率密度函数,并得到V-BLAST系统的平均BER表达式.发送端在总功率约束条件下,以瞬时BER为优化目标,利用拉格朗日极值法求解自适应功率分配矩阵.仿真结果表明,在信道反馈有延迟时,与等功率分配相比,采用所提算法可显著改善系统的BER性能.
[Abstract]:For the Vertical Bell Laboratories Layered Space time V-BAST system with channel feedback with delay, an adaptive power allocation algorithm based on minimum mean square error detection (MMSE) and minimum mean square error detection (MMSE) is proposed.Based on system modeling and performance analysis, the conditional probability density function of the instantaneous signal-to-noise ratio of the system is derived, and the average BER expression of the V-BLAST system is obtained.Under the condition of total power constraint, the transmitter uses the Lagrange extremum method to solve the adaptive power allocation matrix with the instantaneous BER as the optimization target.The simulation results show that the proposed algorithm can significantly improve the BER performance of the system compared with the equal-power allocation when the channel feedback has delay.
【作者单位】：南京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金面上项目(No.61172078) 中国博士后科学基金(2013M541661) 航空科学基金(20120152001)
【分类号】：TN919.3

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