降低MIMO-OFDM系统峰均比的改进PTS算法  

Improved PTS Algorithm for Reducing the PAPR of MIMO-OFDM System

作　　者：张仁烨 白恩健[2] 

机构地区：[1]东华大学信息科学与技术学院,上海201620 [2]东华大学数字化纺织服装技术教育部工程研究中心,上海201620

出　　处：《电子科技》2014年第12期1-4,共4页Electronic Science and Technology

基　　金：国家自然科学基金资助项目(61201249);上海市自然科学基金资助项(10zr1401400)

摘　　要：多输入多输出频分复用技术是将OFDM与MIMO技术相结合的无线通信系统,也具有OFDM系统存在的峰均比较高的问题。分析了MIMO-OFDM系统模型及PAPR问题,在次优PTS算法的基础上,提出了迭代限幅PTS联合算法。该算法先将MIMO-OFDM信号经过迭代PTS算法进行处理,然后再将其经过限幅处理进一步降低系统的PAPR。最后在自适应PTS算法的基础上进行了改进,仿真结果表明系统复杂度和PAPR性能有所降低,但可以通过调整门限来提高性能。Multiple input multiple output frequency division multiplexing technology is a wireless communica- tion system combing OFDM and MIMO technology. The system also has the problem of high PAPR. This paper ana- lyzes the model and the PAPR of MIMO-OFDM system, and proposes an iterative clipping PTS algorithm based on the suboptimal PTS algorithms. The algorithm first converts the MIMO-OFDM signal by iterative PTS algorithm for processing and then further reduces the system PAPR through the clipping process. Finally an improved method based on adaptive PTS algorithm is proposed. The simulation results show that the complexity of the system is de- creased and the performance of PAPR is reduced, but the performance can be improved by adjusting the threshold.

关 键 词：多输入多输出频分复用 峰均比 分组传输序列 

分 类 号：TN929.537[电子电信—通信与信息系统]