降低MC-CDMA系统峰均功率比的方法

Method for Reducing Peak Average Power Ratio of MC-CDMA System

多载波码分多址(MC-CDMA)作为OFDM和扩频通信技术的相结合后的一种新技术,被认为是无线移动通信中最有潜力的后选方案之一,尤其在数据的高速传输中具有较大的优势。但作为一种多载波通信,其最大的缺点之一就是信号具有较高的峰均功率比(PAPR)。针对其PAPR过高的问题,在原本选择映射(SLM)的基础上进行了适当的改进,在传统SLM的基础上加入扰码序列作为相位序列的自适应选择复用帧数的算法。Matlab仿真结果表明该方法可有效地减小信号的PAPR且同时具有较低的系统复杂度。

Multi carrier code division multiple access （ MC - CDMA） is a new technology as a combination of OFDM and Spread -Spectrum Communication Technology. It is considered to be the most promising one of the selection schemes in wireless mobile communication, especially with great advantages in the high - speed transmission of data. But as one of the multi carrier communications, one of its biggest disadvantages is that the signal has high peak to average power ratio （PAPR）. Aimed at the problem of high PAPR, an appropriate improvement is described on the originally selected mapping （ SLM ） basement, combined with adaptive phase sequence selection algorithm for muhiplexing frames. Furthermore, the algorithm has joined the scrambling se- quence based on the traditional SLM. At length, Matlab simulation results show that the proposed method can effectively reduce the signal PAPR with low system complexity.