采用峰均比抑制的MC-CDMA系统研究  

Study on Multi-Carrier CDMA System with PAPR Reduction in Power Line Communication

作　　者：胡茂凯[1] 陈西宏[1] 黄荣华[2] 

机构地区：[1]空军工程大学防空反导学院 [2]中国人民解放军第95100部队

出　　处：《电测与仪表》2013年第6期14-19,共6页Electrical Measurement & Instrumentation

摘　　要：多载波码分多址(MC-CDMA)是电力线通信领域最具应用前景的方案之一,但系统的高峰均功率比(PAPR)大大限制了它的应用,文中研究采用部分传输序列(PTS)方法来降低MC-CDMA系统的PAPR。针对PTS方法计算量随分割子块数呈指数增加的问题,采用粒子群算法(PSO)优良的迭代寻优能力,将高维搜索问题转化为粒子群迭代寻优过程,从而用很小的复杂度获得了具有较小峰均功率比的信号。对基于该算法的MC-CDMA系统PAPR性能以及系统在电力线信道和非线性功率放大器作用下的系统误码率进行了仿真,结果表明:与PTS方法相比,PSO-PTS的PAPR抑制能力有微小的性能损失,但具有很低的复杂度,在采用非线性功放的电力线信道下的误码率性能与最优PTS算法相近。The high peak-to-average power ratio（PAPR）characteristics restrict its application as multi-carrier code division multiple access（MC-CDMA）is an attractive scheme for Power Line Communication（PLC）.So this paper focuses on reducing the high PAPR by using Partial Transmitted Sequences（PTS）method,and the complexity of which increases exponentially with the number of partitioned subblock.To reduce the high complexity,particle swarm optimization（PSO）is introduced for seeking the optimum phase coefficients.The high-dimensional searching process is then transformed to iteration process.Simulations results show that,compared with PTS,the PSO-PTS has slight performance loss in reducing PAPR which has very low computational complexity.Meanwhile,the bit error ratio（BER） performance for PSO-PTS scheme are close with traditional PTS method under the power line channel with the use of nonlinear high-power amplier（HPA）.

关 键 词：电力线通信 多载波CDMA 峰均功率比 部分传输序列 粒子群优化 误比特率 

分 类 号：TM73[电气工程—电力系统及自动化] TN911[电子电信—通信与信息系统]