CAJ | 학술논문

　　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。
　　다재파마분다지（MC-CDMA）시전력선통신영역최구응용전경적방안지일，단계통적고봉균공솔비（PAPR）대대한제료타적응용，문중연구채용부분전수서렬（PTS）방법래강저MC-CDMA계통적PAPR。침대PTS방법계산량수분할자괴수정지수증가적문제，채용입자군산법（PSO）우량적질대심우능력，장고유수색문제전화위입자군질대심우과정，종이용흔소적복잡도획득료구유교소봉균공솔비적신호。대기우해산법적MC-CDMA계통PAPR성능이급계통재전력선신도화비선성공솔방대기작용하적계통오마솔진행료방진，결과표명：여PTS방법상비，PSO-PTS적PAPR억제능력유미소적성능손실，단구유흔저적복잡도，재채용비선성공방적전력선신도하적오마솔성능여최우PTS산법상근。
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).