A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access

作     者：Si-Si Liu Yue Xiao Qing-Song Wen Shao-Qian Li 

作者机构：National Key Lab of Communications University of Electronic Science and Technology of China （UESTC） Chengdu 610054 China 

出 版 物：《Journal of Electronic Science and Technology of China》 (中国电子科技（英文版）)

年 卷 期：2007年第5卷第2期

页      面：102-106页

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

主　　题：Low complexity variable code sets,multicarrier code division multiple access (MC-CDMA),peak to average power ratio variable code sets. 

摘      要：This paper investigates a peak to average power ratio （PAPR） reduction method in multicarrier code division multiple access （MC-CDMA） system. Variable code sets （VCS）, a spreading codes selection scheme, can improve the PAPR property of the MC-CDMA signals, but this technique requires an exhaustive search over the combinations of spreading code sets. It is observed that when the number of active users increases, the search complexity will increase exponentially. Based on this fact, we propose a low complexity VCS （LC-VCS） method to reduce the computational complexity. The basic idea of LC-VCS is to derive new signals using the relationship between candidature signals. Simulation results show that the proposed approach can reduce PAPR with lower comtational pucomplexity. In addition, it can be blindly received without any side information.