降低OFDM系统峰均功率比的时频联合块交织方法  

Time-frequency block interleaving schemes for PAPR reduction in OFDM systems

作　　者：王灵垠[1] 刘琚[2] 

机构地区：[1]济南大学信息科学与工程学院,山东济南250022 [2]山东大学信息科学与工程学院,山东济南250100

出　　处：《山东大学学报（理学版）》2012年第11期83-87,共5页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(60872024);教育部科技创新工程重大项目培育资金资助项目(708059);山东大学自主创新基金资助项目(2010JC007);东南大学移动通信国家重点实验室开放基金资助项目(2010D10);山东省自然科学基金资助项目(ZR2011FM027)

摘　　要：由于传统块交织方法是对单个正交频分复用(orthogonal frequency division multiplex,OFDM)信号进行块交织,所产生的候选信号间存在很大的相关性,在一定程度上影响了系统峰均功率比(peak-to-average power ratio,PAPR)性能的改善。针对传统块交织方法的这一局限性,提出了降低OFDM系统PAPR的时频联合块交织方法及其次优化方法。该方法将块交织扩展到一个时间片内的多个OFDM信号之间,增加了产生候选信号的自由度,降低了候选信号间的相关性。仿真结果表明,与传统块交织方法相比,在计算复杂度相同的情况下,所提出的时频联合块交织方法可以获得更优的PAPR性能。As for one orthogonal frequency division multiplex （OFDM） signal, conventional block interleaving is implemented, but the correlation between two generated candidate signals is very strong, which degrades the improvement in peak-to-average power ratio （PAPR） reduction performance. Concerned on the limitation of conventional block inter- leaving, a time-frequency block interleaving scheme and its suboptimal scheme for PAPR reduction in OFDM systems were proposed. In proposed schemes, block interleaving was adopted among different OFDM signals in a timeslot, which improves the freedom of generating candidate signals and reduces the correlation between two different candidate signals. The simulation results show that, compared with conventional block interleaving, this schemes can obtain better PAPR reduction performance with the same computational complexity.

关 键 词：正交频分复用 峰均功率比 块交织 时频联合 相关系数 

分 类 号：TN914[电子电信—通信与信息系统]