时变SC-FDMA调制系统  

Time-varying single carrier frequency division multiple access modulation system

作　　者：蒋漓[1] 王光宇[1] 周瑜[1] 

机构地区：[1]重庆邮电大学移动通信技术重庆市重点实验室

出　　处：《重庆邮电大学学报（自然科学版）》2014年第3期358-361,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(61071195);中芬国际合作项目(1018)~~

摘　　要：针对目前降低通信调制系统峰值平均功率比(peak-to-average-power ratio,PAPR)的方法都基于固定数据块长度的情况,提出时变数据块长度的调制方案,并引入到单载波频分多址接入(single carrier frequency division multiple access,SC-FDMA)系统中以改善系统PAPR性能。首先,计算当前系统PAPR并使之与阀值PAPR0进行比较。然后,将比较的结果作为反馈信息来控制当前系统可输入的最大数据块长度。数据块长度需要作为边带信息发送给接收端。对lb(M)-1 bit,1 bit和0 bit 3种边带信息情况的SC-FDMA系统进行建模仿真,实验结果表明采用lb(M)-1 bit边带信息的系统能有效降低系统PAPR值,而采用1 bit和0 bit边带信息的系统,因为边带信息量相对较小,对系统的PAPR值降低不显著。For considering the condition that the existed schemes used to reduce the PAPR in modulation systems always base on the fixed symbol block length, in this paper, time-varying symbol block is used in the single carrier frequency division multiple access （SC-FDMA） system to improve the system performance of PAPR. First, calculating the current PAPR in the system and comparing it with a threshold PAPR0 is done. Then, the result of the comparison is used to control the max length of symbol block in system. The length of symbol block is transmitted to receiver as side-information, lb（M） - 1 bit, 1 bit and 0 bit side-information. Those three scenarios are studied by numerical simulations. The simulation results show that the system with lb（M） - 1 bit side-information can clearly reduce the PAPR in SC-FDMA system, and the system with 1 bit and 0 bit side-information is not significant for reducing the PAPR, because of the small side-information.

关 键 词：峰值平均功率比 单载波频分多址接入 边带信息 

分 类 号：TN929[电子电信—通信与信息系统]