基于离散余弦变换的SC-FDMA系统  

A DCT-based SC-FDMA system

作　　者：庄陵[1] 王光宇[1] 邵凯[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,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第6期691-694,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(1028)~~

摘　　要：在单载波频分多址接入(single carrier frequency division multiple access,SC-FDMA)系统中提出用Ⅰ型、Ⅱ型、Ⅲ型、Ⅳ型4种不同类型离散余弦变换代替离散傅里叶变换。基于不同变换,分别推导上行链路传输信号时域表达式,并对推导式展开分析,比较基于不同类型离散余弦变换的SC-FDMA系统信号的特性及PAPR(peak to av-erage power ratio)性能。仿真结果表明基于DCT-Ⅱ的SC-FDMA系统与基于DFT(discrete Fourier transform)的系统一致,具有更好的PAPR特性。The cosine transforms are used as an alternative to the discrete Fourier transform （DFT） for single carrier frequency division multiple access （SC-FDMA） system. The time domain expressions of the DCT SC-FDMA signals for uplink wireless transmissions are derived. These accurate results are used to examine and compare the peak to average power ratio （PAPR） performance of these four DCT-based SC-FDMA systems and the conventional discrete Fourier transform （DFT）- based SC-FDMA system in an AWGN environment. Analysis and simulation results show that the DCT- Ⅱ SC-FDMA system provides a better PAPR performance than the other DCT SC-FDMA systems, the DFF SC-FDMA system, and the OFDMA system.

关 键 词：单载波频分多址 离散余弦变换 峰均比 

分 类 号：TN911[电子电信—通信与信息系统]