OFDM系统降低峰均功率比的主要技术及其比较  

Major techniques of reducing peak-to-average power ratio for OFDM and their comparison

作　　者：马奔[1] 梁钊[1] 

机构地区：[1]五邑大学信息学院,江门529020

出　　处：《信息技术》2007年第8期21-24,145,共5页Information Technology

基　　金：广东省自然科学基金项目(04011761);江门市科技计划项目(0501)

摘　　要：正交频分复用(OFDM)技术在无线移动通信系统中具有抗多路径衰落和频带间干扰等优点。然而,其主要瓶颈在于OFDM信号的峰均功率比(PAPR)很大,因而容易导致OFDM信号的交调失真和系统性能的下降。阐述了降低OFDM系统峰均比的三类技术:预畸变技术、编码类技术、概率类技术,并对其性能做了比较。Orthogonal Frequency Division Multiplexing （OFDM） is an effective transmission scheme to cope with many impairments, such as cochannel interference, severe multipath fading and impulsive parasitic noise. However, a major drawback of OFDM signals is their high Peak - to - Average Power Ratio （PAPR）, which makes the intermodulation distortion due to the nonlinearity of the high power amplifier. This paper described three kinds of techniques reducing PAPR for OFDM including pre - distorting technique, coding technique and probability technique, and made a comparison between them.

关 键 词：正交频分复用 峰均功率比 选择映射 部分传输序列 有效星座扩展 

分 类 号：TN911[电子电信—通信与信息系统]