OFDM系统中峰均比抑制与预失真联合技术研究  

Research on Combined Technology of PAPR Reduction and Pre-distortion in OFDM Systems

作　　者：林倩[1] 郭里婷[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350002

出　　处：《电视技术》2011年第2期17-19,43,共4页Video Engineering

基　　金：福建省自然科学基金项目(2009J050144)

摘　　要：为了减少高功率放大器的非线性对OFDM系统传输信号的影响,首先通过改进的限幅法降低OFDM信号的峰均比,使其不会超出功放的动态变化范围。然后通过预失真技术扩大功放的线性范围,补偿功放的非线性。最后通过仿真验证了改进限幅法和预失真技术的联合可以在系统误比特率提高不大的情况下,明显降低信号功率谱的带外扩展,从而降低对邻道信号的干扰,减小带内损耗,提高功放的效率。In order to reduce the influence of the non systems, improved clipping is firstly used to reduce PAPR linearity of high power amplifier on the transmission signals in OFDM of OFDM signals, making the signals not exceed the dynamic range of the power amplifier. Then pre-distortion technology is used to expand the linearity range of the power amplifier, and compensate non-linearity of the power amplifier. Finally, simulation results prove that without obviously increasing bit error rate in the system, the combination of improved clipping and pre-distortion technology can significantly reduce out-of-band spreading of signal power spectrum, accordingly reduce adjacent-channel interference and in-band loss, and increase efficiency of the power amplifier.

关 键 词：限幅 预失真 高功率放大器 峰均比 正交频分复用 

分 类 号：TN919.3[电子电信—通信与信息系统]