基于扩频技术降低OFDM信号峰值功率并改善信噪比的方法  

Method of reducing peak power of OFDM signal and improving SNR based on spread spectrum technique

作　　者：赵迎新[1] 吴岳[1] 吴虹[1] 

机构地区：[1]南开大学信息技术科学学院,天津300071

出　　处：《系统工程与电子技术》2012年第10期2147-2151,共5页Systems Engineering and Electronics

基　　金：中央高校基本科研业务费专项基金(65121011)资助课题

摘　　要：正交频分复用(orthogonal frequency division multiplexing,OFDM)技术具有频带利用率高、抗多径干扰能力强等优势,但具有较高的峰值功率是限制其应用的一个主要问题。针对OFDM信号具有高峰值,提出一种新型的降低OFDM信号峰值功率的方法。该方法基于混合信号扩频技术,将OFDM时域信号分解为若干段,其中有一段为连续信号,其余几段为离散信号,这些信号经交织后发送。在接收端,提出新的部分信号恢复法对信号解交织和重新组合。仿真表明,该方法能够有效地降低OFDM信号的峰值功率,同时可以获得扩频处理增益,从而改善系统的误码性能。The Orthogonal frequency division multiplexing （OFDM） technology has the advantages of high bandwidth efficiency, resistance to multipath interference and so on. But its higher peak power is a major prob- lem. A new mix signal spread spectrum technique is suggested to reduce the peak power of OFDM signals. By means of the technique, the time domain signals are divided into one continuous part and several discrete parts and sent out after interleaving. A partial signal restoration method is proposed to restore the signals in the re- ceiver. Simulation results show that the peak power is decreased and the processing gain of the system can be gotten, thus improving the performance of the bit error ratio .

关 键 词：正交频分复用 扩频 峰值功率 信噪比 

分 类 号：TN914.4[电子电信—通信与信息系统]