摘要
由于正交频分复用(OFDM)的峰值平均功率比(PAPR)较高,所以使得功率放大器、D/A、A/D转换器动态范围大,为了解决这一问题,把OFDM调制到载波信号的频率中,使得OFDM变成包络恒定的信号。本设计基于软件无线电(SDR)平台,用System Generator完成恒包络OFDM调制解调的建模仿真。结果表明:恒包络OFDM解决了OFDM高PAPR问题,使得其PAPR变为0 dB,大大节省了功耗,并且增加了系统的灵活性,更加有利于系统的更新和升级。
Because the PAPR of OFDM is very high,it makes the dynamic range of its power amplifier,D/A,A/D becomes much larger.In order to solve this problem,OFDM is used to modulate the carrier,which finally makes OFDM signal to be a constant envelope signal.This design is based on SDR,and it complements the modulation and demodulation of OFDM using System Generator,toolbox under Simulink.This method is turned out to be available to settle the high PAPR of OFDM since the PAPR turned to be 0 dB.As a result,the power efficiency is saved in a great deal,furthermore.By this way,it increases the flexibility of the system,and makes it more convenient to change and update.
出处
《电视技术》
北大核心
2013年第19期164-167,共4页
Video Engineering
基金
广西无线宽带通信与信号处理重点实验室主任基金项目(10911)
