一种降低OFDM信号峰均功率比的预编码方法
A precoding method used to reduce peak-to-average power ratio of OFDM signal
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摘要: 正交频分复用(OFDM)系统的一大缺点就是有较高的峰值平均功率比(PAPR),大大降低了线性功率放大器的效率。提出了一种用预编码方法,通过引入预编码矩阵将映射后的数据进行功率分配,从而降低OFDM信号的PAPR。该方法不影响频谱效率,不需要进行附加运算以及收发两端的握手信息。计算机仿真表明对传统的64个子载波OFDM系统PAPR有将近9dB的改善。Abstract: One of the shortcomings of OFDM system is that it has high peak-to-average power ratio(PAPR) which greatly reduces the efficiency of the High Power Amplifier(HPA).A kind of precoding method is proposed to lower PAPR of OFDM signal by dispatching power to the projected data by introducing pre-coded matrix.This method does not have any additional computations and hand-shaking information at both transmitter and receiver ends.Simulation shows that there is about 9dB improvement compared to conventional OFDM system with 64 subcarriers.
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