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

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。

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 pre-coding 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.