摘要
提出了一种新的降低正交频分复用(OFDM)系统峰均功率比(PAPR)的方法。该方法首先将输入符号对大幅度输出采样信号的贡献程度作为衡量尺度,根据该尺度确定一定数量的符号进行幅度预矫正以降低PAPR;再对幅度大于给定门限的OFDM信号进行压缩,从而进一步降低PAPR。其中幅度预矫正具有算法简单、灵活的特点,而部分压缩能比压扩变换更好地保持信号幅度的分布特性。仿真结果表明,该方法比压扩变换能更有效地降低系统的峰均功率比,而且具有较小的带外功率。
A new method is proposed to reduce the peak-to-average multiplexing （OFDM） system. The method is based on amplitude power ratio（PAPR ） of orthogonal frequency division predistortion of the input symbols, the predistorted symbols being selected according to a metric which measures their contribution to the output signal samples of large amplitude. Then the OFDM signal whose amplitude is greater than a given threshold is compressed to reduce more PAPR. The amplitude predistortion algorithm is simple and flexible. And the partial compression can maintain the distribution characteristic of signal amplitude better than companding transform. The simulation results show that the proposed scheme can reduce PAPR effectively with less spectrum side-lobes than companding transform.
出处
《电测与仪表》
北大核心
2009年第7期28-31,共4页
Electrical Measurement & Instrumentation
关键词
正交频分复用(OFDM)
压扩变换
幅度预矫正
峰均功率比(PAPR)
orthogonal frequency division multiplexing （OFDM）, companding transform, amplitude predistortion, peak-to-average power ratio （PAPR）
