降低OFDM信号峰均功率比的压缩扩张技术

A companding technique for reducing peak-to-average power ratio of OFDM signals

对降低OFDM信号峰均功率比的压缩扩张技术进行了研究,提出了一种新的收敛型压扩函数.该函数在不改变原始OFDM信号平均功率的前提下,使信号的瞬时功率形成均匀分布,实现了小信号扩张,大信号压缩.通过定量调整压扩函数中的参数,可获得低于3dB的峰均功率比.计算机仿真表明:与已有的压缩扩张技术相比,在相同的系统条件下,新的压缩扩张技术不仅具有较低的复杂度,而且具有更小频谱失真和更低的系统误比特率.

A companding technique was studied on for reducing peak-to-average power ratio （PAPR） of orthogonal frequency division multiplexing （OFDM） signals, and a novel convergent companding function was proposed. The companding function makes the instantaneous power of OFDM signals form uniform distribution, realizing large signal compressing and small signal expanding without changing the average power of original signals. Meanwhile, it can also attain the PAPR less than 3dB through quantificationally tuning up parameters. The computer simulation shows that, comparing with the existent companding technique, this new companding technique has not only lower computational complexity but also less spectrum distortion and lower bit error ratio under the same system condition. It＇s really a practical and effective method of reducing PAPR of OFDM signals.