基于削峰尾插和几何级数压扩变换的OFDM时域信号压缩算法

The OFDM Time Domain Signal Compression Algorithm Based on Clipping with Tail Plug(CTP)and Geometric Series Companding(GSC)

研究了FTTdp+GDSL(光纤到户+数字用户线路)组网中的OFDM时域信号有损压缩问题.为了降低OFDM信号的峰均比,分别提出了削峰尾插技术(CTP)和几何级数压扩变换(GSC)两种数据压缩算法,应用于数据压缩模型,并进行了实验验证.仿真结果表明:本方法能够较好地实现光纤传输系统中OFDM时域信号的压缩,性能可达到压缩比为1.4∶1时,解压缩输出信噪比不低于55dB;压缩比为1.75∶1时,解压缩输出信噪比不低于50dB.

The main researches were focused on the lossy compression of OFDM time domain signals in net- work of FTTdp ＋ GDSL. In order to decrease the peak-to-average power ratio, two data compression algorithms, namely Clipping with Tail Plug and Geometric Series Companding, were proposed in this paper and were applied to the model of data compression for validation. Simulation study indicated that these two methods performed well of compressing OFDM time domain signals in the system of fiber transportation, the properties can achieve that decompression output signal noise ratio is less than 55 dB when compress ratio is 1.4 ： 1, and decompression output signal ratio is less than 50 dB when compress ratio is 1.75 ： 1.