基于部分采样点辅助校正OFDM信号的准无损压缩算法
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Nearly Loss-less Compression Algorithm Based on Partial Sample Points Calibration for OFDM Signal
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    摘要:

    传统的正交频分复用(Orthogonal frequency division multiplexing,OFDM)信号压缩算法由于低的压缩比和低的信号量化误差比(Signal to quantization-error ratio,SQR)造成较高的误码率,无法满足OFDM系统的需求。为了实现高的压缩比和低的误码率,提出了一种联合削峰尾插(Clipping with tail plug,CTP)技术、几何级数压扩(Geometric series companding,GSC)技术及部分采样点校正(Partial sample calibration,PSC)技术的准无损压缩算法。计算机仿真结果表明,对于4096-正交幅度调制(Quadrature amplitude modulation,QAM)的OFDM信号,压缩比最高可达1.86∶1,误码率低于10-7,量化误差对应的平均SQR高达70 dB,因而能够很好地满足光纤到分配点+千兆数字用户线路(Fiber to the distribution point+GCga digital subscriber line,FTTdp+GDSL)系统的需求。

    Abstract:

    Traditional compression algorithms of OFDM signals with low compression ratio and signal to quantization-error ratio(SQR) come along with a high error rate, which fail to meet the requirements of OFDM systems. To achieve the high compression ratio and the low e rror rate, a new algorithm is proposed based on a combination of clipping with tail plug (CTP), geometric series companding (GSC) and partial sample calibration (PSC). The new algorithm can achieve the nearly loss-less compression and the compression ratio can be as high as 1.86∶1 with a error rate less than 10-7, while SQR corresponding to the quantization error is 70 dB in 4096-QAM OFDM signal modulation schemes meeting the requirements of the FTTdp+GDSL systems well.

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戴宪华,李妍,余宝贤,苏冬日.基于部分采样点辅助校正OFDM信号的准无损压缩算法[J].数据采集与处理,2015,30(3):504-510

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  • 在线发布日期: 2015-07-31