基于APPM的TCM码在无线光通信系统中的误码性能分析

BER Performance of Analysis of TCM Code Based on APPM for Optical Wireless Communication System

把网格编码调制(TCM)引入到光脉冲幅度位置调制(APPM)中,研究其对无线光通信系统误码性能的改善.通过分析及对2×4-TCMAPPM、4PPM和2×8-TCMAPPM、8PPM分别进行MATLAB仿真,得到以下结论:在保持带宽不变的前提下,2×4-TCMAPPM与4PPM信息速率相同,但前者误码性能优于后者,且最大达到14.7 dB;2×8-TCMAPPM的信息速率与8PPM相同,但前者误码性能优于后者,且最大可达到11.7 dB.TCM确实能有效地改善系统的差错性能.

Trellis Coded Modulation（TCM） introduced into APPM in optical wireless communication system, to find its improvement of the BER performance of optical wireless communication system. Through analysis and MATLAB simulation of 2 × 4 - TCMAPPM, 4PPM and 2 × 8 - TCMAPPM, 8PPM, result is that holding bandwidth constant, The BER of performance of 2 × 4-TCMAPPM is above up to 14.7 dB times better than 4PPM as their information speed is the same and the BER of performance of 2× 8-TCMAPPM is above up to 11.7 dB times better than 8PPM while their information speed is the same. Conclusion is acquired that TCM improves the error performance of that system effectively.