室内可见光无载波幅度相位调制系统性能分析

发布时间：2019-05-28 06:55

【摘要】：针对室内可见光通信调制技术问题,提出翻转光无载波幅度相位调制和单极性光无载波幅度相位调制两种功率有效的调制方案,二者分别采用"正、负模块极性分组"以及"零值位置极性编码"方法实现信号单极性处理,以满足可见光通信"强度调制/直接检测"的要求.基于朗伯辐射模型,考虑到高斯背景光噪声的可见光直射传输信道,推导了包括直流偏置光无载波幅度相位调制在内的三种调制方案的误比特率闭式表达式,仿真验证了其准确性.在此基础上,分析比较了三者频带利用率,讨论了信道参量对光无载波幅度相位调制系统误码性能的影响,结果表明,在5m×5m×3m的室内场景下,与发射机辐射角为30°和45°相比,0°时的系统误码性能分别优于6.9dB和29.9dB;收发机距离为1m时,误码性能比2m时改善近12dB.
[Abstract]:In order to solve the problem of indoor visible light communication modulation technology, two effective power modulation schemes, flip optical carrier-free amplitude phase modulation and unipolar optical carrier-free amplitude phase modulation, are proposed, which adopt "positive" respectively. The methods of negative module polarity grouping and zero position polarity coding realize signal unipolar processing to meet the requirements of "intensity modulation / direct detection" in visible light communication. Based on Lambert radiation model and considering the visible light direct transmission channel of Gao Si background light noise, the closed expressions of bit error rate (BER) of three modulation schemes, including DC bias optical carrier free amplitude phase modulation, are derived. The accuracy is verified by simulation. On this basis, the frequency band efficiency of the three bands is analyzed and compared, and the influence of channel parameters on the error performance of optical carrier-free amplitude phase modulation system is discussed. the results show that in the indoor scene of 5 m 脳 5 m 脳 3 m, compared with the transmitter radiation angle of 30 掳and 45 掳, The error performance of the system at 0 掳is better than that of 6.9dB and 29.9dB, respectively. When the transceiver distance is 1 m, the error performance is improved by nearly 12 dB compared with 2m.
【作者单位】：大连海事大学信息科学技术学院;
【基金】：国家自然科学基金(No.61371091)资助~~
【分类号】：TN929.1

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