基于BPSK-SIM调制的室外可见光通信误码性能分析  

Analysis of bit error rate for outdoor visible light communications based on BPSK-SIM modulation

作　　者：孟德帅[1] 梁中华[1] 刘丹莉 

机构地区：[1]长安大学信息工程学院

出　　处：《激光杂志》2018年第1期128-132,共5页Laser Journal

基　　金：国家自然科学基金(No.61271262)

摘　　要：室外可见光通信（Outdoor Visible Light Communication,OVLC）受大气湍流等因素影响,造成光强随机变化,严重影响系统的传输性能。研究了弱湍流信道模型下室外可见光通信并推导出包括二进制相移键控子载波强度调制（Binary Phase Shift Keying Subcarrier Intensity Modulation,BPSK-SIM）五种不同预调制方式下子载波强度调制系统的误码率理论表达式。进而对比分析了BPSK多子载波系统和单子载波系统误码性能。数值分析结果表明BPSK-SIM系统能够更有效的缓解光强闪烁效应;多子载波系统相比于单子载波能够增加系统容量,但是需要更高的信噪比。The outdoor visible light communication （OVLC） is influenced by the factors including turbulence and attenuation in atmosphere channel, and these factors lead to random change of the optical intensity, which has a severe impact on signal detection. In this paper, the OVLC in weak turbulence channel model is studied. Moreover, the bit error rate （BER） expressions are derived including binary phase shift keying subcarrier intensity modulation （BPSK- SIM）. Meanwhile, we also provide the expressions of the bit error rate for various premodulation subcarrier systems. The BER performance of BPSK multi-carrier and single carrier systems are also analyzed and compared. Numerical re- sults show that the BPSK-SIM system can more effectively mitigate intensity fluctuation. The multi-carrier system can increase system capacity compared with single subcarriers, but requires higher signal to noise ratio （SNR）.

关 键 词：室外可见光通信 大气弱湍流信道 BPSK-SIM 多子载波强度调制 

分 类 号：TN929.12[电子电信—通信与信息系统]