为解决基于LED交通灯的可见光通信系统中信号衰减快和自然光噪声干扰大的问题，利用分集接收技术，设计了一种先比较选择再增益整合的接收方式。该方法根据相似性比较原则，采用概率运算，先选择所有接收支路中具有信号相似性较多的支路，舍去其他相似性较少的支路，对选择出来的支路进行等增益合并。仿真结果表明，相比直接分集接收方式，采用相似性比较的分集接收方式能够提供更好的误码率性能(BER)和更远的信号可靠传输距离。

Diversity reception technology is adopted to solve problems such as quick signal attenuation, large noise from natural light interference, in visible light wireless communication based on LED traffic lights. A receiving method with comparison, choice and gain combination is designed. According to the principle of comparability comparison and probability calculation, if the branches in the majority have the same comparability, these branches are chosen, and those in the minority are abandoned. And then equal gain combination is carried out by using branches chosen previously. The simulation result shows that, compared with the direct diversity reception manner, better Bit Error Rate (BER) performance and longer reliable communication distance can be provided by using comparability comparison in diversity reception.