LED traffic light’s visible light communication may become the good choice for the outside intelligent transportation system. In order to research and overcome the strong background noise’s interference on LED traffic light’s visible light communication, a strong background noise model for its communication channels is established. Under three different modulations which are PPM, Gold and Gold+PPM, communication system models are established. Firstly, the relative parameters of strong background light are analyzed, and then the system’s BER qualities are compared under PPM, Gold and Gold+PPM. The results show that the smaller field of view of the receiver, the smaller the diameter of the receiver, the smaller interference of the communication system by the background light noise. When detection signal power is the same, the background noise from directed sun light is more influential for system’s communication qualities than extension background light. Besides, under the same background noise, the lowest BER is PPM. Gold’s BER is middle while system BER of Gold+PPM is the highest. Take extension background light’s BER as a reference, when it is 10-4, PPM communication system’s detection signal power is 0.125 W and 0.5 W lower than those of Gold and God+PPM, respectively.