The Analyze of LED Communication System Error Rate Based on Spread Spectrum Technology and PPM

LED traffic communication can solve flexible the problem of mobile communication terminal in intelligent traffic communication system, however, the low error rate in the condition of long distance is the key of LED optical communication in the intelligent transportation applications. In order to further improve the performance of LED traffic communication system and reduce the error rate, the spread spectrum technology with strong anti-interference capability and pulse position modulation (PPM) technology with high power and high efficiency are applied into the system. The simulation results show that we can get the relationship between signal to noise ratio (SNR) and error rate in the condition of Gaussian white noise, the spread spectrum technology combined with PPM can get lower error rate comparing with single PPM, which can improve the communication quality and distance in the LED traffic communication system.