BER of polarization PPM based on atmospheric optical communication

Bit error rate (BER) in atmospheric optical communication is a key issue in the development and application of laser communication system. In order to decrease BER in atmospheric optical communication PPM modulation, a novel modulation method, i.e. polarization pulse position modulation (PPPM) is proposed. In the PPPM system, channel noise and detector noise are the main influencing factors for BER. Based on the characteristics of channel noise and detector noise, this paper discusses the influences of threshold decision and polarization angle demodulation on system performances, sets up a system BER mathematical model and simulates the model. The results show that when SNR is within 0~20 dB, if the SNR increases, the communication system BER caused by threshold decision reduces from 10° to 10-7, and BER has a minimum value when the threshold is 1/2; when the detector noise power is within 10 dBm~-20 dBm, if the detector noise power decreases, the communication system BER caused by polarization angle demodulator decreases; under the same detector noise power, BER has a maximum value for the polarization angle of 0° and a minimum value for the polarization angle of 90°.