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为实现长波红外无线激光通信,基于CO2激光器设计了数字脉冲间隔调制(DPIM)方案。考虑脉冲信号受噪声影响在时域上的展宽问题,分析了接收到的空时隙大小受噪声影响的变化规律,在此基础上提出了一种硬解调方案。综合幅度判决和空时隙判决得到了系统总误码率的表达式,并分析了调制阶数、单个时隙长度与误码率的关系。结果表明可以通过选取合适的调制阶数和单个时隙长度实现最佳的DPIM调制方案。
In order to realize long-wave infrared wireless laser communication, a digital pulse interval modulation (DPIM) scheme is designed based on CO2 laser. Considering the broadening of the pulse signal affected by the noise in the time domain, the change rule of the size of the received null slot affected by noise is analyzed. Based on this, a hard demodulation scheme is proposed. The integrated amplitude decision and the empty slot decision are used to obtain the expression of the total bit error rate of the system, and the relationship between the modulation order, the length of a single time slot and the bit error rate is analyzed. The results show that the optimal DPIM modulation scheme can be achieved by choosing the appropriate modulation order and single slot length.