水下光通信PPM数字接收机的DSP实现

水下光通信充分利用了海水对激光的衰减窗口效应,具有隐蔽、安全、非接触和快速机动等特性,兼具无线通信和光纤通信的优点,其关键技术在于光收发端机的研制;PPM(Pulse Position Modulation)数字脉冲位置调制具有低平均功率和高峰值功率等特性,特别适合用于无线数字光通信。两者性能的融合需要高灵敏度数字光接收机的实现。利用阵列光电检测接收、高速A/D转换和信号处理等相关技术,采用DSP处理器,高灵敏度的数字光PPM接收机得以实现,实验和测试表明它大大降低了接收机对于整个系统信噪比的要求,获得了较好的性能。

The realization of PPM digital receiver with DSP in underwater optical communication

Underwater optical communication integrates the advantages of optical-fiber communication and wireless communication,which key technology is the optical transceiver.Pulse Position Modulation(PPM)has the characteristic of low average power and high peak power which makes it be suitable for optical communication very much.The good integration of those advantages of underwater optical communication and PPM needs the implementation of high sensitivity digital receiver.One high sensitivity DSP digital receiver is achieved by use of array detection,high speed A/D and signal processing.It is showed by the experiment that this digital receiver reduces the requirement of SNR greatly.