School of Information Engineering, Nanchang University, Nanchang 330031, China.
State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
Sensors (Basel). 2019 Mar 1;19(5):1042. doi: 10.3390/s19051042.
To achieve long-distance underwater optical wireless communication, a single photon detector with single photon limit sensitivity is used to detect the optical signal at the receiver. The communication signal is extracted from the discrete single photon pulses output from the detector. Due to fluctuation of photon flux and quantum efficiency of photon detection, long-distance underwater optical wireless communication has the characteristics that the link is easily interrupted, the bit error rate is high, and the burst error is large. To achieve reliable video transmission, a joint source-channel coding scheme based on residual distributed compressive video sensing is proposed for the underwater photon counting communication system. Signal extraction from single photon pulses, data frame and data verification are specifically designed. This scheme greatly reduces the amount of data at the transmitter, transfers the computational complexity to the decoder in receiver, and enhances anti-channel error ability. The experimental results show that, when the baud rate was 100 kbps and the average number of photon pulses per bit was 20, the bit error rate (BER) was 0.0421 and video frame could still be restored clearly.
为实现远距离水下光无线通信，采用具有单光子极限灵敏度的单光子探测器来检测接收器处的光信号。通信信号从探测器输出的离散单光子脉冲中提取。由于光子通量和光子探测量子效率的波动，远距离水下光无线通信具有链路容易中断、误码率高、突发错误大的特点。为实现可靠的视频传输，针对水下光子计数通信系统，提出了一种基于残差分布式压缩视频传感的信源信道联合编码方案。专门设计了从单光子脉冲中提取信号、数据帧和数据验证。该方案大大减少了发射机的数据量，将计算复杂度转移到接收机中的解码器，并增强了抗信道错误的能力。实验结果表明，当波特率为 100 kbps 且每个比特的平均光子脉冲数为 20 时，误码率（BER）为 0.0421，仍可清晰恢复视频帧。
