Performance Analysis of Air-to-Water Optical Wireless Communication Using SPADs
Performance Analysis of Air-to-Water Optical Wireless Communication Using SPADs
复制标题
DOI：
10.1109/globecom38437.2019.9013591
复制
发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
Pooya Nabavi;M. Yuksel
中科院分区：
文献类型：
--
作者：
Pooya Nabavi;M. Yuksel
要建立与暴露在光线不足的水下接收器之间的高度可靠的光无线通信链路，需要具有检测每个携带信息的光子的能力的高灵敏度接收器。为此，单光子雪崩二极管(SPAD)接收器可以被认为是光接收器系统的适当选项，因为它们受益于有源猝灭和偏置电路，并提供相当高的断开电压，从而在理想情况下为光学系统提供检测每个接收到的光子的能力。然而，现有的SPAD接收器的灵敏度和带宽都受到死区时间和有限的光子探测效率的限制。在这项研究中，评估了水下SPAD接收器在检测位于海面上方自由空间的光发射机发送的信息时的性能。为此，采用鞍点近似和Birnbaum-Saunders分布对空-水光无线通信信道的衰落系数和SPAD的统计光子计数行为进行了统计建模。然后通过获得误码率的解析关系来评估通信链路的性能。最后，给出了数值模拟结果，并研究了在不同传输比特率下，死时间对光接收系统信息检测的负面影响。
Establishing highly reliable optical wireless communication links to submerged receivers exposed to insufficient light requires highly sensitive receivers with the ability to detect each photon carrying information. To this end, single photon avalanche diode (SPAD) receivers can be considered an appropriate option for the optical receiver system as they benefit from active quenching and biasing circuits, and offer a considerably high breaking voltage, providing the optical system with the ability to detect every single received photon in the ideal case. However, the sensitivity and bandwidth of the existing SPAD receivers have been limited by their dead time and limited photon detection efficiency. In this study, the performance of underwater SPAD receivers in detecting transmitted information from an optical transmitter located in the free space above the sea surface was assessed. To this end, the saddle-point approximation was used along with the Birnbaum-Saunders distribution to statistically model the fading coefficient of the air-to-water optical wireless communication channels and the statistical photon counting behavior of SPADs. The performance of the communication link was then assessed by obtaining the analytical relations for bit error rate. Finally, the results of numerical simulations are presented and the negative effects of dead time on information detection in the optical receiver system in various transmission bit rates are studied.