Effect of avalanche photodiode and thermal noises on the performance of binary phase-shift keying-subcarrier-intensity modulation/free-space optical systems over turbulence channels
Effect of avalanche photodiode and thermal noises on the performance of binary phase-shift keying-subcarrier-intensity modulation/free-space optical systems over turbulence channels
复制标题
DOI：
10.1049/iet-com.2012.0600
复制
发表时间：
2013-05-21
影响因子：
1.6
通讯作者：
Pham, Anh T.
中科院分区：
文献类型：
--
作者：
Luong, Duy A.;Thang, Truong C.;Pham, Anh T.
在这项研究中，作者从理论上研究了采用二进制相移键控副载波强度调制和雪崩光电二极管的直接检测自由空间光通信系统的性能。在对数正态和伽马-伽马信道模型的情况下，分别推导了弱到中等和中到强大气湍流条件下的系统误码率和信道容量。作者定量地讨论了在考虑各种湍流条件、雪崩噪声和热噪声的情况下，雪崩光电二极管的平均增益、所需发射光功率和工作比特率的最佳值。结果表明，虽然湍流的影响很大，但在两种情况下，适当选择雪崩光电二极管平均增益可以显著改善系统的性能。对于不同的湍流度，最优值大致相同，但随着接收器噪声温度的变化，最优值会有很大的变化。
In this study, the authors theoretically study the performance of direct-detection free-space optical communication systems using binary phase-shift keying subcarrier-intensity modulation and avalanche photodiode (APD). The system bit-error rate and channel capacity are theoretically derived in cases of log-normal and gamma-gamma channel models for weak-to-moderate and moderate-to-strong atmospheric turbulence conditions, respectively. The authors quantitatively discuss the optimal values of the APD average gain, required transmitted optical power, and operating bit-rate considering various turbulence conditions, APD shot noise and thermal noise. It is seen that, although the impact of turbulence is severe, a proper selection of APD average gain could significantly improve the system performance in both cases of turbulence channels. The optimal value of APD average gain remains almost the same for different levels of turbulence; nevertheless it varies significantly in accordance to the change of receiver noise temperature.