In this paper, a general channel model for THz wireless line-of-sight links is developed and investigated. The propagation of THz waves is divided into two main scenarios, namely deterministic and random conditions. On the one hand, the molecular absorption due to water vapor and oxygen is considered as the deterministic effect on the wave propagation. On the other hand, the atmospheric turbulence conditions as well as pointing errors between THz transmitters and receivers are considered as the random factors affecting the wave propagation. By applying the well-known channel models, namely the log-normal, the gamma–gamma and the exponentiated Weibull, both scenarios are combined efficiently and their effects on the THz wave propagation have been studied. The performance of the derived channels is investigated in terms of the bit-error-rate and channel capacity for the different weather conditions. It has been shown that by using high gain THz reflector antennas, it is possible to have a wireless communication link with the reliable performance. The derived channel models are general and can be applied to any other weather conditions such as rainy, foggy and dusty channels. In addition to the investigation of the random effects as well as the deterministic ones on the propagation of the THz waves, the considered models utilize the modulation scheme for a communication system and therefore the results are promising as an estimator for the overall link performance. Moreover, they can be utilized as the channel and link budget estimator for the future THz wireless communication links.

在本文中，开发并研究了THz无线视线链路的通用信道模型。太赫兹波的传播分为两种主要情况，即确定性条件和随机条件。一方面，由于水蒸气和氧气引起的分子吸收被认为是对波传播的确定性影响。另一方面，大气湍流条件以及太赫兹发射器和接收器之间的指向误差被认为是影响波传播的随机因素。通过应用众所周知的信道模型，即对数正态，伽马-伽马和指数威布尔，有效地组合了这两种情况，并研究了它们对太赫兹波传播的影响。根据不同天气条件下的误码率和信道容量，对派生信道的性能进行了研究。已经表明，通过使用高增益太赫兹反射器天线，可以具有性能可靠的无线通信链路。导出的通道模型是通用的，可以应用于任何其他天气条件，例如多雨，多雾和多尘通道。除了研究随机效应以及对太赫兹波传播的确定性影响外，考虑的模型还利用了通信系统的调制方案，因此，该结果有望作为总体链路性能的估计器。此外，它们可以用作未来THz无线通信链路的信道和链路预算估计器。