Abstract
In this paper, the performance of a mixed terahertz/free-space optical (THz/FSO) wireless transmission system is studied, where the joint effects of fading and pointing errors are considered for both THz and FSO links. Employing the fixed-gain amplify-and-forward protocol, we derive the cumulative distribution function of the end-to-end signal-to-noise ratio (SNR). By relying on the statistic, the exact analytical expressions for the outage probability (OP) and average bit error rate (BER) are derived in terms of the bivariate Fox's H-function. In order to attain more physical insights, the asymptotic OP and average BER expressions are also presented, based on which the diversity gain is determined and it is shown to depend on the fading parameters and pointing errors. In addition, illustrative numerical results are plotted and it is observed that the path loss, fading, and pointing errors lead to a considerable degradation in system performance.
Published Version
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