# Precise Error Performance of BPSK Modulated Coherent Terahertz Wireless LOS Links with Pointing Errors

## TL;DR

This paper analyzes how pointing errors and atmospheric turbulence affect the performance of terahertz wireless communication systems.

## Contribution

The study derives exact and asymptotic solutions for error rates in coherent THz systems under different turbulence models.

## Key findings

- Coherent THz links are significantly impacted by atmospheric turbulence and pointing errors.
- Exact and asymptotic bit error rate solutions are derived for log-normal and Gamma–Gamma channels.
- The results provide precise performance estimation for THz communication systems.

## Abstract

One of the key advantages of terahertz (THz) communication is its potential for energy efficiency, making it an attractive option for green communication systems. Coherent THz transmission technology has recently been explored in the literature. However, there exist few error performance results for such a wireless link employing coherent THz technology. In this paper, we explore a comprehensive terrestrial channel model designed for wireless line-of-sight communication using THz frequencies. The performance of coherent THz links is analyzed, and it is found to be notably affected by two significant factors, atmospheric turbulence and pointing errors. These could occur between the terahertz transmitter and receiver in terrestrial links. The exact and asymptotic solutions are derived for bit error rate and interrupt probability for binary phase-shift keying coherent THz systems, respectively, over log-normal and Gamma–Gamma turbulent channels. The asymptotic outage probability analysis is also performed. It is shown that the presented results offer a precise estimation of coherent THz transmission performance and its link budget.