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. 2024 Aug 20;26(8):706.
doi: 10.3390/e26080706.

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

Mingbo Niu  1 , Ruihang Ji  1 , Hucheng Wang  1 , Huan Liu  1
Affiliations

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

Mingbo Niu et al. Entropy (Basel). .

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.

Keywords: atmospheric turbulence; binary phase-shift keying; coherent THz; outage probability; pointing errors.

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Conflict of interest statement

The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
Block diagram of a coherent THz link.
Figure 2
Figure 2
Detector and beam footprint with misalignment on the detector plane.
Figure 3
Figure 3
Atmospheric decay due to molecular absorption and FSPL losses in the frequency ranges of 1 GHz to 350 GHz.
Figure 4
Figure 4
BER performance of coherent THz links for two different turbulent channels with z=200 m.
Figure 5
Figure 5
BER of coherent THz links for different turbulence intensities GG channel with pointing errors for a distance z=1000 m.
Figure 6
Figure 6
The outage probability of coherent THz links over the GG fading channel with pointing errors.
See this image and copyright information in PMC

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