Interference and Coverage Analysis for Indoor Terahertz Wireless Local Area Networks

Providing high-bandwidth and fast-speed links, wireless local area networks (WLANs) in the Terahertz (THz) band have huge potential for varieties of bandwidth-intensive indoor applications. However, due to the specific phenomena in the THz band, including severe molecular absorption, human- body blockage, small-scale fading, analysis on the interference, coverage and achievable rate at the downlink is still a challenging problem. In this paper, by using the tool of stochastic geometry, the exact distribution for the received signal power and the approximated distribution for the interference with its analytical moments at an arbitrary user equipment (UE) are derived. More- over, semi-closed-form expressions for the coverage probability and the average achievable rate are investigated. The theoretical derivations are validated with Monte-Carlo simulations. Finally, numerical results demonstrate that narrower beam-width of main lobe at directional antennas and more access points (APs) can enhance the received signal power and the total interference, and effectively influence the coverage and average achievable rate.