Abstract
This report reproduces the physical-layer link- budget analysis of a joint communication and sensing (JCS) system operating in the terahertz (THz) band from a low Earth orbit (LEO) satellite, following the model of Aliaga et al. The downlink budget at 174.8 GHz is re-implemented in MATLAB, including atmospheric absorption, spreading loss, and the resulting bit energy-to-noise-density ratio (Eb/N0) as a function of satellite elevation angle. As a small extension, a Monte-Carlo bit-error-rate (BER) simulator is built for BPSK and QPSK and verified against the analytic Q-function. The simulator is used to extract the required Eb/N0 threshold at a target BER of 10−6, which is then mapped back onto the link budget to identify the minimum usable elevation angle. The extracted threshold (10.47 dB) agrees with the analytic value (10.5 dB), confirming the correctness of the simulation pipeline. Index Terms—Terahertz communications, joint communication and sensing, link budget, Monte-Carlo simulation, bit error rate, satellite communications.
Read the project paper here: Project Report
The implementation code of the project are at LinkBudget.