Hybrid FSO/THz-based Backhaul Network for mmWave Terrestrial Communication

In this work, a hybrid free-space optics (FSO)/ teraHertz (THz) based backhaul network is considered to provide high-data-rate reliable communication the terrestrial mobile users (MUs) operating at millimeter-wave (mmWave) bands. The FSO link affected by atmospheric turbulence and pointing error impairments. At receiver, both intensity-modulated direct detection heterodyne techniques are considered. multi-antenna THz suffers from high path-loss, small-scale fading, misalignment error. To minimize effect of back-and-forth switching, soft switching method introduced access point (AP) select signal coming through FSO/THz link, comparison with hard presented. Selective decode-and-forward relaying AP. context, we derive closed-form expressions individual link’s outage probability, end-to-end (E2E) asymptotic ergodic capacity, generalized average bit-error-rate. Finally, study different parameters such as turbulence, pointing/misalignment errors, distance, attenuation/path-loss, fading links, number antennas on performance. Our results indicate that, proper method, joint implementation links improves rate/reliability limited overhead.