2017/10/24 by Ding Ming, Hoseini, Sayed Amir, Mahbub Hassan +2
Engineering · #Advanced MIMO Systems Optimization #FOS: Computer and information sciences #Information Theory (cs.IT) #Millimeter-Wave Propagation and Modeling #Molecular Communication and Nanonetworks
paper · pdf · doi:10.48550/arxiv.1710.09031
openalex publication_date 2017/10/24 · openalex created_date 2021/05/24 · openalex updated_date 2026/07/28
In this paper, we compare the performance of two main MIMO techniques,\nbeamforming and multiplexing, in the Terahertz (THz) band. The main problem\nwith the THz band is its huge propagation loss, which is caused by the\ntremendous signal attenuation due to molecule absorption of the\nelectro-magnetic wave. To overcome the path loss issue, massive MIMO has been\nsuggested to be employed in the network and is expected to provide Tbps for a\ndistance within a few meters. In this context, beamforming is studied recently\nas the main technique to take advantage of MIMO in THz and overcome the very\nhigh path loss with the assumption that the THz communication channel is\nLine-of-Sight (LoS) and there are not significant multipath rays. On the other\nhand, recent studies also showed that the well-known absorbed energy by\nmolecules can be re-radiated immediately in the same frequency. Such\nre-radiated signal is correlated with the main signal and can provide rich\nscattering paths for the communication channel. This means that a significant\nMIMO multiplexing gain can be achieved even in a LoS scenario for the THz band.\nOur simulation results reveal a surprising observation that the MIMO\nmultiplexing could be a better choice than the MIMO beamforming under certain\nconditions in THz communications.\n