Τίτλος:
Tri-Polarized Holographic MIMO Surfaces for Near-Field Communications: Channel Modeling and Precoding Design
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
This paper investigates the utilization of triple polarization (TP) for multi-user (MU) wireless communication systems with holographic multiple-input multi-output surfaces (HMIMOSs), targeting capacity boosting and diversity exploitation without enlarging the antenna array sizes of the transceivers. We specifically consider that both the transmitter and receiver are equipped with an HMIMOS consisting of compact sub-wavelength TP patch antennas and operating in the near-field (NF) regime. To characterize TP MU-HMIMOS systems, a TP NF channel model is constructed using the dyadic Green’s function, whose characteristics are leveraged to design two precoding schemes for mitigating the cross-polarization and inter-user interference contributions. Specifically, a user-cluster-based precoding scheme that assigns different users to one of three polarizations, at the expense of system’s diversity, is presented together with a two-layer precoding technique that removes interference using a Gaussian elimination method. A theoretical correlation analysis for HMIMOS-based systems operating in the NF region is also derived, revealing that both the spacing of transmit patch antennas and user distance impact transmit correlation factors. Our numerical results showcase that the users located far from the transmit HMIMOS experience higher correlation than those closer in the NF region, resulting in a lower channel capacity. In terms of channel capacity, it is demonstrated that the proposed TP HMIMOS-based systems almost achieve 1.25 and 3 times larger gain compared to their dual-polarized version and conventional HMIMOS systems, respectively. It is also shown that the the proposed two-layer precoding scheme combined with two-layer power allocation realizes the highest spectral efficiency, among compared schemes, without sacrificing diversity. IEEE
Συγγραφείς:
Wei, L.
Huang, C.
Alexandropoulos, G.C.
Yang, Z.
Yang, J.
Sha, W.E.I.
Zhang, Z.
Debbah, M.
Yuen, C.
Περιοδικό:
IEEE Transactions on Wireless Communications
Εκδότης:
Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Λέξεις-κλειδιά:
Antenna arrays; Channel capacity; Energy efficiency; Holography; Microstrip antennas; MIMO systems; Radiation efficiency; Radio transceivers; Slot antennas; Spectrum efficiency, Channel modelling; Correlation; Full polarization; Holographic MIMO surface; Interference; Near-field communication; Noise measurements; Precoding; Precoding designs; Spectral efficiencies; Wireless communications, Polarization
DOI:
10.1109/TWC.2023.3266298
