English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper investigates the utilization of triple polarization (TP) formulti-user (MU) holographic multiple-input multi-output surface (HMIMOS)wireless communication systems, targeting capacity boosting and diversityexploitation without enlarging the antenna array sizes. We specificallyconsider that both the transmitter and receiver are both equipped with anHMIMOS consisting of compact sub-wavelength TP patch antennas within thenear-field (NF) regime. To characterize TP MU-HMIMOS systems, a TP NF channelmodel is constructed using the dyadic Green's function, whose characteristicsare leveraged to design two precoding schemes for mitigating thecross-polarization and inter-user interference contributions. Specifically, auser-cluster-based precoding scheme assigns different users to one of threepolarizations at the expense of the system's diversity, and a two-layerprecoding scheme removes interference using the Gaussian elimination method ata high computational cost. The theoretical correlation analysis for HMIMOS inthe NF region is also investigated, revealing that both the spacing of transmitpatch antennas and user distance impact transmit correlation factors. Ournumerical results show that the users far from transmitting HMIMOS experiencehigher correlation than those closer within the NF regime, resulting in a lowerchannel capacity. Meanwhile, in terms of channel capacity, TP HMIMOS can almostachieve 1.25 times gain compared with dual-polarized HMIMOS, and 3 timescompared with conventional HMIMOS. In addition, the proposed two-layerprecoding scheme combined with two-layer power allocation realizes a higherspectral efficiency than other schemes without sacrificing diversity.

Tri-Polarized Holographic MIMO Surface in Near-Field: Channel Modeling and Precoding Design