Optimal UCA Design for OAM Based Wireless Backhaul Transmission

TL;DR

This paper proposes an optimal design for uniform circular arrays (UCA) to maximize capacity in OAM-based wireless backhaul, by selecting optimal OAM modes and array radius, validated through extensive simulations.

Contribution

It introduces a novel UCA design method that optimally selects OAM modes and array radius to enhance capacity in OAM multiplexing for wireless backhaul.

Findings

Capacity significantly increased with the proposed scheme.

Optimal UCA radius derived analytically.

Mode selection scheme improves data transmission efficiency.

Abstract

Orbital angular momentum (OAM), which is considered as a novel way to achieve high capacity, has been attracted much attention recently. OAM signals emitted by uniform circular array (UCA) are widely regarded to go through the Bessel-form channels. However, the channel gains corresponding to the Bessel-form channels are with low signal-to-noise-ratio (SNR) on OAM-modes and it is difficult to achieve high capacity using all OAM modes. To achieve maximum capacity offered by OAM multiplexing for wireless backhaul communications, in this paper we propose the optimal UCA design, which selects the optimal OAM-modes and radius of receive UCA. We formulate the capacity maximization problem and divide it into two subproblems for obtaining the corresponding optimal UCA design for OAM multiplexing based wireless backhaul communications. In particular, the optimal radius of the receive UCA is firstly derived. Then, we propose an mode selection scheme to choose appropriate OAM-modes for data transmission to maximize the capacity. Extensive simulations obtained validate that the capacity of OAM multiplexing can be significantly increased with our developed scheme.