Vandermonde Constrained Tensor Decomposition for Hybrid Beamforming in Multi-Carrier MIMO Systems

TL;DR

This paper introduces a tensor-based hybrid beamforming method with Vandermonde constraints for multi-carrier MIMO systems, balancing performance, complexity, and overhead effectively.

Contribution

It proposes a novel tensor framework with Vandermonde constraints for wideband hybrid beamforming, improving over existing methods in performance and overhead.

Findings

Achieves comparable performance to unit-modulus methods with less overhead.

Outperforms codebook-based methods in link-level tests.

Reduces feedback overhead significantly.

Abstract

Hybrid beamforming has evolved as a promising technology that offers the balance between system performance and design complexity in mmWave MIMO systems. Existing hybrid beamforming methods either impose unit-modulus constraints or a codebook constraint on the analog precoders/combiners, which in turn results in a performance-overhead tradeoff. This paper puts forth a tensor framework to handle the wideband hybrid beamforming problem, with Vandermonde constraints on the analog precoders/combiners. The proposed method strikes the balance between performance, overhead and complexity. Numerical results on a 3GPP link-level test bench reveal the efficacy of the proposed approach relative to the codebook-based method while attaining the same feedback overhead. Moreover, the proposed method is shown to achieve comparable performance to the unit-modulus approaches, with substantial reductions in overhead.