Efficient Hybrid Amplitude-Phase Quantization for Multi-Antenna Relay System

TL;DR

This paper introduces a hybrid amplitude-phase quantization method for multi-antenna relay systems that reduces memory usage and maintains performance, improving upon existing uniform quantization techniques.

Contribution

The paper proposes H-APQ, an adaptive quantization scheme that combines amplitude and phase quantization to enhance efficiency in MIMO relay systems.

Findings

H-APQ reduces relay memory consumption significantly.

H-APQ maintains high performance comparable to existing methods.

H-APQ is suitable for practical MIMO relay implementations.

Abstract

This letter explores relay quantization in multi-antenna quantize-forward (QF) relay systems. Existing methods, such as uniform phase quantization (U-PQ) and uniform amplitude-phase quantization (U-APQ), suffer from performance saturation and high memory demands. To overcome these limitations, we propose hybrid amplitude-phase quantization (H-APQ), which adaptively quantizes received signal amplitudes based on their relative magnitudes while applying uniform quantization to individual phases. H-APQ significantly reduces memory consumption at the relay while maintaining strong overall performance, offering an efficient solution for multiple-input multiple-output (MIMO) QF relay systems.