Bayesian Massive MIMO Channel Estimation with Parameter Estimation Using Low-Resolution ADCs

TL;DR

This paper introduces a joint signal and parameter estimation method within the AMP framework for massive MIMO systems with low-resolution ADCs, achieving state-of-the-art performance without parameter tuning.

Contribution

It proposes a novel approach that jointly estimates signals and unknown parameters directly in the AMP framework, simplifying the noise model and enhancing practical applicability.

Findings

Achieves state-of-the-art channel estimation performance.

Operates effectively across various noise levels.

Eliminates the need for manual parameter tuning.

Abstract

In order to reduce hardware complexity and power consumption, massive multiple-input multiple-output (MIMO) systems employ low-resolution analog-to-digital converters (ADCs) to acquire quantized measurements $\boldsymbol y$. This poses new challenges to the channel estimation problem, and the sparse prior on the channel coefficient vector $\boldsymbol x$ in the angle domain is often used to compensate for the information lost during quantization. By interpreting the sparse prior from a probabilistic perspective, we can assume $\boldsymbol x$ follows certain sparse prior distribution and recover it using approximate message passing (AMP). However, the distribution parameters are unknown in practice and need to be estimated. Due to the increased computational complexity in the quantization noise model, previous works either use an approximated noise model or manually tune the noise distribution parameters. In this paper, we treat both signals and parameters as random variables and recover them jointly within the AMP framework. The proposed approach leads to a much simpler parameter estimation method, allowing us to work with the quantization noise model directly. Experimental results show that the proposed approach achieves state-of-the-art performance under various noise levels and does not require parameter tuning, making it a practical and maintenance-free approach for channel estimation.