Ising Machines' Dynamics and Regularization for Near-Optimal Large and Massive MIMO Detection

TL;DR

This paper explores the use of Coherent Ising Machines (CIM) for near-optimal MIMO detection, proposing a regularized Ising formulation that enhances performance and throughput in large-scale wireless systems.

Contribution

It introduces a novel regularized Ising formulation for MIMO detection and demonstrates its potential to significantly increase throughput using CIM-based analog computing.

Findings

CIM-based MIMO detection achieves near-optimal performance.

The approach allows supporting more users and higher throughput.

Estimated 2.5x throughput increase in 16x16 MIMO at mid-SNR.

Abstract

Optimal MIMO detection has been one of the most challenging and computationally inefficient tasks in wireless systems. We show that the new analog computing techniques like Coherent Ising Machines (CIM) are promising candidates for performing near-optimal MIMO detection. We propose a novel regularized Ising formulation for MIMO detection that mitigates a common error floor problem and further evolves it into an algorithm that achieves near-optimal MIMO detection. Massive MIMO systems, that have a large number of antennas at the Access point (AP), allow linear detectors to be near-optimal. However, the simplified detection in these systems comes at the cost of overall throughput, which could be improved by supporting more users. By means of numerical simulations, we show that in principle a MIMO detector based on a hybrid use of a CIM would allow us to add more transmitter antennas/users and increase the overall throughput of the cell by a significant factor. This would open up the opportunity to operate using more aggressive modulation and coding schemes and hence achieve high throughput: for a $16\times16$ large MIMO system, we estimate around 2.5$\times$ more throughput in mid-SNR regime ($\approx 12 dB$) and 2$\times$ more throughput in high-SNR regime( $>$ 20dB) than the industry standard, Minimum-Mean Square Error decoding (MMSE).