LoRD-Net: Unfolded Deep Detection Network with Low-Resolution Receivers

TL;DR

LoRD-Net is a deep unfolding-based detector designed for recovering signals from one-bit quantized measurements, combining model-based optimization with data-driven learning to outperform existing methods in wireless communication scenarios.

Contribution

It introduces a low-parameter, model-aware deep network for one-bit signal recovery that operates blindly without prior channel knowledge, using a novel two-stage training process.

Findings

Outperforms state-of-the-art methods in one-bit signal recovery

Requires only small training datasets (~500 samples)

Operates effectively without prior channel information

Abstract

The need to recover high-dimensional signals from their noisy low-resolution quantized measurements is widely encountered in communications and sensing. In this paper, we focus on the extreme case of one-bit quantizers, and propose a deep detector entitled LoRD-Net for recovering information symbols from one-bit measurements. Our method is a model-aware data-driven architecture based on deep unfolding of first-order optimization iterations. LoRD-Net has a task-based architecture dedicated to recovering the underlying signal of interest from the one-bit noisy measurements without requiring prior knowledge of the channel matrix through which the one-bit measurements are obtained. The proposed deep detector has much fewer parameters compared to black-box deep networks due to the incorporation of domain-knowledge in the design of its architecture, allowing it to operate in a data-driven fashion while benefiting from the flexibility, versatility, and reliability of model-based optimization methods. LoRD-Net operates in a blind fashion, which requires addressing both the non-linear nature of the data-acquisition system as well as identifying a proper optimization objective for signal recovery. Accordingly, we propose a two-stage training method for LoRD-Net, in which the first stage is dedicated to identifying the proper form of the optimization process to unfold, while the latter trains the resulting model in an end-to-end manner. We numerically evaluate the proposed receiver architecture for one-bit signal recovery in wireless communications and demonstrate that the proposed hybrid methodology outperforms both data-driven and model-based state-of-the-art methods, while utilizing small datasets, on the order of merely $\sim 500$ samples, for training.