# Zero-Delay Source-Channel Coding with a One-Bit ADC Front End and Correlated Side Information at the Receiver

## TL;DR

This paper investigates the optimal encoding and decoding strategies for zero-delay Gaussian source transmission over an AWGN channel with a one-bit ADC front end and correlated side information, focusing on MSE and DOP criteria.

## Contribution

It derives necessary optimality conditions for encoder and decoder design and reveals the structure of numerically optimized encoders under different performance criteria.

## Key findings

- Optimal encoder is periodic with period increasing with source-side information correlation.
- For DOP, the encoder periodically takes positive and negative values that decay with source magnitude.
- The interval of non-zero encoder values widens as correlation increases.

## Abstract

Zero-delay transmission of a Gaussian source over an additive white Gaussian noise (AWGN) channel is considered with a one-bit analog-to-digital converter (ADC) front end and a correlated side information at the receiver. The design of the optimal encoder and decoder is studied for two performance criteria, namely, the mean squared error (MSE) distortion and the distortion outage probability (DOP), under an average power constraint on the channel input. For both criteria, necessary optimality conditions for the encoder and the decoder are derived. Using these conditions, it is observed that the numerically optimized encoder (NOE) under the MSE distortion criterion is periodic, and its period increases with the correlation between the source and the receiver side information. For the DOP, it is instead seen that the NOE mappings periodically acquire positive and negative values, which decay to zero with increasing source magnitude, and the interval over which the mapping takes non-zero values, becomes wider with the correlation between the source and the side information.