Lower Bound on the Capacity of Continuous-Time Wiener Phase Noise Channels

TL;DR

This paper derives a lower bound on the capacity of continuous-time Wiener phase noise channels, analyzing the impact of oversampling and modulation schemes at high SNR, providing insights into channel limitations.

Contribution

It introduces a new lower bound on channel capacity considering oversampling and phase noise, highlighting the differing roles of amplitude and phase modulation at high SNR.

Findings

Capacity pre-log depends on oversampling factor

Amplitude and phase modulation contribute differently at high SNR

Derived a lower bound for capacity with an integrate-and-dump receiver

Abstract

A continuous-time Wiener phase noise channel with an integrate-and-dump multi-sample receiver is studied. A lower bound to the capacity with an average input power constraint is derived, and a high signal-to-noise ratio (SNR) analysis is performed. The capacity pre-log depends on the oversampling factor, and amplitude and phase modulation do not equally contribute to capacity at high SNR.