On the use of PN Ranging with High-rate Spectrally-efficient Modulations

TL;DR

This paper explores coupling PN ranging with high-rate spectrally-efficient modulations, proposing a receiver scheme for simultaneous demodulation and ranging, and demonstrating improved spectral efficiency with maintained ranging accuracy.

Contribution

It introduces a novel receiver design enabling parallel cancellation of telemetry and ranging signals with high-order modulations, enhancing spectral efficiency.

Findings

Filtered high-order modulations improve spectral efficiency.

The proposed scheme maintains comparable ranging performance.

Proper loop bandwidth sizing limits jitter caused by modulation envelope.

Abstract

In this paper, we study the feasibility of coupling the PN ranging with filtered high-order modulations, and investigate the simultaneous demodulation of a high-rate telemetry stream while tracking the PN ranging sequence. Accordingly, we design a receiver scheme that is able to perform a parallel cancellation, in closed-loop, of the ranging and the telemetry signal reciprocally. From our analysis, we find that the non-constant envelope property of the modulation causes an additional jitter on the PN ranging timing estimation that, on the other hand, can be limited by properly sizing the receiver loop bandwidth. Our study proves that the use of filtered high-order modulations combined with PN ranging outperforms the state-of-the-art in terms of spectral efficiency and achievable data rate, while having comparable ranging performance.