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In this paper, we study the feasibility of coupling the PN ranging withfiltered high-order modulations, and investigate the simultaneous demodulationof a high-rate telemetry stream while tracking the PN ranging sequence.Accordingly, we design a receiver scheme that is able to perform a parallelcancellation, in closed-loop, of the ranging and the telemetry signalreciprocally. From our analysis, we find that the non-constant envelopeproperty of the modulation causes an additional jitter on the PN ranging timingestimation that, on the other hand, can be limited by properly sizing thereceiver loop bandwidth.  Our study proves that the use of filtered high-order modulations combinedwith PN ranging outperforms the state-of-the-art in terms of spectralefficiency and achievable data rate, while having comparable rangingperformance.

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