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In the case of MRO and Curiosity communications via UHF, an active feedback system was implemented in which Curiosity monitored the quality/SNR of the connection and commanded Curiosity to increase / decrease the data rate accordingly. Does this change in rate occur via a change in the bandwidth of the signal, a change in the coding strategy (eg QPSK to BPSK), a combination of both, or something different? I assume similar strategies are implemented in all kinds of satellite and terrestrial telecommunications as well?

I have a more mechanical aerospace background and I'm trying to learn about telecommunications and this little problem is bugging me like crazy. It seems such a basic concept but I haven't been able to find an answer.

Thanks in advance

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