which is more susceptible to noise low bitrate or high bitrate

[mpu-rtl]

Which yields higher PSNR? Higher bit rates (128 kbps) or low bit rates (32 kbps)? Thank you for your time.

 

[dick_freebird]

I'd call both of these "low".

The noise type matters some. Phase noise of equal absolute
jitter would bother the "high" rate more, as it consumes or
corrupts a larger percentage of the available eye-space.

Voltage noise probably bothers them equally. But again the
noise character matters; "glitches" might have only a
probabilistic interference when they coincide with a clock
edge, and then the low rate signal would have 4X better
odds of missing a given interfering glitch.

But this smells like a homework question, which wants
your professor's or textbook's opinion and not mine.

 

[betwixt]

Higher bit rates (128 kbps)

:laugh:
Having just worked on a 480 Gigabits per second link that is positively snail speed!

Brian.

 

[weetabixharry]

Having just worked on a 480 Gigabits per second link that is positively snail speed!

I think it depends what you're doing. I am currently working in the terabits per second, but only moving data from one part of an ASIC to another. If I wanted to move information to/from the edge of the galaxy or the bottom of the ocean, then some tens of kilobits per second might be lightning fast.

In response to the original question, I think it's fair to say that under standard (e.g. undergraduate) signal models, higher bit rate signals are more susceptible to noise. As an example, think of a BPSK constellation versus a 256-QAM one with the same SNR. Of course, you could then argue that at higher "coded" bit rates, you could increase redundancy for the same "information" rate. Then I guess it becomes more like a discussion of the Shannon-Hartley theorem, which tells us that the information rate is limited only by bandwidth and SNR (independent of "coded" bit rate).