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I'm coding a basic simulation of using error correcting codes to transmit data from a satellite back to earth. I'm not sure what to set the "noise level" to. Let's say a satellite orbiting Mars transmits a signal which contains 128 bits, approximately how many of those bits would be changed by the time the signal reaches earth?

This is just for fun so I don't need any references, just an approximation, however it would still be interesting if someone could point me to a reliable source :)

Update: I'm basing this on Mariner 9, I managed to find that the transmissions were at 20 watts, using the S-Band, which I think is somewhere around 2.2 ghz

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I would say that depends on the strength of the signal transmitted and the frequency of the transmission... Could you update with these details? –  Kitchi Nov 28 '12 at 5:49
    
I'm basing this on Mariner 9, the specs for the radio are 20 watts, S-Band (2-4ghz?) –  Sam Kennedy Nov 28 '12 at 12:51
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