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