Using biterr with negative numbers

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Joe Dombroski
Joe Dombroski 2023-10-31
编辑： Joe Dombroski 2023-10-31
I am tryig to calculate the bit error of a signal with negative values. bitterr will not accept negative values. Is there a trick?
s = -1 + 2*randi([0 1],100,1); % signal of -1 and 1's
n = wgn(100,1,-10); % white gaussian noise variance of -10 dBW
sn=s.*n % signal and noise - this math may be wrong...
[num, ratio]=biterr(s,sn)

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回答（1 个）

John D'Errico
John D'Errico 2023-10-31
编辑：John D'Errico 2023-10-31
Did I not just answer how to solve essentially the same problem, but in the other direction? Read my answer to your last question. If you have a random sequence that is -1 or 1, can you convert it to the [0,1] sequence that biterr needs to see?
What if you added 1, then divide by 2?
That would map -1 into 0, and 1 back into 1.
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Joe Dombroski
Joe Dombroski 2023-10-31
编辑：Joe Dombroski 2023-10-31
Since I am dealing with a AC signal and noise, I thought that I would need to stay in that polarity. I guess I could use a signal that alternates from 0 to 2 to maintain the signal amplitude and SNR. Then I have to deal with shifting the gausian noise to all positive.

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