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The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is

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The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is

(a) M/M-1

(b) 2M/M-1

(c) (M/2)/M-1

(d) M/M+1

The question was asked by my college professor while I was bunking the class.

Question is taken from M-ary Signalling and Performance in division Bandpass Modulation and Detection of Digital Communications

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Right answer is (c) (M/2)/M-1

Easy explanation: The relationship between the probability of bit error and probability of symbol error is (M/2)/M-1 in M-ary orthogonal signalling.

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