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26th December 2005, 21:39 #1
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symbol error and bit error
hi
can you determine how symbol and bir error rates are related.and what this relation depends on.

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28th December 2005, 11:39 #2
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Re: how symbol and bit error prob. are related.
hi
P_M : symbol error prob.
P_b : bit error prob.
k : number of bit per each symbol
P_M= [2^(k1)/(2^k1)]*P_b
you must read this book
" digital communication" by proakis(chapter five)

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3rd January 2006, 00:44 #3
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Re: how symbol and bit error prob. are related.
[size=18]if you are using grey code in coding therefore
ser= symbol error rate
ber= bit error rate
k=number of bits per sybol = log (base 2) M
where M is the M ary you are using
therefore ber=ser/k[/size]

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4th January 2006, 18:28 #4
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how symbol and bit error prob. are related.
If gray coding is assumed, the bit error rate is 1/log2(M) of symbol rate where M is the modulation order (for example, M=4 for 4PSK).
However, gray coding is not always applicable to all modulation constellation. In such case, some approxiamate can be found in Proakis's book.
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