viterbi decoder

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Abi Aarthy
Abi Aarthy 2012-1-20
decoder2=vitdec(decode2,trel,20,'cont','hard');
here the length of decode2 is 75 bits. but we are getting the error as:Length of the input code vector must be a multiple of the number of bits in an input symbol. please help us.

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回答（1 个）

Walter Roberson
Walter Roberson 2012-1-20
log2(trel.numInputSymbols) must evenly divide length(decode2)
http://www.mathworks.com/help/toolbox/comm/ref/vitdec.html
Each symbol in the vector decoded consists of log2(trellis.numInputSymbols) bits.
  2 个评论
Abi Aarthy
Abi Aarthy 2012-1-21
sir,
we donot know how to implement this function"log2(trellis.numinputsymbols)".
Walter Roberson
Walter Roberson 2012-1-21
As I indicated at the beginning of my response,
log2(trel.numInputSymbols)
The trel here is the same as the trel variable you are passing as the second argument to vitdec .

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