Decoding unquantized symbols (AWGN-Channel) using the Viterbi Decoder

Hi everyone,

I have a question concerning the Viterbi-decoder in the communications toolbox: I want to simulate a simple BPSK setup over an AWGN channel, i.e. 0 = +1, 1 = -1, where the information bits are encoded using a convolutional code.

I want to decode using the Viterbi-algorithm, but without any quantization. As already written by Viterbi in his 1971 paper, the corresponding metric is either the inner product between codesymbols and received symbols or the Euclidean distance between them (where the latter has to be minimized).

Now my question is: The Viterbi Decoder in the communications toolbox has an option of unquantized InputFormat. But what kind of input data is needed to perform the decoding? If I calculate LLRs, do I get the output I want to? I assume purely inserting the received continuous values makes no sense.

Thanks