An investigation into the turbodecoder is presented. It was carried out to determine whether the decoded bit sequence constitutes a (at least) local maximum in the likelihood between possible codewords in the composi...
详细信息
An investigation into the turbodecoder is presented. It was carried out to determine whether the decoded bit sequence constitutes a (at least) local maximum in the likelihood between possible codewords in the composite code trellis. The answer was obtained experimentally using a modified iterative turbo decoder. Results show that the turbodecoder does not necessarily lead to a maximum likelihood sequence estimator being realised for the composite code. Moreover, finding a closer code in a Euclidean distance sense only degrades the bit error rate of the system.
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