Signal evaluation apparatus and signal evaluation method
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United States of America Patent
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Jul 18, 2006
Grant Date -
Jul 17, 2003
app pub date -
Dec 2, 2002
filing date -
Dec 4, 2001
priority date (Note) -
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Abstract
There is provided a signal evaluation apparatus and signal evaluation method capable of consistently measuring an accurate bit error rate regardless of the distribution profile of the difference of likelihoods (difference metrics) of data sequences. In the signal evaluation apparatus for decoding data sequences by means of maximum likelihood decoding, at least one pair of paths between which a distance has a minimum value are selected by a path selector circuit 10. With regard to the paths selected by the path selector circuit 10, a difference metric obtained by a difference metric calculator circuit 9 is statistically processed by a .mu.- and .sigma.-calculator circuit 13 to calculate a bit error rate. Then, the bit error rate is corrected by correction means (11, 12, 14) on the basis of the number of measurement samples of the paths selected by the path selector circuit 10 and the number of all samples.
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