… The first drawback has been suppressed in the systems utilizing the punctured codes
described in the article: "Rate-compatible punctured convolutional codes (RCPC codes)
and their applications", IEEE Transactions on Communications, J. Hagenauer, vol. 36, No. …
But the use of the punctured convolutional codes having a 1/2 rate described by J.
Hagenauer placed side by side with QAM modulations does not yield optimum performance,
because these codes have been devised independently of the modulation. …