Comment on 'Comparison of two convolutional orthogonal coding techniques for CDMA radio communication systems'

摘要

For original paper see ibid., vol.43, no.6, p.2028, 1995. This brief comment points out that the comparison is between a quasi-optimal metric for a word-by-word coding and interleaving technique and a sub-optimal metric for a bit-by-bit technique. When the sub-optimal receiver for the latter is replaced by an improved quasi-optimal metric, the difference in performance of the two techniques is much reduced for slow fading, while for fast fading, the bit-by-bit scheme is superior.