Title :
Comment on "Comparison of two convolutional orthogonal coding techniques for CDMA radio communication systems"
Author :
Viterbi, Andrew J.
Author_Institution :
Qualcomm Inc., San Diego, CA, USA
fDate :
6/1/1996 12:00:00 AM
Abstract :
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.
Keywords :
Gaussian channels; code division multiple access; convolutional codes; fading; interleaved codes; radiocommunication; AWGN channel; CDMA radio communication systems; bit-by-bit technique; convolutional orthogonal coding techniques; fast fading; interleaving technique; performance; quasi-optimal metric; slow fading; sub-optimal metric; sub-optimal receiver; word-by-word coding; Convolutional codes; Correlators; Decoding; Demodulation; Fading; Interleaved codes; Multiaccess communication; Radio communication; Receivers; Viterbi algorithm;
Journal_Title :
Communications, IEEE Transactions on
