DocumentCode :
997504
Title :
Pragmatic trellis coding applied to rectangular QAM
Author :
Kokuryo, Yoshiro ; Tsukamoto, Nobuo
Author_Institution :
Div. of Yagi Antenna, Hitachi Kokusai Electr. Inc., Saitama, Japan
Volume :
51
Issue :
2
fYear :
2005
fDate :
5/1/2005 12:00:00 AM
Firstpage :
365
Lastpage :
370
Abstract :
Although Ungerboeck´s TCM (trellis coded modulation) is attractive in terms of high efficiency with low descending data rate by coding and high coding gain, it is difficult to implement. To remove this complexity, a pragmatic approach to the TCM, which is realized by employing the de facto convolutional code (constraint length K=7 and rate 1/2), was proposed. In this paper, a simpler realization of the TCM of rectangle type 2N QAM (N is even number; ≥ 4) by using the pragmatic approach is presented. We have independently shown the convolutional coding and the Viterbi decoding by the decomposition from two-dimensions into each one-dimension. By this decomposition, it is possible to apply the pragmatic approach to minimize the hardware and cost. Therefore, it is very useful for 64 QAM or 256 QAM applications such as digital video broadcasting over digital cable TV (ITU-T J.83) and fixed wireless access (IEEE 802.16) systems. It can be applied not only to single carrier QAM but also to multi-carrier QAM like OFDM.
Keywords :
Viterbi decoding; computational complexity; convolutional codes; error correction codes; forward error correction; quadrature amplitude modulation; trellis coded modulation; OFDM; Viterbi decoding; de facto convolutional code; digital cable TV; digital video broadcasting; fixed wireless access; forward error correction; multicarrier QAM; pragmatic approach; pragmatic trellis coding; quadrature amplitude modulation; rectangular QAM; trellis coded modulation; Cable TV; Convolutional codes; Costs; Decoding; Digital video broadcasting; Hardware; Modulation coding; OFDM; Quadrature amplitude modulation; Viterbi algorithm;
fLanguage :
English
Journal_Title :
Consumer Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0098-3063
Type :
jour
DOI :
10.1109/TCE.2005.1467973
Filename :
1467973
Link To Document :
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