Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1997-11-03
2000-10-10
De Cady, Albert
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
H03M 1303
Patent
active
061311804
ABSTRACT:
A time-varying trellis code is used to obtain a desired effective code rate which produces an encoder output directly mappable onto a signal constellation. The time-varying trellis code is obtained by using a variable rate encoder which produces, at its output, the correct number of bits to map directly onto the desired signal constellation. The input data stream is coded at a first code rate during a first selected time interval, and at a second code rate during a second selected time interval. By varying the code rate at periodic intervals, a third effective code rate is obtained.
REFERENCES:
patent: 4581601 (1986-04-01), Calderbank et al.
patent: 4788694 (1988-11-01), Calderbank
patent: 5159610 (1992-10-01), Eyuboglu et al.
patent: 5394439 (1995-02-01), Hemmati
patent: 5461632 (1995-10-01), Lomp et al.
patent: 5621761 (1997-04-01), Heegard
patent: 5657333 (1997-08-01), Ikekawa
patent: 5812601 (1998-09-01), Schramm
patent: 5844922 (1998-12-01), Wolf et al.
patent: 5862155 (1999-01-01), Lomp et al.
Chan et al., Performance of Punctured Trellis Coded Modulation Over Fading Channels, IEEE, p. 339 to 343, May 7, 1997.
Rate Compatible Punctured Convolutional Codes (rpcpc codes) and their Applications ,Joachim Hagenauer,IEEE p389-400, Apr. 4, 1988.
Fang, R.J.F. "A Coded 8-PSK System for 140-Mbit/s Information Rate Transmission Over 80-MHz Nonlinear Transponders", 7.sup.th Int'l Conference on Satellite Communications, May 12-16 1986, pp. 305-314, XP-002093827.
Bertelsmeier, Manfred, "Modified coded Octal Phas-Shift Keying With Improved Carrier-Phase Tracking Ability", IEEE Global Telecommunications Conference, Dec. 1-4, 1986, pp. 1356-1360, vol. 3, XP-002093828.
Mao, Tom R., "Hybrid Trellis-Coded CPFSK Signalling", IEEE Singapore Int'l Conference on Networks/Int'l Conference on Information Engineering, Jul. 3-7, 1995, pp. 309-312, XP-002093829.
Li Hui; Noll, Peter; "Comparative Study of Two Rate-Selective Coding Techniques", Vortage Der Itg-Fachtagung 130, Jan. 26, 1994-Oct. 28, 1994, pp. 177-183, CP-000503792.
Nakajima, Shigeo; "Adaptive Coding Rate Trellis-Coded 8PSK System", IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E80-A, No. 7, Jul. 1997, pp. 1190-1195, XP-000748950.
Sundberg, Carl-Erik; Hagenauer, Joachim; "Hybrid Trellis-Coded 8/4-PSK Modulation Systems", IEEE Transactions on Communications, vol. 38, No. 5, May 1990, pp. 602-613, XP-000136883.
Cady Albert De
Chase Shelly A
Ericsson Inc.
LandOfFree
Trellis coded modulation system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Trellis coded modulation system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trellis coded modulation system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2263982