Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Patent
1997-08-15
1999-03-02
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
375265, 375308, 375332, 375341, 371 432, 371 434, H04L 2718
Patent
active
058780858
ABSTRACT:
A communication system (10) includes a rotationally invariant pragmatic trellis coded modulation (PTCM) encoder (18) and decoder (34). The PTCM encoder (18) partitions information bits (20) into primary (42) and secondary (44) data streams. A pilot bit (56) is inserted into the secondary data stream (44) during each frame (46). The secondary stream (44) then receives rate 1/2 convolutional encoding (60) that is punctured to a rate of 9/16. The primary data stream (42) is differentially encoded (50). The encoded primary and secondary streams are concurrently phase mapped (70) using an 8-PSK constellation so that an effective code rate of 5/6 results. The PTCM decoder (34) convolutionally decodes (84) the secondary stream, then re-encodes secondary stream estimates using a systematic, transparent convolutional encoder (88). The pilot bit is evaluated (92) in the re-encoded symbol estimates (90) to detect and correct any secondary stream inversion that may have occurred due to phase ambiguity. After this correction, the secondary modulation is removed (98) from phase value estimates, and the primary stream is decoded.
REFERENCES:
patent: 4462101 (1984-07-01), Yasuda et al.
patent: 5233629 (1993-08-01), Paik et al.
patent: 5233630 (1993-08-01), Wolf
patent: 5396518 (1995-03-01), How
patent: 5428631 (1995-06-01), Zehavi
patent: 5469452 (1995-11-01), Zehavi
patent: 5535228 (1996-07-01), Dong et al.
patent: 5602583 (1997-02-01), Citta
patent: 5633881 (1997-05-01), Zehavi et al.
patent: 5757856 (1998-05-01), Fang
Viterbi et al. "A Pragmatic Approach to Trellis-Coded Modulation", IEEE Communications Magazine, Jul. 1989 pp. 11-19.
Wolf and Zehavi, "P.sup.2 Codes: Pragmatic Trellis Codes Utilizing Punctured Convolution Codes", IEEE Communications Magazine, Feb. 1995 pp. 94-99.
D. Delaruelle, "A Pragmatic Coding Scheme for Transmission of 155 Mbit/s SDH and 140 Mbit/s PDH Signals Over 72 MHz Transponders", Proc. ICDSC-10, Brighton, May 1995.
G. David Forney, Jr and Edward K. Hower, "A High-Speed Sequential Decoder: Prototype Design and Test", IEEE Transactions on Communication Technology, Oct. 1971, vol. COM-19 No. 5 pp. 821-835.
M. Vanderaar et al., A Low Complexity Digital Encoder-Modulator for High Data Rate Satellite BISDN Applications, IEEE 1996, pp. 357-33.
Pietrobon et al., "Trellis-Coded Multidimensional Phase Modulation," IEEE Transactions on Information Theory, Jan. 1990, vol. 36 No. 1.
Cochran Bruce A.
Liebetreu John M.
McCallister Ronald D.
Chin Stephen
Gluck Jeffrey W.
Gresham Lowell W.
Meschkow Jordan M.
SiCOM, Inc.
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