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 Title: |
US6158041:
System and method for I/Q trellis coded modulation
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Raleigh, Gregory G.; El Granada, CA
Pollack, Michael A.; Cupertino, CA
Jones, Vincent K.; Redwood Shores, CA
Wesel, Richard Dale; Manhattan Beach, CA
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| Assignee: |
Cisco Technology, San Jose, CA
other patents from CISCO TECHNOLOGY, INC. (739062) (approx. 785)
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| Published / Filed: |
2000-12-05
/ 1998-10-14
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| Application Number: |
US1998000172989
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| IPC Code: |
Advanced:
H03M 13/00;
H03M 13/25;
H04L 1/00;
H04L 27/26;
Core:
more...
IPC-7:
H03M 13/23;
H03M 13/41;
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| ECLA Code: |
H04L1/00B7C1; H03M13/00H; H03M13/25T; H04L1/00B5L; H04L1/00B7R1P; H04L1/00B7V; H04L27/26M;
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| U.S. Class: |
Current:
714/792;
714/786;
714/788;
714/790;
714/795;
Original:
714/792;
714/786;
714/788;
714/790;
714/795;
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| Field of Search: |
714/786,788,790,795,792
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| Priority Number: |
| 1998-10-14 |
US1998000172989 |
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| Abstract: |
A high performance system and method for trellis coded modulation are provided by virtue of the present invention. In one embodiment, the trellis coded modulation technique optimizes code performance for a given implementation cost. Also, this trellis coded modulation technique provides optimal performance in the context of periodic symbol deletion, whether this deletion is due to intentional puncturing, the use of interleaving in the presence of fading, or the use of interleaving in an OFDM system used to communicate across a frequency-selective channel.
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| Attorney, Agent or Firm: |
Ritter, Van Pelt & Yi LLP ;
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| Primary / Asst. Examiners: |
Baker, Stephen M.;
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 29 claims |
What is claimed is:
1. A system for providing trellis coded modulation to improve transmission via a channel, said system comprising:
- a convolutional coding system that produces a stream of trellis coded modulation symbols responsive to an input data stream, wherein a first portion of said input data stream is encoded according to a convolutional code to form in-phase components of said trellis coded modulation symbols and a second portion of said input data stream is encoded according to said convolutional code to form quadrature components of said trellis coded modulation symbols,
- wherein said convolutional code is chosen to optimize performance when said trellis coded modulation symbols are subject to periodic deletion.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 29 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G2001-122078
DERABS G2001-122078
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| Other References: |
Wesel et al., "Trellis Code Design for Periodic Interleavers", IEEE Communication Letters.
Al-Semari et al., "I-Q TCM: Reliable Communication Over the Rayleigh Fading Channel Close to the Cutoff Rate", Jan. 1, 1997, IEEE Transactions on Information Theory, vol. 43, No. 1.
Keil et al., "P2 Codes: Pragmatic Trellis Codes Utilizing Punctured Convolutional Codes", Feb. 1995, IEEE Communications Magazine, pp. 94-99.
Wesel et al., "Periodic Symbol Puncturing of Trellis Codes", Nov. 1997, 31st Asilomar Conference on Signals, Systems and Computers.
Richard D. Wesel, "Trellis Code Design for Correlated Fading and Achievable Rates for Tomlinson-Harashima Precoding", 1996, Ph.D. Dissertation at Stanford University.
Wesel et al., "Joint Interleaver and Trellis Code Design", Nov. 3-8, 1997, in proceedings of Globecom 97, Pheonix, AZ.
Wesel et al., "Fundamentals of Coding for Broadcast OFDM", Oct. 30, 1995, in Twenty-Ninth Asilomar Conference on Signals, Systems and Computers.
Leung et al., "Multifrequency Trellis Coding with Low Delay for Fading Channels", Oct. 1993, IEEE Trans. On Comm., 41(10), pp. 1450-1459.
(10 pages)
[ISI abstract]
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