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Communication decoder employing single trellis to support multiple code rates and/or multiple modulations

a communication decoder and single trellis technology, applied in the field of communication systems, can solve the problems of low rate of prior art turbo codes across noisy communication channels, and achieve the effect of improving the accuracy of the decoder

Inactive Publication Date: 2007-01-11
BROADCOM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, these prior art turbo codes largely operate at relatively low rates across the noisy communication channels.
Still, the focus of effort here has continued to be achieving low error floors, and not specifically towards reaching higher throughput.

Method used

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  • Communication decoder employing single trellis to support multiple code rates and/or multiple modulations
  • Communication decoder employing single trellis to support multiple code rates and/or multiple modulations
  • Communication decoder employing single trellis to support multiple code rates and/or multiple modulations

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Embodiment Construction

[0069] The variable code rate functionality of the invention may properly be described as being within the context of turbo trellis code modulation (TTCM) communication systems. TTCM coding may also be viewed as a hybrid combination of turbo coding and trellis code modulation (TCM). Some of the particular embodiments of the invention are performed within communication systems that may more properly be categorized as being parallel concatenated turbo code modulation (PC-TCM) communication systems.

[0070]FIGS. 1-9 illustrate a number of communication systems context embodiments where certain aspects of the invention may be implemented.

[0071]FIG. 1 is a system diagram illustrating an embodiment of a satellite communication system 100 that is built according to the invention. A satellite transmitter 110 includes a TTCM encoder 112. The TTCM encoder 112 is one of several possible embodiments that are described herein. The TTCM encoder 112 is operable to encode data that is to be transmi...

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Abstract

Communication decoder employing single trellis to support multiple code rates and / or multiple modulations. A single trellis is employed by the decoder to decode a plurality of encoded symbols. Each of the plurality of encoded symbols is governed by a rate control. A rate control sequence, having a period, is used to decode the plurality of encoded symbols that may be arranged within a frame. Various parameters of the plurality of encoded symbols may vary on a symbol by symbol basis; these parameters may include modulation, constellation, mapping, and / or bandwidth efficiency. For example, various symbols may be encoded differently, yet they may all be decoded using the same trellis. The functionality of this decoder may be implemented within a variety of different decoder embodiments including a trellis code modulation (TCM) decoder, a turbo trellis code modulation (TTCM) decoder, and / or a parallel concatenated turbo code modulation (PC-TCM) decoder.

Description

CROSS REFERENCE TO RELATED PATENTS / PATENT APPLICATIONS Continuation Priority Claim, 35 U.S.C. §120 [0001] The present U.S. Utility patent application claims priority pursuant to 35 U.S.C. §120, as a continuation, to the following U.S. Utility patent application which is hereby incorporated herein by reference in its entirety and made part of the present U.S. Utility patent application for all purposes: [0002] 1. U.S. Utility application Ser. No. 10 / 338,377, entitled “Communication decoder employing single trellis to support multiple code rates and / or multiple modulations,” (Attorney Docket No. BP2333.2), filed Jan. 8, 2003, pending, which claims priority pursuant to 35 U.S.C. §119(e) to the following U.S. Provisional Patent Application which is hereby incorporated herein by reference in its entirety and made part of the present U.S. Utility patent application for all purposes: [0003] 1. U.S. Provisional Patent Application Ser. No. 60 / 384,698, entitled “Variable code rate and signal ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03M13/03
CPCH03M13/256H03M13/258H03M13/2957H03M13/6516H03M13/3988H03M13/6362H03M13/3905
Inventor CAMERON, KELLY BRIANSHEN, BA-ZHONGTRAN, HAU THIEN
Owner BROADCOM CORP
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