Turbo-coding DOCSIS information for satellite communications

• US 8,010,882 B2
• Filed: 04/05/2010
• Issued: 08/30/2011
• Est. Priority Date: 07/31/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kwentus, Alan, Dale, Mark, Lin, Dorothy, Wang, Joyce, Chien, Jen-chieh, Hartman, David L., Brescia, Rocco J. Jr., Gin, Alan
• Primary Examiner(s): Chase; Shelly A
• Application Number:
  US12/754,460
• Publication Number:
  US 20100262895A1
• Time in Patent Office: 512 Days
• Field of Search: 714/746, 714/755, 714/784, 714/786, 370/208, 370/342, 370/465, 370/466
• US Class Current: 714/786
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 2025/0342 QAM
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Abstract

Methods and systems for modifying DOCSIS-based transmission paths for communication in higher frequency and/or wireless environments, such as wireless terrestrial communication systems and satellite communication systems. An inner turbo-code is combined with a DOCSIS based Reed-Solomon (“RS”) forward error correction (“FEC”) coding scheme, to produce a concatenated turbo-RS code (other FEC codes can be utilized). In phase and quadrature phase (“I-Q”) processing is utilized to enable relatively low cost up-converter implementations. The I-Q processing is preferably performed at baseband, essentially pre-compensating for analog variations in the transmit path. Power amplifier on/off control capable of controlling on/off RF power control of remote transmitters is modulated on a transmit cable to reduce the need for a separate cable.

Claims

1. A system for processing data generated in compliance with Data Over Cable Service Interface Specification-type (DOCSIS) standards, comprising:

an encoder configured to encode DOCSIS-compliant data with an encoding scheme having forward error correction;

a turbo-encoding circuit coupled to an output of the encoder to generate turbo encoded DOCSIS-compliant data;

a digital-to-analog converter configured to convert the turbo encoded DOCSIS-compliant data to an analog signal; and

an upconverter configured to up-convert the analog signal to a wireless signal.

2. The system of claim 1, further comprising an in-phase and quadrature-phase modulator coupled to an output of the turbo encoding circuit, configured to generate baseband-frequency in-phase and quadrature-phase components of turbo encoded DOCSIS-compliant data.

3. The system of claim 2, further comprising a digital processor coupled to outputs of the in-phase and quadrature-phase modulator, the digital processor including an interpolator configured to interpolate the baseband-frequency in-phase and quadrature-phase components to a common sample rate that is higher than a plurality of DOCS IS-compliant bandwidth sample rates, the digital processor configured to pre-compensate the common sample rate in-phase and quadrature-phase components for impairments encountered in subsequent components.

4. A method for processing data generated in compliance with a Data Over Cable Service Interface Specification (DOCSIS) standard, comprising:

encoding the DOCSIS-compliant data with an encoding scheme having forward error correction to generate encoded data;

turbo-encoding the DOCSIS-compliant data using an integrated circuit having a turbo encoder circuit to generate turbo encoded DOCSIS-compliant data;

generating baseband-frequency in-phase and quadrature-phase components of the turbo encoded DOCSIS-compliant data;

converting the in-phase and quadrature components of the turbo encoded DOCSIS-compliant data to an analog signal; and

upconverting the analog signal to a wireless signal.

5. The method of claim 4, further comprising interpolating the baseband-frequency in-phase and quadrature-phase components to a common sample rate that is higher than a plurality of DOCSIS-compliant bandwidth sample rates.

6. The method of claim 5, further comprising digitally pre-compensating the common sample rate baseband-frequency in-phase and quadrature-phase components for an impairment encountered in a subsequent processes.

7. The method of claim 6, wherein the converting comprises converting the digitally pre-compensated common sample rate baseband-frequency in-phase and quadrature-phase components to the analog signal.

8. The method of claim 4, wherein the encoding comprises encoding the DOCSIS-compliant data with a convolutional code.

9. The method of claim 4, wherein the encoding comprises encoding the DOCSIS-compliant data with a convolutional inner code and a Reed-Solomon outer code.

10. The method of claim 9, wherein an error correcting ability of the Reed-Solomon outer code is set to zero.