Turbo-Coding DOCSIS Information for Satellite Communications

• US 20100262895A1
• Filed: 04/05/2010
• Published: 10/14/2010
• 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
• Granted Patent: US 8,010,882 B2
• Time in Patent Office: Days
• 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. (canceled)

3. The system of claim 1, further comprising a turbo-encoding circuit, in an integrated circuit, coupled to an output of the encoder.

5. The system of claim 3, 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 DOCSIS-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.

6. A wireless device including the system of claim 1.

7. A wireless terrestrial device including the system of claim 1.

8. A wireless access termination device including the system of claim 1.

9. A fixed wireless modem including the system of claim 1.

10. An integrated circuit including the system of claim 1.

12. The method of claim 10, further comprising turbo-encoding the DOCSIS-compliant data using an integrated circuit having a turbo encoder circuit.

13. The method of claim 10, further comprising generating baseband-frequency in-phase and quadrature-phase components of the DOCSIS-compliant data.

14. The method of claim 12, 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.

15. The method of claim 13, 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.

16. The method of claim 14, wherein the converting comprises converting the digitally pre-compensated common sample rate baseband-frequency in-phase and quadrature-phase components to the analog signal.

17. The method of claim 10, wherein the encoding comprises encoding the DOCSIS-compliant data with a convolutional code.

18. The method of claim 10, wherein the encoding comprises encoding the DOCSIS-compliant data with a convolutional inner code and a Reed-Solomon outer code.

19. The method of claim 17, wherein an error correcting ability of the Reed-Solomon outer code is set to zero.

20. A wireless device configured to perform the method of claim 10.

21. A wireless terrestrial device configured to perform the method of claim 10.

22. A wireless access termination device configured to perform the method of claim 10.

24. An integrated circuit configured to perform the method of claim 10.

2. 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 digital-to-analog converter configured to convert the encoded data to an analog signal; and

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

4. The system of claim 2, 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.

11. 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;

converting the encoded data to an analog signal; and

upconverting the analog signal to a wireless signal.

23. A fixed wireless modem configured to perform the method of claim