Adaptative multi-carrier code division multiple access

• US 7,860,146 B2
• Filed: 07/06/2006
• Issued: 12/28/2010
• Est. Priority Date: 07/06/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Gigle Networks Incorporated (Broadcom, Inc.)
• Inventors: Hurwitz, Jonathan Ephraim David, Molina, Jose Abad, Insua, Juan Carlos Riveiro
• Primary Examiner(s): Ghayour; Mohammad H
• Assistant Examiner(s): Giles; Eboni
• Application Number:
  US11/482,373
• Publication Number:
  US 20080008081A1
• Time in Patent Office: 1,636 Days
• Field of Search: 375/130, 375/222, 375/260, 370/203, 370/335, 370/342, 370/432, 455/126, 455/402
• US Class Current: 375/130
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5425 improving S/N by matching impedance, noise reduction, gain control
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 25/0216 with estimation of channel length
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/3411 reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0085 when channel conditions change

Abstract

A system for performing adaptative multi-carrier code division multiple access (AMC-CDMA) includes first circuitry and modulator circuitry. The first circuitry determines a channel performance metric for each of a plurality of channels. The first circuitry determines at least one parameter of bit loading for each of the channels based on the channel performance metric. The modulator circuitry modulates AMC-CDMA signals using the parameters for bit loading in each of the channels for transmission over a wired connection.

Claims

1. A system for performing adaptative multi-carrier code division multiple access (AMC-CDMA), the system comprising:

first circuitry configured to determine a channel performance metric for each of a plurality of carriers further configured to determine a number of CDMA sequences over the carrier, a length of a CDMA sequence, and a number of bits of a constellation of modulation, at least one of which being determined based on the determined channel performance metric; and

modulator circuitry configured to modulate AMC-CDMA signals using the determined number of CDMA sequences over the carrier, a length of a CDMA sequence, and a number of bits of a constellation of modulation in each of the carriers for transmission over a wired connection.

2. The system of claim 1 wherein the channel performance metric comprises signal-to-noise ratio.

3. The system of claim 1 wherein the channel performance metric comprises bit error rate.

4. The system of claim 1 wherein the wired connection comprises a power line connection.

5. The system of claim 1 further comprising converter circuitry configured to convert a serial signal to a parallel signal.

6. The system of claim 1 further comprising code generator circuitry configured to generate codes for the AMC-CDMA signals.

7. The system of claim 1 further comprising inverse fast fourier transform (IFFT) circuitry configured to perform IFFT functions on the AMC-CDMA signals.

8. The system of claim 1 further comprising receiver circuitry configured to receive and decode the AMC-CDMA signals.

10. The method of claim 8 wherein the channel performance metric comprises signal-to-noise ratio.

9. A method for performing adaptative multi-carrier code division multiple access (AMC-CDMA), the system comprising:

determining a channel performance metric for each of a plurality of carriers;

determining for each carrier of a plurality of carriers a number of CDMA sequences over the carrier, a length of a CDMA sequence, and a number of bits of a constellation of modulation, at least one of which being determined based on the determined channel performance metric; and

modulating the AMC-CDMA signals using the determined number of CDMA sequences over the carrier, a length of a CDMA sequence, and a number of bits of a constellation of modulation in each of the carriers; and

transmitting the AMC-CDMA signals over a wired connection.

11. The method of claim 9 wherein the channel performance metric comprises bit error rate.

12. The method of claim 9 wherein the wired connection comprises a power line connection.

13. The method of claim 9 further comprising converting a serial signal to a parallel signal.

14. The method of claim 9 further comprising generating codes for the AMC-CDMA signals.

15. The method of claim 9 further comprising performing inverse fast fourier transform (IFFT) functions on the AMC-CDMA signals.

16. The method of claim 9 further comprising receiving and decoding the AMC-CDMA signals.

17. A transmitter comprising:

a bit loading memory;

firmware configured to measure a channel performance metric for each of a plurality of carriers;

circuitry configured to

determine a number of CDMA sequences for each of the plurality of carriers, each number of CDMA sequences being determined based on the channel performance metric measured for that carrier,

determine a length of a CDMA sequence for each carrier of a plurality of carriers;

determine a number of bits of a constellation of modulation for each carrier of a plurality of carriers;

store the number of CDMA sequences for each carrier in the bit loading memory;

modulator circuitry configured to modulate a signal in each of the plurality of carriers based on the number of CDMA sequences, the length of the CDMA sequence and the number of bits of a constellation of modulation for each carrier; and

a power line connection configured to couple the modulator circuitry to a power line.

18. The transmitter of claim 17 further comprising a serial to parallel converter configured to receive a gigabit bit stream and a number of virtual carriers and further configured to divide the gigabit bit stream into the number of virtual carriers and provide the divided gigabit bit stream to the modulator circuitry.

19. The transmitter of claim 18 wherein the number of virtual carriers is calculated based on a total number of CDMA sequences.

20. The transmitter of claim 18 further comprising a pseudo noise generator configured to generate a pseudo noise code for each of the number of virtual carriers, and a summarizer configured to receive the dot products of the PN codes with the modulated carrier signals output by the modulator circuitry and further configured to receive the number of CDMA sequences for a frequency.