Adaptative multi-carrier code division multiple access

• US 20080008081A1
• Filed: 07/06/2006
• Published: 01/10/2008
• Est. Priority Date: 07/06/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Gigle Semiconductor, Inc. (Broadcom, Inc.)
• Inventors: Hurwitz, Jonathan Ephraim David, Molina, Jose Abad, Insua, Juan Carlos Riveiro
• Granted Patent: US 7,860,146 B2
• Time in Patent Office: Days
• US Class Current: 370/203
• 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 channels and determine at least one parameter of bit loading for each of the channels based on the channel performance metric; and

modulator circuitry configured to modulate AMC-CDMA signals using the at least one parameter for bit loading in each of the channels for transmission over a wired connection.

2. The system of claim 1 wherein the at least one parameter of bit loading comprises a number of code division multiple access sequences over a carrier.

3. The system of claim 1 wherein the at least one parameter of bit loading comprises a length of a code division multiple access sequence.

4. The system of claim 1 wherein the at least one parameter of bit loading comprises a number of bits of a constellation of modulation.

5. The system of claim 1 wherein the at least one parameter of bit loading comprises a length of a chip in a code division multiple access sequence.

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

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

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

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

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

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

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

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

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

determining at least one parameter of bit loading for each of the channels based on the channel performance metric;

modulating AMC-CDMA signals using the at least one parameter for each of the channels; and

transmitting the AMC-CDMA signals over a wired connection.

14. The method of claim 13 wherein the at least one parameter of bit loading comprises a number of code division multiple access sequences over a carrier.

15. The method of claim 13 wherein the at least one parameter of bit loading comprises a length of a code division multiple access sequence.

16. The method of claim 13 wherein the at least one parameter of bit loading comprises a number of bits of a constellation of modulation.

17. The method of claim 13 wherein the at least one parameter of bit loading comprises a length of a chip in a code division multiple access sequence.

18. The method of claim 13 wherein the channel performance metric comprises signal-to-noise ratio.

19. The method of claim 13 wherein the channel performance metric comprises bit error rate.

20. The method of claim 13 wherein the wired connection comprises a power line connection.

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

22. The method of claim 13 further comprising generating codes for the AMC-CDMA signals.

23. The method of claim 13 further comprising performing inverse fast fourier transform (IFFT) functions on the AMC-CDMA signals.

24. The method of claim 13 further comprising receiving and decoding the AMC-CDMA signals.