Method and system of operation for a variable transmission mode multi-carrier communication system

• US 6,754,169 B2
• Filed: 12/13/2001
• Issued: 06/22/2004
• Est. Priority Date: 12/13/2001
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Baum, Kevin Lynn, Nangia, Vijay
• Primary Examiner(s): Elallam, Ahmed
• Application Number:
  US10/022,295
• Publication Number:
  US 20030112744A1
• Time in Patent Office: 922 Days
• Field of Search: 370/204, 370/206, 370/208, 370/436, 375/130-137, 375/261, 375/298, 375/308, 375/347
• US Class Current: 370/204
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy

Abstract

The present invention provides a method of operation for a variable transmission mode multi-carrier communication system by receiving a signal, determining a link quality as a function of the received signal, and selecting a compound multi-carrier communication mode as a function of the link quality.

Claims

1. A method of operation for a variable modulation communication system comprising:

receiving a signal;

determining a link quality as a function of the received signal;

selecting a spreading factor, modulation, and coding as a function of the link quality; and

transmitting an automatic repeat request, wherein a first transmission is made with a selected compound multi-carrier communication mode with spreading, and a second transmission is made using a compound multi-carrier communication mode that is selected as a function of the link quality.

2. A computer readable medium storing a computer program comprising:

computer readable code for receiving a signal;

computer readable code for determining a link quality as a function of the received signal;

computer readable code for selecting a spreading factor, modulation, and coding as a function of the link quality; and

computer readable code for transmitting an automatic repeat request, wherein a first transmission is made with a selected spreading factor, modulation, and coding with spreading, and a second transmission is made using a spreading factor, modulation, and coding that is selected as a function of the link quality.

3. A method of operating a multi-carrier communication system, the method comprising the steps of:

determining a lint quality of a received signal;

selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein the step of selecting between the multi-carrier communication mode without spreading and the multi-carrier communication mode with spreading comprises the step of selecting between the multi-carrier communication mode without spreading and the multi-carrier communication mode with a plurality of spreading modes;

wherein at least one spreading mode is configured to support a transmission mode that supports greater frequency diversity with a substantially similar data transmission rate as the non-spread mode.

4. The method of claim 3 further comprising the step of:

determining a modulation type, a channel coding, and a spreading factor based on the link quality.

5. The method of claim 4 further comprising the step of:

determining a number of active spreading codes based on the link quality.

6. The method of claim 3 further comprising the step of:

multiplexing transmissions for a plurality of nodes onto different sets of subcarriers.

7. The method of claim 3 wherein the step of selecting based on the link quality comprises the step selecting based on a comparison in performance of a non-spread mode and a spread mode.

8. The method of claim 3 wherein at least one spreading mode is configured to provide multi-carrier code division multiple access with fractional loading.

9. The method of claim 3 wherein at least one spreading mode is configured to provide single-code transmission with a variable spreading factor.

10. The method of claim 3 wherein at least one spreading mode is configured to provide multi-carrier transmission with spreading and multi-code, with a loading near one.

11. The method of claim 3 wherein the step of determining the link quality comprises the step of determining the link quality as a function of at least one parameter of the group consisting of signal to noise plus interference ratio, signal to noise ratio, signal to interference ratio, bit error rate, symbol error rate, word error rate, and frame error rate.

12. The method of claim 3 further comprising the step of:

adjusting at least one of the group consisting of the link quality and a link quality threshold, wherein the adjustment relates to a characteristic of the received signal used to determine the link quality.

13. The method of claim 3 further comprising:

determining a data detector type for a communication device; and

adjusting at least one of the group consisting of the link quality and a link quality threshold, as a function of the type of data detector.

14. The method of claim 3 further comprising the step of transmitting at least one parameter of the selected multicarrier communication mode to a source of a received signal.

15. The method of claim 3 wherein the step of determining the link quality comprises the step of determining the link quality in a first communication device and wherein the method of claim 3 further comprises the step of:

transmitting the link quality to a second communication device, causing the second communication device to select between a multi-carrier communication mode without spreading or a multi-carrier communication mode with spreading based on the link quality.

16. The method of claim 3 wherein the multi-carrier communication mode without spreading includes an orthogonal frequency division multiplexing with adaptive modulation and coding.

17. A method of operating a multi-carrier communication system, the method comprising the steps of:

performing a first transmission using a multi-carrier communication mode with spreading;

performing a second transmission containing redundancy for the first transmission using a multi-carrier communication mode without spreading; and

wherein for the first transmission the multi-carrier communication mode with spreading is configured to support a transmission mode that supports greater frequency diversity with a substantially similar data transmission rate as a comparable multi-carrier communication mode without spreading.

18. A method of operating a multi-carrier communication system, the method comprising the steps of:

performing a first transmission using a multi-cater communication mode with spreading;

determining a link quality;

for a second transmission containing redundancy for the first transmission, selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein for the second transmission, the multi-carrier communication mode with spreading and the multi-carrier communication mode without spreading are configured to support substantially similar transmission rates.

19. A computer readable medium storing a computer program comprising:

computer readable code for determining a link quality of a received signal; and

computer readable code for selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein the multi-carrier communication mode with spreading is configured to support a transmission mode having a greater frequency diversity with a substantially similar data transmission rate as the non-spread mode.

20. A computer readable medium storing a computer program comprising:

computer readable code for performing a first transmission using a multi-carrier communication mode with spreading;

computer readable code for determining a link quality;

for a second transmission containing redundancy for the first transmission, computer readable code for selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein for the second transmission the multi-carrier communication mode with spreading and the multi-carrier communication mode without spreading are configured to support substantially similar transmission rates.

21. A computer readable medium storing a computer program comprising:

computer readable code for performing a first transmission using a multi-carrier communication mode with spreading; and

computer readable code for performing a second transmission containing redundancy for the first transmission using a multi-carrier communication mode without spreading; and

wherein for the first transmission the multi-carrier communication mode with spreading is configured to support a transmission mode that supports greater frequency diversity with a substantially similar data transmission rate as a comparable multi-carrier communication mode without spreading.

22. A method of operating a multi-carrier communication system, the method comprising the steps of:

determining a link quality of a received signal;

selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein the multi-carrier communication mode with spreading is configured to support a transmission mode having a greater frequency diversity with a substantially similar data transmission rate as the non-spread mode.

23. A method of operating a multi-carrier communication system, the method comprising the steps of:

determining a link quality of a received signal;

selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality; and

wherein the multi-carrier communication mode with spreading is configured to provide a transmission rate below a transmission rate provided by a smallest modulation and coding rate (MCR) for the multi-carrier communication mode without spreading.

24. The method of claim 23 wherein the multi-carrier communication mode with spreading is configured to provide multi-carrier code division multiple access with fractional loading.

25. The method of claim 23 wherein the multi-carrier communication mode with spreading is configured to provide single-code transmission with a variable spreading factor.

26. A method of operating a multi-carrier communication system, the method comprising the steps of;

determining a link quality of a received signal;

selecting between a multi-carrier communication mode without spreading and a multi-carrier communication mode with spreading based on the link quality;

wherein the step of selecting between the multi-carrier communication mode without spreading and the multi-carrier communication mode with spreading comprises the step of selecting between the multi-carrier communication mode without spreading and the multi-carrier communication mode with a plurality of spreading modes; and

wherein at least one spreading mode is configured to provide a transmission rate below a transmission rate provided by a smallest modulation and coding rate (MCR) for the multi-carrier communication mode without spreading.

27. The method of claim 26 wherein at least one spreading mode from the plurality of spreading modes is configured to provide multi-carrier code division multiple access with fractional loading.

28. The method of claim 26 wherein at least one spreading mode from the plurality of spreading modes is configured to provide single-code transmission with a variable spreading factor.