Mode lookup tables for data transmission in wireless communication channels based on statistical parameters

• US 7,191,381 B2
• Filed: 12/05/2000
• Issued: 03/13/2007
• Est. Priority Date: 09/19/2000
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Gesbert, David J., Catreux, Severine E., Heath, Robert W. Jr.
• Primary Examiner(s): Lamarre; Guy J.
• Application Number:
  US09/730,687
• Publication Number:
  US 20020056066A1
• Time in Patent Office: 2,289 Days
• Field of Search: 714/774, 714/704, 714/708, 714/748, 714/751, 714/759, 370/252, 370/345, 370/206, 375/259, 375/261, 375/267, 455/102
• US Class Current: 714/759
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0021 in which the algorithm uses adaptive thresholds
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method and medium tangibly embodying the method of constructing a lookup table of modes for encoding data for transmission in a wireless communication channel from a transmit unit to a receive unit by using at least one quality parameter of the data and its first-order and second-order statistical parameters to arrange the modes in the lookup table. The first-order and second-order statistical parameters can be determined from a simulation of the wireless communication channel or from field measurements of the wireless communication channel. The modes in the lookup table are ordered by a target value of a communication parameter such as PER, BER, data capacity, signal quality, spectral efficiency, throughput or another suitable communication parameter set to achieve a desired quality of service. The quality parameter selected is conveniently a short-term quality parameter such as signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR) or power level. During use adjustments depending on the instantaneous condition of the channel can be used to tune the lookup table.

Claims

1. A method of constructing a lookup table of modes for encoding data for transmission in a wireless communication channel from a transmit unit to a receive unit, said method comprising:

a) selecting at least one short-term quality parameter associated with the communication channel as received by said receive unit;

b) determining a first-order statistical parameter of said at least one quality parameter;

c) determining a second-order statistical parameter of said at least one quality parameter; and

d) arranging said modes in said lookup table based on said first-order statistical parameter and based on said second-order statistical parameter.

2. The method of claim 1, wherein said first-order statistical parameter and said second-order statistical parameter are determined from a simulation of said wireless communication channel.

3. The method of claim 1, wherein said first-order statistical parameter and said second-order statistical parameter are determined from a field measurement of said wireless communication channel.

4. The method of claim 1, further comprising:

a) selecting a communication parameter;

b) setting a target value of said communication parameter; and

c) arranging said modes in said lookup table based on said target value.

5. The method of claim 4, wherein said communication parameter is a statistical communication parameter.

6. The method of claim 4, further comprising:

a) measuring a measured value of said communication parameter in said wireless communication channel;

b) assigning an adjustment to at least one of said first-order statistical parameter and said second-order statistical parameter based on a difference between said measured value and said target value.

7. The method of claim 1, wherein said second-order statistical parameter comprises a variance of said short-term quality parameter.

8. The method of claim 7, wherein said variance is selected from the group consisting of temporal variance and frequency variance.

9. The method of claim 1, wherein said short-term quality parameter is selected from the group consisting of signal-to-interference and noise ratio, signal-to-noise ratio and power level.

10. The method of claim 1, wherein said first-order statistical parameter comprises a mean of said at least one quality parameter.

11. The method of claim 1, wherein said second-order statistical parameter comprises a variance of said at least one quality parameter.

12. The method of claim 11, wherein said data is transmitted at more than one frequency and said variance is a frequency variance.

13. The method of claim 11, wherein said data is transmitted in a multi-carrier scheme and said variance is a frequency variance.

14. The method of claim 11, wherein said variance is a temporal variance.

15. A storage medium tangibly embodying a lookup table of modes for encoding data for transmission in a wireless communication channel from a transmit unit to a receive unit, said storage medium comprising instructions for:

a) selecting at least one short term quality parameter associated with the communication channel as received by said receive unit;

b) determining a first-order statistical parameter of said at least one quality parameter;

c) determining a second-order statistical parameter of said at least one quality parameter; and

d) arranging said modes in said lookup table based on said first-order statistical parameter and based on said second-order statistical parameter.

16. The storage medium of claim 15, further comprising instructions for:

a) selecting a communication parameter;

b) setting a target value of said communication parameter; and

c) arranging said modes in said lookup table based on said target value.

17. The storage medium of claim 16, further comprising instructions for:

a) measuring a measured value of said communication parameter in said wireless communication channel; and

b) assigning an adjustment to at least one of said first-order statistical parameter and said second-order statistical parameter based on a difference between said measured value and said target value.

18. A storage medium according to claim 15, wherein the second-order statistical parameter is a variance of the quality parameter.

19. A storage medium according to claim 18, wherein the communication channel is a multi-carrier communication channel, and the second-order statistical parameter is a frequency variance of the quality parameter.

20. A receiver comprising:

a quality parameter statistics computation block to select at least one short-term quality parameter associated with the communication channel as received by said receive unit, to determine a first-order statistical parameter of said at least one quality parameter, and to determine a second-order statistical parameter of said at least one quality Parameter; and

a mode selection block, responsive to the Quality parameter statistics computation block, to arrange said modes in said lookup table based on said first-order statistical parameter and based on said second-order statistical parameter.

21. A receiver according to claim 20, wherein the receiver resides in a client device communicatively coupled to a wireless communications network through a multi-carrier communication channel.

22. A receiver according to claim 21, wherein the second-order statistical parameter is a frequency variance of the multi-carrier wireless communication channel.

23. A receiver according to claim 21, wherein the mode selection block selects a communication parameter, generates a target value of said communication parameter, and arranges the modes in said lookup table based on said target value.

24. A receiver according to claim 23, wherein the mode selection block measures a value of said communication parameter in said wireless communication channel, and develops an adjustment to at least one of said first-order statistical parameter and said second-order statistical parameter based on a difference between said measured value and said target value.

25. A system comprising:

one or more substantially omnidirectional antennae(e), through which a wireless communication channel with a remote device is selectively established;

a quality parameter statistics computation block, responsive to the communication channel received via the antenna(e), to select at least one short-term quality parameter associated with the communication channel as received by said receive unit, to determine a first-order statistical parameter of said at least one quality parameter, and to determine a second-order statistical parameter of said at least one quality parameter; and

a mode selection block, responsive to the quality parameter statistics communication block, to arrange said modes in said lookup table based on said first-order statistical parameter and based on said second-order statistical parameter.

26. A system according to claim 25, wherein the communication channel is a multi-carrier communication channel.

27. A system according to claim 26, wherein the second-order statistical parameter is a frequency variance of the multi-carrier wireless communication channel.

28. A system according to claim 25, wherein the mode selection block selects a communication parameter, generates a target value of said communication parameter, and arranges the modes in said lookup table based on said target value.

29. A system according to claim 28, wherein the mode selection block measures a value of said communication parameter in said wireless communication channel, and develops an adjustment to at least one of said first-order statistical parameter and said second-order statistical parameter based on a difference between said measured value and said target value.