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

• US 20020056066A1
• Filed: 12/05/2000
• Published: 05/09/2002
• Est. Priority Date: 09/19/2000
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Gesbert, David J., Catreux, Severine E., Heath, Robert W. Jr.
• Granted Patent: US 7,191,381 B2
• Time in Patent Office: Days
• 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 quality parameter of said data 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 selected from the group consisting of bit error rate, packet error rate, data capacity, signal quality, spectral efficiency and throughput.

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

7. 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.

8. The method of claim 1, wherein said quality parameter is a short-term quality parameter.

9. The method of claim 8, wherein said second-order statistical parameter comprises a variance of said short-term quality parameter.

10. The method of claim 9, wherein said variance is selected from the group consisting of temporal variance and frequency variance.

11. The method of claim 8, 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.

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

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

14. The method of claim 13, wherein said data is transmitted at more than one frequency and said variance is a frequency variance.

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

16. The method of claim 13, wherein said variance is a temporal variance.

17. The method of claim 1, wherein said transmitting step is performed in accordance with a transmission technique selected from the group consisting of OFDMA, FDMA, CDMA, TDMA.

19. The storage medium of claim 18, 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.

20. The storage medium of claim 19, further comprising instructions for:

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.

18. 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 quality parameter of said data as received by said receive unit;

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

p1 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.