Method, system and apparatus for transmit diversity control

• US 20080160922A1
• Filed: 12/27/2006
• Published: 07/03/2008
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Magnolia Broadband Incorporated
• Inventors: Karmi, Yair, Sun, Wei
• Granted Patent: US 8,027,374 B2
• Time in Patent Office: Days
• US Class Current: 455/67.14
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme

Abstract

A method, apparatus and system for modifying a transmit diversity signal by receiving at least one input parameter, collecting at least one interval of feedback data, computing a transmit diversity parameter, and modifying a transmit diversity signal based on the computed parameter. In some embodiments of the invention, the diversity parameter may be any one or a combination of relative phase, relative amplitude, relative power, data rate of the transmit diversity signal, or any other suitable parameter.

Claims

1. A method of modifying a transmit diversity signal comprising:

transmitting during a first transmission period a transmit diversity signal using a first transmit diversity parameter value;

during a first data collection period, receiving from a receiver a first plurality of quality indication signals pertaining to system performance using said first transmit diversity parameter value, wherein said first data collection period begins after the start of the first transmission period; and

calculating a subsequent transmit diversity parameter value based on said first plurality of quality indication signals.

2. The method of claim 1, wherein said first data collection period ends substantially contemporaneously with the end of said first transmission period.

3. The method of claim 1, wherein said first data collection period ends after the end of said first transmission period.

4. The method of claim 1, further comprising:

transmitting during a second transmission period immediately subsequent to said first transmission period, a transmit diversity signal using a second transmit diversity parameter value; and

during a second data collection period, receiving from a receiver a second plurality of quality indication signals pertaining to system performance using said second transmit diversity parameter value, wherein said second data collection period begins after the start of the second transmission period.

5. The method of claim 4, wherein said first data collection period ends after the end of said first transmission period, and wherein said second data collection period begins substantially immediately after the end of said first data collection period.

6. The method of claim 4, wherein said second transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.

7. The method of claim 4, further comprising:

transmitting during a third transmission period subsequent to said second transmission period, a transmit diversity signal using a third transmit diversity parameter value,

wherein said third transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.

8. An apparatus for modifying a transmit diversity signal comprising:

a transmitter to transmit during a first transmission period a transmit diversity signal using a first transmit diversity parameter value;

a receiver to receive during a first data collection period a first plurality of quality indication signals pertaining to system performance using said first transmit diversity parameter value, wherein said first data collection period begins after the start of the first transmission period; and

a processor to calculate a subsequent transmit diversity parameter value based on said first plurality of quality indication signals.

9. The apparatus of claim 8, wherein said first data collection period ends substantially contemporaneously with the end of said first transmission period.

10. The apparatus of claim 8, wherein said first data collection period ends after the end of said first transmission period.

11. The apparatus of claim 8, wherein said transmitter is further to transmit during a second transmission period immediately subsequent to said first transmission period, a transmit diversity signal using a second transmit diversity parameter value, and wherein during a second data collection period said receiver is to receive a second plurality of quality indication signals pertaining to system performance using said second transmit diversity parameter value, wherein said second data collection period begins after the start of the second transmission period.

12. The apparatus of claim 11, wherein said first data collection period ends after the end of said first transmission period, and wherein said second data collection period begins substantially immediately after the end of said first data collection period.

13. The apparatus of claim 11, wherein said second transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.

14. The apparatus of claim 11, wherein said transmitter is further to transmit during a third transmission period subsequent to said second transmission period, a transmit diversity signal using a third transmit diversity parameter value, and wherein said third transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.

15. A system for modifying a transmit diversity signal comprising:

a transmitting communication device including a transmitter to transmit during a first transmission period a transmit diversity signal using a first transmit diversity parameter value, a receiver to receive during a first data collection period a first plurality of quality indication signals pertaining to system performance using said first transmit diversity parameter value, wherein said first data collection period begins after the start of the first transmission period and a processor to calculate a subsequent transmit diversity parameter value based on said first plurality of quality indication signals; and

a feedback communication device including a receiver to receive said transmit diversity signal using said first transmit diversity parameter value and a transmitter to transmit said first plurality of quality indication signals pertaining to system performance using said first transmit diversity parameter value.

16. The system of claim 15, wherein said first data collection period ends substantially contemporaneously with the end of said first transmission period.

17. The system of claim 15, wherein said first data collection period ends after the end of said first transmission period.

18. The system of claim 15, wherein the transmitter of said transmitting communication device is further to transmit during a second transmission period immediately subsequent to said first transmission period, a transmit diversity signal using a second transmit diversity parameter value, and wherein during a second data collection period the receiver of said transmitting communication device is to receive a second plurality of quality indication signals pertaining to system performance using said second transmit diversity parameter value, wherein said second data collection period begins after the start of the second transmission period.

19. The system of claim 18, wherein said first data collection period ends after the end of said first transmission period, and wherein said second data collection period begins substantially immediately after the end of said first data collection period.

20. The system of claim 18, wherein said second transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.

21. The system of claim 18, wherein the transmitter of said transmitting communication device is further to transmit during a third transmission period subsequent to said second transmission period, a transmit diversity signal using a third transmit diversity parameter value, and wherein said third transmit diversity parameter is the transmit diversity parameter value calculated based on said first plurality of quality indication signals.