METHOD, SYSTEM AND APPARATUS FOR THE CONROL OF TRANSMIT DIVERSITY

• US 20140140441A1
• Filed: 01/28/2014
• Published: 05/22/2014
• Est. Priority Date: 12/12/2006
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: ABREU, Eduardo, KARMI, Yair
• Granted Patent: US 9,281,966 B2
• Time in Patent Office: Days
• US Class Current: 375/316
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54

Abstract

A method, apparatus and system for modifying a transmit diversity signal comprising receiving at least one input parameter, calculating at least one virtual parameter based on the at least one input parameter, converting the at least one virtual parameter into an actual parameter, and modifying a transmit diversity signal based on the actual parameter. Variations of the invention are possible, including mapping the input parameter to an actual parameter by various methods, for example, quantization, hysteresis and other methods. Embodiments of the invention may include an apparatus adapted to modify a transmit diversity signal comprising a processor to calculate at least one virtual parameter based on at least one input parameter, convert said at least one virtual parameter to an actual parameter, and modify said transmit diversity signal based on said actual parameter.

Claims

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

receiving at least one input parameter;

calculating at least one virtual parameter based on said at least one input parameter;

converting said at least one virtual parameter into an actual parameter; and

modifying a transmit diversity signal based on said actual parameter.

2. The method of claim 1, wherein said actual parameter comprises a parameter selected from the group consisting of:

relative phase, relative amplitude, relative power, frequency of modification, and timing of application of said transmit diversity signal.

3. The method of claim 1, wherein said actual parameter has a discrete value having lower resolution than said virtual parameter.

4. The method of claim 3, wherein converting said at least one virtual parameter into said actual parameter comprises mapping any of a plurality of virtual parameter values to a single actual parameter value.

5. The method of claim 4, wherein converting said at least one virtual parameter into said actual parameter comprises truncating said virtual parameter to obtain said actual parameter value.

6. The method of claim 4, wherein converting said at least one virtual parameter into said actual parameter comprises rounding said virtual parameter to obtain said actual parameter value.

7. The method of claim 1, wherein converting said at least one virtual parameter into said actual parameter comprises performing a calculation based on an amount of change in said virtual parameter over a slope-measurement time interval.

8. The method of claim 7, wherein converting said at least one virtual parameter into said actual parameter comprises determining whether an increase in said virtual parameter over the slope-measurement time interval exceeds a threshold value.

9. The method of claim 7, wherein converting said at least one virtual parameter into said actual parameter comprises determining whether the absolute value of a decrease in said virtual parameter over the slope-measurement time interval exceeds a threshold value.

10. The method of claim 7, wherein converting said at least one virtual parameter into said actual parameter further comprises converting said at least one virtual parameter into said actual parameter only if no change was made to said actual parameter within a previous minimum time interval.

11. The method of claim 7, wherein performing a calculation based on an amount of change in said virtual parameter over a slope-measurement time interval comprises performing a weighted averaging of a plurality of virtual parameter values over said slope-measurement time interval.

12. The method of claim 1, wherein converting said at least one virtual parameter into an actual parameter comprises determining whether a change in said at least one virtual parameter exceeds a threshold, wherein said threshold is based on at least one previous value of said virtual parameter.

13. The method of claim 1, wherein converting said at least one virtual parameter into an actual parameter comprises determining whether a change in said at least one virtual parameter exceeds a threshold, wherein said threshold is based on at least one previous value of said actual parameter.

14. The method of claim 1, wherein converting said at least one virtual parameter into said actual parameter comprises determining whether a difference between said virtual parameter and an actual parameter value exceeds a hysteresis threshold value.

15. The method of claim 1, wherein converting said at least one virtual parameter into said actual parameter comprises performing a weighted averaging of a plurality of previous virtual parameter values over a measurement time interval.

16. The method of claim 1, wherein converting said at least one virtual parameter into said actual parameter comprises performing a conversion calculation at regular time intervals.

17. The method of claim 1, wherein the timing of said converting said at least one virtual parameter into an actual parameter is based on a trigger function.

18. The method of claim 17, wherein said trigger function based on the lapse of a predetermined time interval.

19. The method of claim 17, wherein said trigger function is based on said at least one virtual parameter.

20. The method of claim 17, wherein said trigger function is based on at least one previous actual parameter.

21. An apparatus adapted to modify a transmit diversity signal comprising:

a processor to calculate at least one virtual parameter based on at least one input parameter, convert said at least one virtual parameter to an actual parameter, and modify said transmit diversity signal based on said actual parameter.

22. The apparatus of claim 21, wherein said actual parameter comprises a parameter selected from the group consisting of:

relative phase, relative amplitude, relative power, frequency of modification, and timing of application of said transmit diversity signal.

23. The apparatus of claim 21, wherein said actual parameter has a discrete value having lower resolution than said virtual parameter.

24. The apparatus of claim 23, wherein said processor is to convert said at least one virtual parameter into said actual parameter by mapping any of a plurality of virtual parameter values to a single actual parameter value.

25. The apparatus of claim 24, wherein said processor is to map any of said plurality of virtual parameter values to said single actual parameter value by truncating said virtual parameter to obtain said actual parameter value.

26. The apparatus of claim 24, wherein said processor is to map any of said plurality of virtual parameter values to said single actual parameter value by rounding said virtual parameter to obtain said actual parameter value.

27. The apparatus of claim 21, wherein said processor is to convert said at least one virtual parameter into said actual parameter by performing a calculation based on an amount of change in said virtual parameter over a slope-measurement time interval.

28. The apparatus of claim 27, wherein said processor is to determine whether an increase in said virtual parameter over the slope-measurement time interval exceeds a threshold value.

29. The apparatus of claim 27, wherein said processor is to determine whether the absolute value of a decrease in said virtual parameter over the slope-measurement time interval exceeds a threshold value.

30. The apparatus of claim 27, wherein said processor is to convert said at least one virtual parameter into said actual parameter only if no change was made to said actual parameter within a previous minimum time interval.

31. The apparatus of claim 27, wherein said processor is to perform a weighted averaging of a plurality of virtual parameter values over said slope-measurement time interval.

32. The apparatus of claim 21, wherein said processor is to determine whether said at least one virtual parameter exceeds a threshold, wherein said threshold is based on at least one previous value of said virtual parameter.

33. The apparatus of claim 21, wherein said processor is to determine whether said at least one virtual parameter exceeds a threshold, wherein said threshold is based on at least one previous value of said actual parameter.

34. The apparatus of claim 21, wherein said processor is to determine whether a difference between said virtual parameter and an actual parameter value exceeds a hysteresis threshold value.

35. The apparatus of claim 21, wherein said processor is to perform a weighted averaging of a plurality of previous virtual parameter values over a measurement time interval.

36. The apparatus of claim 21, wherein said processor is adapted to convert said at least one virtual parameter into said actual parameter at regular time intervals.

37. A transmit diversity method comprising:

modifying by a modification amount a transmit diversity signal parameter, said modification amount based on a calculation performed on at least one feedback parameter, wherein said modification is performed if a result of the calculation satisfies a threshold condition, and wherein said actual parameter is maintained if the result of said calculation does not satisfy the threshold condition.

38. The method of claim 37, wherein said transmit diversity parameter comprises a parameter selected from the group consisting of:

relative phase, relative amplitude, relative power, frequency of modification, and timing of application of said transmit diversity signal.

39. The method of claim 38, wherein said modification amount is a discrete parameter.

40. The method of claim 39, wherein said calculation includes quantizing the result of the calculation, and wherein said modification is performed if the result of the calculation exceeds a minimum value, and wherein said actual parameter is maintained if the result of said calculation does not exceed the minimum value.