Average EIRP control of multiple antenna transmission signals

• US 20070046539A1
• Filed: 08/31/2005
• Published: 03/01/2007
• Est. Priority Date: 08/31/2005
• Status: Active Grant

• Current Assignee: Novanta Inc.
• Original Assignee: TZero Technologies Incorporated (Novanta Inc.)
• Inventors: Mani, Sanjay, Schwartz, Adam
• Granted Patent: US 7,248,217 B2
• Time in Patent Office: Days
• US Class Current: 342/383
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A method of controlling multiple antenna signal transmission is disclosed. The method includes adjusting signal parameters so that transmission signals from a plurality of antennas combine to form a directional beam. A time duration in which the transmission signals are directed is controlled so that an average EIRP does not exceed a predetermined threshold.

Claims

1. A method of controlling multiple antenna signal transmission, comprising:

adjusting signal parameters so that transmission signals from a plurality of antennas combine to form a directional beam;

controlling a time duration in which the transmission signals are adjusted so that an average EIRP does not exceed a predetermined threshold.

2. The method of claim 1, wherein the beam is directed to a receiver.

3. The method of claim 2, further comprising:

adjusting signal parameters so that transmission signals from the plurality of antennas form a beam that is directed on a different one of a plurality of receivers;

controlling a time duration in which the transmission signals are directed so that an average EIRP of the beam does not exceed the predetermined threshold.

4. The method of claim 1, wherein each of the plurality of antennas radiate a transmission signal, the combination of the radiated transmission signals forming a beam.

5. The method of claim 1, wherein the multiple antennas are located on a single common transmitter.

6. The method of claim 1, wherein a sum of conducted powers of the transmission signals into the antennas does not increase when increasing the number of antennas used to form the beam.

7. The method of claim 1, wherein the signal parameters are adjusted by adjusting a relative phase between transmission signals of the antennas.

8. The method of claim 1, wherein the signal parameters are adjusted by adjusting a relative amplitude between transmission signals of the antennas.

9. The method of claim 1, wherein the time duration is controlled by controlling an amount of time a relative phase between transmission signals is maintained.

10. The method of claim 1, further comprising N relative phase settings between the transmission signals, and the time duration being controlled by controlling an amount of time each of the relative phase settings between transmission signals is maintained.

11. The method of claim 1, wherein the plurality of antennas that are directed are a subset of available antennas, the subset of antennas being selected over other subsets of antennas because the selected subset provides a better transmission link to a particular receiver than other available subsets of antennas.

12. The method of claim 11, wherein the selected subset of antennas are selected through transmission diversity.

13. The method of claim 11, further comprising:

selecting a second subset of available antennas, the second subset of antennas being selected over other subsets of antennas because the selected second subset provides a better transmission link to a particular second receiver than other available subsets of antennas;

adjusting signal parameters so that second transmission signals from second subset of antennas combine to form a second directional beam;

controlling a time duration in which the second transmission signals are adjusted so that an average EIRP does not exceed a predetermined threshold.

14. A method of controlling multiple antenna signal transmission, comprising:

setting transmission duty cycle;

adjusting signal parameters based on the transmission duty cycle so that transmission signals from a plurality of antennas combine to form a directional beam having an average EIRP that does not exceed a predetermined threshold.

15. The method of claim 14, wherein the signal parameters are adjusted by adjusting a relative phase between transmission signals of the antennas.

16. The method of claim 14, wherein the duty cycle is controlled by controlling an amount of time a relative phase between transmission signals is maintained.

17. The method of claim 14, further comprising N relative phase settings between the transmission signals, and the duty cycle controlling an amount of time each of the relative phase settings between transmission signals is maintained.

18. The method of claim 14, wherein adjusting the signal parameters comprises forming a directional beam during an “

active”

portion of the transmission duty cycle, and ceasing transmission during an “

inactive”

portion of the transmission duty cycle.

19. A method of controlling transmission signals between transceivers of a mesh network, the method comprising:

for each transceiver, adjusting signal parameters so that transmission signals from a plurality of antennas combine to form a beam that is directed towards a particular other transceiver;

controlling a time duration in which the transmission signals are directed so that an average EIRP does not exceed a predetermined threshold.

20. The method of claim 19, wherein the time duration is controlled by a transmission scheduler that allocates time slots in which each transceiver transmits to other transceivers, the time duration being determined by the number of time slots allocated for transmission.

21. The method of claim 19, wherein the signal parameters are adjusted by adjusting a relative phase between transmission signals of the antennas.

22. The method of claim 19, wherein the signal parameters are adjusted by adjusting a relative amplitude between transmission signals of the antennas.

23. The method of claim 19, wherein the time duration is controlled by controlling an amount of time a relative phase between transmission signals is maintained.

24. The method of claim 19, further comprising N phase relative phase settings between the transmission signals, and the time duration being controlled by controlling an amount of time the relative phase settings between transmission signals is maintained.

25. The method of claim 19, wherein the plurality of antennas that are directed are a subset of available antennas, the subset of antennas are selected for providing a beam having transmission quality characteristics that are better than other subsets of available antennas.

26. A transceiver comprising:

a plurality of antennas;

means for controlling an antenna pattern generated by a sum of radiated signals from the antennas by adjusting signal parameters of input signals to the antennas so that transmission signals from a plurality of antennas combine to form a directional beam;

means for controlling a time duration in which the transmission signals are directed so that an average EIRP does not exceed a predetermined threshold.

27. The transceiver of claim 26, further comprising:

means for adjusting signal parameters so that transmission signals from the plurality of antennas form a beam that is directed to one of a plurality of receivers;

means for controlling a time duration in which the transmission signals are directed so that an average EIRP of the beam does not exceed the predetermined threshold.

28. The transceiver of claim 27, wherein the time duration is controlled by controlling an amount of time a relative phase between transmission signals is maintained.