Transceiver array with adjustment of local oscillator signals based on phase difference

Patent metadata

Field	Value
Publication number	US-10135522-B2
Application number	US-201715802238-A
Country	US
Kind code	B2
Filing date	Nov 2, 2017
Priority date	Aug 18, 2015
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

Aspects of methods and systems for transceiver array synchronization are provided. An array based communications system comprises a plurality of transceiver circuits and an array coordinator. Each transceiver circuit of the plurality of transceiver circuits comprises a plurality of wireless transmitters and a local oscillator generator. Each wireless transmitter of the plurality of wireless transmitters is able to modulate a local oscillator signal from the local oscillator generator based on a weighted sum of a plurality of digital datastreams. The array coordinator is able to adjust a phase of a first local oscillator signal based on a phase difference between the first local oscillator signal and a second local oscillator signal. The first local oscillator signal is generated by a first local oscillator generator of a first transceiver circuit. The second local oscillator signal is generated by a second local oscillator generator of a second transceiver circuit.

First claim

What is claimed is:

1. An array based communications system comprising:
a first local oscillator generator operable to generate a first local oscillator signal;
a first plurality of mixers operable to generate a first plurality of mixer outputs according to the first local oscillator signal;
a second local oscillator generator operable to generate a second local oscillator signal;
a second plurality of mixers operable to generate a second plurality of mixer outputs according to the second local oscillator signal; and
an array coordinator operable to adjust a phase of the first local oscillator signal based on a phase difference between the first local oscillator signal and the second local oscillator signal, wherein the phase difference between the first local oscillator signal and the second local oscillator signal is an average phase difference between the first plurality of mixer outputs and the second plurality of mixer outputs.

2. The array based communications system of claim 1 , wherein each mixer of the first plurality of mixers is operable to generate a mixer output by modulating the first local oscillator signal according to a weighted sum of a plurality of digital datastreams.

3. The array based communications system of claim 1 , wherein each mixer of the second plurality of mixers is operable to generate a mixer output by modulating the second local oscillator signal according to a weighted sum of a plurality of digital datastreams.

4. The array based communications system of claim 1 , comprising:
a phase differencing circuit operable to generate the phase difference between the first local oscillator signal and the second local oscillator signal, the differencing circuit comprising a mixer, a filter, and an analog-to-digital converter.

5. The array based communications system of claim 4 , wherein the phase differencing circuit operates at start up.

6. The array based communications system of claim 4 , wherein the phase differencing circuit operates periodically.

7. The array based communications system of claim 4 , wherein the phase differencing circuit operates on an event driven basis.

8. The array based communications system of claim 4 , wherein the phase differencing circuit operates in response to an error rate exceeding a threshold.

9. The array based communications system of claim 4 , wherein the phase differencing circuit is in a low power state while not operating.

10. A method for array based communications comprising:
generating a first local oscillator signal by using a first local oscillator generator;
generating a first plurality of mixer outputs by using a first plurality of mixers and the first local oscillator signal;
generating a second local oscillator signal by using a second local oscillator generator;
generating a second plurality of mixer outputs by using a second plurality of mixers and the second local oscillator signal; and
adjusting a phase of the first local oscillator signal by using an array coordinator and a phase difference between the first local oscillator signal and the second local oscillator signal, wherein the phase difference between the first local oscillator signal and the second local oscillator signal is an average phase difference between the first plurality of mixer outputs and the second plurality of mixer outputs.

11. The method for array based communications of claim 10 , wherein generating each mixer output of the first plurality of mixer outputs comprises modulating the first local oscillator signal according to a weighted sum of a plurality of digital datastreams.

12. The method for array based communications of claim 10 , wherein generating each mixer output of the second plurality of mixer outputs comprises modulating the second local oscillator signal according to a weighted sum of a plurality of digital datastreams.

13. The method for array based communications of claim 10 , wherein the method comprises generating the phase difference between the first local oscillator signal and the second local oscillator signal using a mixer, a filter, and an analog-to-digital converter.

14. The method for array based communications of claim 13 , wherein the phase difference is generated at start up.

15. The method for array based communications of claim 13 , wherein the phase difference is generated periodically.

16. The method for array based communications of claim 13 , wherein the phase difference is generated on an event driven basis.

17. The method for array based communications of claim 13 , wherein the phase difference is generated in response to an error rate exceeding a threshold.

18. The method for array based communications of claim 13 , wherein the mixer, the filter, and the analog-to-digital converter are in a low power state when the phase difference is not being generated.

19. An array based communications system comprising:
a first local oscillator generator operable to generate a first local oscillator signal;
a first plurality of mixers operable to generate a first plurality of mixer outputs according to the first local oscillator signal;
a second local oscillator generator operable to generate a second local oscillator signal;
a second plurality of mixers operable to generate a second plurality of mixer outputs according to the second local oscillator signal;
an array coordinator operable to adjust a phase of the first local oscillator signal based on a phase difference between the first local oscillator signal and the second local oscillator signal; and
a phase differencing circuit operable to generate the phase difference between the first local oscillator signal and the second local oscillator signal, the differencing circuit comprising a mixer, a filter, and an analog-to-digital converter, wherein the phase differencing circuit operates in response to an error rate exceeding a threshold.

20. The array based communications system of claim 19 , wherein each mixer of the first plurality of mixers is operable to generate a mixer output by modulating the first local oscillator signal according to a weighted sum of a plurality of digital datastreams.

21. The array based communications system of claim 19 , wherein each mixer of the second plurality of mixers is operable to generate a mixer output by modulating the second local oscillator signal according to a weighted sum of a plurality of digital datastreams.

22. The array based communications system of claim 19 , wherein the phase differencing circuit operates at start up.

23. The array based communications system of claim 19 , wherein the phase differencing circuit operates periodically.

24. The array based communications system of claim 19 , wherein the phase differencing circuit operates on an event driven basis.

25. The array based communications system of claim 19 , wherein the phase differencing circuit is in a low power state while not operating.

26. A method for array based communications comprising:
generating a first local oscillator signal by using a first local oscillator generator;
generating a first plurality of mixer outputs by using a first plurality of mixers and the first local oscillator signal;
generating a second local oscillator signal by using a second local oscillator generator;
generating a second plurality of mixer outputs by using a second plurality of mixers and the second local oscillator signal; and
adjusting a phase of the f

Assignees

• Maxlinear Inc

Inventors

• Gallagher Timothy
• Ling Curtis

Classifications

• H04B17/11

  for calibration · CPC title

• H04B1/38

  Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving · CPC title

• H04B17/18

  Monitoring during normal operation · CPC title

• H04B7/18513 Primary

  Transmission in a satellite or space-based system · CPC title

• H04B1/04

  Circuits · CPC title