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1. WO2020163881 - APPAREIL ET PROCÉDÉS DE RÉCEPTION DE SIGNAUX À L'AIDE D'UNE LENTILLE OPTIQUE EN TANT QUE FORMEUR DE FAISCEAUX

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A communication apparatus, comprising:

a switch matrix comprising a plurality of input ports and a plurality of output ports, the switch matrix configured to:

receive, at a first input port of the plurality of input ports, a first electrical signal, the first electrical signal corresponding to a transmission signal received at antennas of an antenna array, the transmission signal corresponding to a first transmission spatial sector of the antenna array, the first electrical signal comprising a first signal portion in a first frequency band and a second signal portion in a second frequency band, the first electrical signal having been generated from a first optical signal that corresponds to the transmission signal received at the antennas of the antenna array; and

direct, via a first output port of the plurality of output ports and in accordance with a first control signal, the first electrical signal to a first signal conversion path of a plurality of signal conversion paths; and

frequency band isolation circuitry in the first signal conversion path, the frequency band isolation circuitry configured to:

separate the first electrical signal into the first signal portion in the first frequency band and the second signal portion in the second frequency band;

modulate a reference signal with the second signal portion to generate a frequency-shifted second signal portion; and

combine the first signal portion and the frequency -shifted second signal portion to generate a modified first electrical signal that corresponds to the transmission signal received at the antennas of the antenna array.

2. The communication apparatus of Claim 1, wherein the frequency band isolation circuitry comprises:

a first filter configured to separate the first signal portion in the first frequency band from the first electrical signal; and

a second filter configured to separate the second signal portion in the second frequency band from the first electrical signal.

3. The communication apparatus of any of Claims 1-2, wherein the frequency band isolation circuitry further comprises:

a modulator configured to modulate the reference signal with the second signal portion to generate the frequency-shifted second signal portion; and

a summer configured to combine the first signal portion and the frequency-shifted second signal portion to generate the modified first electrical signal by adding the first signal portion and the frequency-shifted second signal portion.

4. The communication apparatus of any of Claims 1-3, further comprising an analog-to-digital converter in the first signal conversion path, the analog-to-digital converter configured to convert the modified first electrical signal to a digital format.

5. The communication apparatus of any of Claims 1-4, further comprising an optical lens adapted to transform a plurality of second optical signals from a first wave format to a second wave format, each second optical signal corresponding to a respective antenna of the antenna array, the first optical signal resulting from the plurality of second optical signals in the second wave format and comprising a combination of the plurality of second optical signals.

6. The communication apparatus of Claim 5, wherein the plurality of second optical signals are emitted in the first wave format by respective first optical fibers of a first plurality of optical fibers, each optical fiber of the first plurality of optical fibers corresponding to a respective antenna of the antenna array.

7. The communication apparatus of any of Claims 5-6, wherein a first optical fiber of a second plurality of optical fibers is adapted to receive the plurality of second optical signals in the second wave format as a portion of the first optical signal.

8. The communication apparatus of any of Claims 1-7, further comprising a signal conversion circuit configured to:

receive the first optical signal via the first optical fiber of the second plurality of optical fibers; and

convert the first optical signal into the first electrical signal.

9. The communication apparatus of Claim 8, wherein the signal conversion circuit comprises a photodiode.

10. The communication apparatus of any of Claims 1-9, wherein a quantity of the first plurality of optical fibers is the same as a quantity of the second plurality of optical fibers.

11. The communication apparatus of any of Claims 1-10, further comprising a plurality of modulators each corresponding to a respective antenna of the antenna array and configured to modulate an optical source signal with the transmission signal received by the antenna corresponding to the modulator to generate the second optical signal.

12. The communication apparatus of any of Claims 1-11, wherein processing is performed on the transmission signal prior to the modulator modulating the transmission signal with the optical source signal to generate the second optical signal.

13. The communication apparatus of Claim 12, wherein the processing that is performed on the transmission signal comprises:

filtering the transmission signal;

amplifying the transmission signal; or

filtering and amplifying the transmission signal.

14. The communication apparatus of any of Claims 1-13, wherein:

the switch matrix and the frequency band isolation circuitry are located in a baseband unit (BBU); and

the antenna array is located in a remote receiver unit (RRU).

15. The communication apparatus of any of Claims 1-14, wherein second optical signals are communicated from the RRU to the BBU via respective optical fibers, the second optical signals corresponding to respective antennas of the antenna array.

16. The communication apparatus of any of Claims 1-15, wherein the transmission signal comprises a radio frequency (RF) signal.

17. The communication apparatus of any of Claims 1-16, wherein:

the transmission signal comprises data for a plurality of users in the first transmission spatial sector; and

the first electrical signal comprises the data for the plurality of users in the first transmission spatial sector.

18. The communication apparatus of any of Claims 1-17, wherein the switch matrix is further configured to:

compare a signal strength of the first electrical signal to a signal threshold; and

direct, via the first output port of the plurality of output ports, the first electrical signal to the first signal conversion path at least in part in response to the signal strength of the first electrical signal exceeding the signal threshold.

19. The communication apparatus of any of Claims 1-17, further comprising:

a grid modulator configured to:

receive a plurality of electrical signals, each electrical signal in the plurality of electrical signals corresponding to a respective antenna of the antenna array, the first electrical signal being one of the plurality of electrical signals;

modulate each of the plurality of electrical signals to generate a corresponding plurality of optical signals; and

a first arrayed waveguide grating element configured to multiplex the plurality optical signals into a multiplexed optical signal for transmission via one or more optical fibers, wherein a quantity of the one or more optical fibers is less than a quantity of the plurality of optical signals.

20. The communication apparatus of Claim 19, further comprising a second arrayed waveguide grating element configured to:

receive, via the one or more optical fibers, the multiplexed optical signal; and

demultiplex the multiplexed optical signal into the plurality of optical signals for conversion, by respective signal conversion circuits, into the plurality electrical signals to which the plurality of optical signals correspond, the first electrical signal being one of the plurality of electrical signals.

21. The communication apparatus of any of Claims 19-20, wherein a quantity of the one or more first optical fibers is one.

22. The communication apparatus of any of Claims 19-21, wherein:

the grid modulator and the first arrayed waveguide grating element are located in a remote receiver unit (RRU);

the second arrayed waveguide grating element is located in a baseband unit (BBU).

23. A method, comprising:

receiving, at a first input port of a plurality of input ports of a switch matrix, a first electrical signal, the first electrical signal corresponding to a transmission signal received at antennas of an antenna array, the transmission signal corresponding to a first transmission spatial sector of the antenna array, the first electrical signal comprising a first signal portion in a first frequency band and a second signal portion in a second frequency band, the first electrical signal having been generated from a first optical signal that corresponds to the transmission signal received at the antennas of the antenna array;

directing, via a first output port of a plurality of output ports of the switch matrix and in accordance with a first control signal, the first electrical signal to a first signal conversion path of a plurality of signal conversion paths;

separating, by frequency band isolation circuitry in the first signal conversion path, the first electrical signal into the first signal portion in the first frequency band and the second signal portion in the second frequency band;

modulating, by the frequency band isolation circuitry in the first signal conversion path, a reference signal with the second signal portion to generate a frequency-shifted second signal portion; and

combining, by the frequency band isolation circuitry in the first signal conversion path, the first signal portion and the frequency-shifted second signal portion to generate a modified first electrical signal that corresponds to the transmission signal received at the antennas of the antenna array.

24. The method of Claim 23, further comprising:

separating, by a first filter of the frequency band isolation circuitry, the first signal portion in the first frequency band from the first electrical signal; and

separating, by a second filter of the frequency band isolation circuitry, the second signal portion in the second frequency band from the first electrical signal.

25. The method of any of Claims 23-24, further comprising:

modulating, by a modulator of the frequency band isolation circuitry, the reference signal with the second signal portion to generate the frequency- shifted second signal portion; and

combining, by a summer of the frequency band isolation circuitry, the first signal portion and the frequency-shifted second signal portion to generate the modified first electrical signal by adding the first signal portion and the frequency-shifted second signal portion.

26. The method of any of Claims 23-25, further comprising converting, by an analog-to-digital converter in the first signal conversion path, the modified first electrical signal to a digital format.

27. The method of any of Claims 23-26, further comprising transforming a plurality of second optical signals from a first wave format to a second wave format, each second optical signal corresponding to a respective antenna of the antenna array, the first optical signal resulting from the plurality of second optical signals in the second wave format and comprising a combination of the plurality of second optical signals.

28. The method of Claim 27, wherein the plurality of second optical signals are emitted in the first wave format by respective first optical fibers of a first plurality of optical fibers, each optical fiber of the first plurality of optical fibers corresponding to a respective antenna of the antenna array.

29. The method of any of Claims 27-28, further comprising receiving, by a first optical fiber of a second plurality of optical fibers, the plurality of second optical signals in the second wave format as a portion of the first optical signal.

30. The method of any of Claims 23-29, further comprising:

receiving, by a signal conversion circuit, the first optical signal via the first optical fiber of the second plurality of optical fibers; and

converting, by the signal conversion circuit, the first optical signal into the first electrical signal.

31. The method of Claim 30, wherein the signal conversion circuit comprises a photodiode.

32. The method of any of Claims 23-31, wherein a quantity of the first plurality of optical fibers is the same as a quantity of the second plurality of optical fibers.

33. The method of any of Claims 23-32, further comprising modulating, by each of a plurality of modulators that each correspond to a respective antenna of the antenna array, an optical source signal with the transmission signal received by the antenna corresponding to the modulator to generate the second optical signal.

34. The method of any of Claims 23-33, further comprising performing processing on the transmission signal prior to the modulator modulating the transmission signal with the optical source signal to generate the second optical signal.

35. The method of Claim 34, wherein the processing that is performed on the transmission signal comprises:

filtering the transmission signal;

amplifying the transmission signal; or

filtering and amplifying the transmission signal.

36. The method of any of Claims 23-35, wherein:

the switch matrix and the frequency band isolation circuitry are located in a baseband unit (BBU); and

the antenna array is located in a remote receiver unit (RRU).

37. The method of any of Claims 23-36, wherein second optical signals are communicated from the RRU to the BBU via respective optical fibers, the second optical signals corresponding to respective antennas of the antenna array.

38. The method of any of Claims 23-37, wherein the transmission signal comprises a radio frequency (RF) signal.

39. The method of any of Claims 23-38, wherein:

the transmission signal comprises data for a plurality of users in the first transmission spatial sector; and

the first electrical signal comprises the data for the plurality of users in the first transmission spatial sector.

40. The method of any of Claims 23-39, further comprising:

comparing, by the switch matrix, a signal strength of the first electrical signal to a signal threshold; and

directing, by the switch matrix via the first output port of the plurality of output ports, the first electrical signal to the first signal conversion path at least in part in response to the signal strength of the first electrical signal exceeding the signal threshold.

41. The method of any of Claims 23-40, further comprising:

receiving, by a grid modulator, a plurality of electrical signals, each electrical signal in the plurality of electrical signals corresponding to a respective antenna of the antenna array, the first electrical signal being one of the plurality of electrical signals;

modulating, by the grid modulator, each of the plurality of electrical signals to generate a corresponding plurality of optical signals; and

multiplexing, by a first arrayed waveguide grating element, the plurality optical signals into a multiplexed optical signal for transmission via one or more optical fibers, wherein a quantity of the one or more optical fibers is less than a quantity of the plurality of optical signals.

42. The method of Claim 41, further comprising:

receiving, by a second arrayed waveguide grating element, via the one or more optical fibers, the multiplexed optical signal; and

demultiplexing, by the second arrayed waveguide grating element, the multiplexed optical signal into the plurality of optical signals for conversion, by respective signal conversion circuits, into the plurality electrical signals to which the plurality of optical signals correspond, the first electrical signal being one of the plurality of electrical signals.

43. The method of any of Claims 41-42, wherein a quantity of the one or more first optical fibers is one.

44. The method of any of Claims 41-43, wherein:

the grid modulator and the first arrayed waveguide grating element are located in a remote receiver unit (RRU);

the second arrayed waveguide grating element is located in a baseband unit (BBU).

45. An apparatus, comprising:

means for receiving, at a first input port of a plurality of input ports of a switch matrix, a first electrical signal, the first electrical signal corresponding to a transmission signal received at antennas of an antenna array, the transmission signal corresponding to a first transmission spatial sector of the antenna array, the first electrical signal comprising a first signal portion in a first frequency band and a second signal portion in a second frequency band, the first electrical signal having been generated from a first optical signal that corresponds to the transmission signal received at the antennas of the antenna array;

means for directing, via a first output port of a plurality of output ports of the switch matrix and in accordance with a first control signal, the first electrical signal to a first signal conversion path of a plurality of signal conversion paths;

means for separating, by frequency band isolation circuitry in the first signal conversion path, the first electrical signal into the first signal portion in the first frequency band and the second signal portion in the second frequency band;

means for modulating, by the frequency band isolation circuitry in the first signal conversion path, a reference signal with the second signal portion to generate a frequency-shifted second signal portion; and

means for combining, by the frequency band isolation circuitry in the first signal conversion path, the first signal portion and the frequency-shifted second signal portion to generate a modified first electrical signal that corresponds to the transmission signal received at the antennas of the antenna array.