Systems for communicating using multiple frequency bands in a wireless network

• US 20070091988A1
• Filed: 03/31/2006
• Published: 04/26/2007
• Est. Priority Date: 10/26/2005
• Status: Active Grant

• Current Assignee: Tahoe Research Limited (f/k/a Learndale Limited) (Vector Capital Corporation)
• Original Assignee: Intel Corporation
• Inventors: Maltsev, Alexander, Khoryaev, Alexey, Maslennikov, Roman, Sadri, Ali, Sergeyev, Vadim
• Granted Patent: US 7,653,163 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band

Abstract

Systems that communicate in a wireless network using a first and a second frequency band are described herein. The systems may use the first frequency band to transmit or receive a control signal, enabling subsequent communication using the second frequency band.

Claims

1. An apparatus, comprising:

a radio frequency (RF) filter block to selectively transmit or receive signals in a wireless network using a selected one of a first frequency band or a second frequency band, the first frequency band being a lower frequency band than the second frequency band; and

a controller coupled to the RF filter block to control the RF filter block to select the first frequency band to transmit or receive a control signal to facilitate initial communication by the apparatus in the wireless network, enabling subsequent communication by the apparatus using the second frequency band.

2. The apparatus of claim 1, wherein said controller is further adapted to control the RF filter block to select the second frequency band to transmit or receive a data signal in the wireless network, to facilitate said subsequent communication by the apparatus using the second frequency band.

3. The apparatus of claim 2, wherein said RF filter block comprises:

a first RF filter to pass filter a control signal for transmission or receipt in the first frequency band;

a second RF filter to pass filter a data signal for transmission or receipt in the second frequency band; and

a switch to selectively couple a control signal to the first RF filter or a data signal to the second RF filter.

4. The apparatus of claim 3, wherein said RF filter block further comprises a mixer coupled to the second RF filter to modulate or demodulate a data signal to be pass filtered by the second RF filter with a carrier signal to correspondingly facilitate said transmit or receive using the second frequency band.

5. The apparatus of claim 4, wherein said carrier signal is greater than about 20 GHz.

6. The apparatus of claim 3, wherein said RF filter block further comprises a mixer coupled to the switch to selectively provide or receive either said control or data signal to or from the switch, to facilitate said transmit or receive using the first and the second frequency bands, the mixer adapted to modulate or demodulate the control or data signal with a carrier signal having a first or a second frequency in the first or second frequency band, respectively.

7. The apparatus of claim 6, further comprising one or more frequency synthesizers coupled to the mixer to provide the carrier signals having the first and second frequencies.

8. The apparatus of claim 7, wherein said one or more frequency synthesizers are adapted to provide a first carrier signal having a frequency that is less than about 20 GHz and a second carrier signal having a frequency that is greater than about 20 GHz.

9. The apparatus of claim 1, wherein said apparatus further comprises another similarly constituted RF filter block coupled to the controller, with a first of the two RF filter blocks dedicated to said receiving of signals in the wireless network in said first or second frequency bands, and a second of the two RF filter blocks dedicated to said transmitting of signals in the wireless network in said first or second frequency bands, the controller respectively controlling the two RF filter blocks to select the first frequency band to transmit or receive a first control signal to facilitate initial communication by the apparatus in the wireless network using the second frequency band, to select the second frequency band to transmit or receive a second control signal to further facilitate communication by the apparatus using the second frequency band.

10. The apparatus of claim 1, further comprising one or more frequency synthesizers coupled to the RF filter block to selectively provide to the RF filter block a carrier signal in said first or second frequency band to facilitate said transmit or receive signals using the first and second frequency bands.

11. The apparatus of claim 10, wherein said one or more frequency synthesizers are adapted to provide a first carrier signal with a frequency that is less than about 20 GHz and a second carrier signal with a frequency that is greater than about 20 GHz.

12. An apparatus, comprising:

a radio frequency (RF) filter block to selectively transmit or receive signals in a wireless network using a selected one of a first frequency band or a second frequency band, the first frequency band being a lower frequency band than the second frequency band;

a pair of first and second inputs or a pair of first and second outputs coupled to the RF filter block to receive or output a pair of first and second signals, the first input or output adapted to receive or output in-phase signals, and the second input or output adapted to receive or output quadrature signals; and

a controller coupled to the RF filter block to control the RF filter block to select the first frequency band to transmit or receive a control signal to facilitate initial communication by the apparatus in the wireless network, enabling subsequent communication by the apparatus using the second frequency band.

13. The apparatus of claim 12, further comprising a pair of first and second digital-to-analog converters (DAC) or a pair of first and second analog-to-digital converters (ADC) coupled to the pair of first and second inputs or the pair of first and second outputs, respectively, to convert digital signals received through the pair of first and second inputs to analog signals or to convert analog signals to digital signals prior to outputting on the pair of first and second outputs.

14. The apparatus of claim 13, further comprising a first and a second filter-and-amplifier pair correspondingly coupled to the first and second DACs or to the first and second ADCs to pass filter and amplify signals outputted by the DACs or to be received by the ADCs.

15. The apparatus of claim 14, further comprising a first and a second mixer coupled to the first and the second filter-and-amplifier pair, respectively, to correspondingly modulate or demodulate signals to be outputted or received by the first and the second filter-and-amplifier pair with a first and a second carrier signal, respectively, the first and second carrier signals to be 90 degrees out-of-phase with each other.

16. The apparatus of claim 15, further comprising a 90 degree phase splitter coupled to first and second mixers to provide the first and second carrier signals to the first and second mixers, based on a third carrier signal.

17. The apparatus of claim 15, further comprising one or more frequency synthesizers coupled to the 90 degree phase splitter to provide the third carrier signal to the 90 degree phase splitter.

18. The apparatus of claim 17, wherein said one or more frequency synthesizers are further coupled to the RF filter block to provide to the RF filter block a fourth carrier signal, the fourth carrier signal having a higher frequency than the third carrier signal.

19. An apparatus, comprising:

circuitry including a radio frequency (RF) filter block to selectively transmit or receive signals in a wireless network using a selected one of a first frequency band or a second frequency band, the first frequency band being a lower frequency band than the second frequency band;

one or more frequency synthesizers coupled to the circuitry to provide a first and a second carrier signal to the circuitry, the first carrier signal having a frequency lower than frequency of the second carrier signal, the first and the second carrier signal to modulate or demodulate signals to be transmitted or received through the first and second frequency bands, respectively; and

a controller coupled to the RF filter block to control the RF filter block to select the first frequency band to transmit or receive a control signal to facilitate initial communication by the apparatus in the wireless network, enabling subsequent communication by the apparatus using the second frequency band.

20. The apparatus of claim 19, wherein said controller is further coupled to the one or more frequency synthesizers to control the one or more frequency synthesizers to select the first carrier signal to modulate or demodulate the control signal.

21. The apparatus of claim 20, wherein said controller is further adapted to control the one or more frequency synthesizers to select the second carrier signal to modulate or demodulate signals to be transmitted or received during said subsequent communications by the apparatus.

22. The apparatus of claim 19, wherein said one or more frequency synthesizers are further adapted to provide to the circuitry a third carrier signal, the third carrier signal to facilitate further modulation or demodulation of signals to be transmitted or received through the first and second frequency bands.

23. The apparatus of claim 22, wherein said circuitry further comprises a 90 degrees phase splitter coupled to the one or more frequency synthesizers to provide two carrier signals from the third carrier signal that are 90 degrees out-of-phase with each other, to further modulate or demodulate the signals to be transmitted or received through the first and second frequency bands.

24. The apparatus of claim 19, wherein said one or more frequency synthesizers to provide a first carrier signal to the circuitry that is an intermediate frequency (IF) carrier signal to modulate or demodulate signals transmitted or received through the second frequency band.

25. A system, comprising:

a radio frequency (RF) filter block to selectively transmit or receive signals in a wireless network using a selected one of a first frequency band or a second frequency band, the first frequency band being a lower frequency band than the second frequency band;

a controller coupled to the RF filter block to control the RF filter block to select the first frequency band to transmit or receive a control signal to facilitate initial communication by the system in the wireless network, enabling subsequent communication by the system using the second frequency band; and

an omnidirectional antenna coupled to the RF filter block to transmit or receive the signals using the first or second frequency bands.

26. The system of claim 25, wherein said controller is further adapted to control the RF filter block to select the second frequency band to transmit or receive a data signal in the wireless network, to facilitate said subsequent communication by the system using the second frequency band.

27. The system of claim 25, wherein said system further comprises another similarly constituted RF filter block coupled to the controller, with a first of the two RF filter blocks dedicated to said receiving of signals in the wireless network in said first or second frequency bands, and a second of the two RF filter blocks dedicated to said transmitting of signals in the wireless network in said first or second frequency bands, the controller respectively controlling the two RF filter blocks to select the first frequency band to transmit or receive a first control signal to facilitate initial communication by the system in the wireless network using the second frequency band, to select the second frequency band to transmit or receive a second control signal to further facilitate communication by the system using the second frequency band.