Supporting multiple wireless protocols in a wireless device

• US 20040120421A1
• Filed: 12/18/2002
• Published: 06/24/2004
• Est. Priority Date: 12/18/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Filipovic, Daniel F.
• Granted Patent: US 7,106,816 B2
• Time in Patent Office: Days
• US Class Current: 375/316
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

This disclosure is directed toward a wireless device configured to support a plurality of wireless protocols. More specifically, the wireless device includes signal processing components that can be used in more than one communication mode. Accordingly, distinct components conventionally used in a wireless device that supports a plurality of protocols may be eliminated in favor of one or more common components that can be used in the different communication modes. In one example, an analog filter is used to filter baseband signals associated with a first protocol and a second protocol. A digital filter can then be used to perform additional filtering on digital baseband signals associated with the second protocol. By using a common analog filter for analog filtering of baseband signals associated with different protocols, the architecture and design of a wireless device can be simplified.

Claims

1. A method comprising:

filtering a first analog signal with an analog filter, the first analog signal being modulated according to a first wireless protocol;

converting the first analog signal to a first digital signal;

demodulating the first digital signal;

filtering a second analog signal with the analog filter, the second analog signal being modulated according to a second wireless protocol;

converting the second analog signal to second digital signal;

filtering the second digital signal with a digital filter; and

demodulating the second digital signal.

2. The method of claim 1, further comprising:

receiving user input selecting the first wireless protocol and disabling the digital filter when the first protocol is selected; and

receiving user input selecting the second wireless protocol and enabling the digital filter when the second protocol is selected.

3. The method of claim 1, wherein the analog filter filters the first analog signal to condition the first analog signal for subsequent demodulation of the first digital signal according to the first wireless protocol, wherein the analog filter filters the second analog signal to partially condition the second analog signal, and wherein the digital filter filters the second digital signal to condition the second digital signal for demodulation according to the second wireless protocol.

4. The method of claim 1, wherein the first wireless protocol is selected from the group consisting of:

an IEEE 802.11a protocol and an IEEE 802.11g protocol; and

wherein the second wireless protocol comprises an IEEE 802.11b protocol.

5. A method comprising:

filtering signals modulated according to different wireless protocols using a common analog filter; and

selectively filtering some of the signals using a digital filter based on wireless protocols associated with the respective signals.

6. The method of claim 5, wherein filtering signals modulated according to different wireless protocols using the common analog filter includes filtering a first analog baseband signal and a second analog baseband signal using the common analog filter, the first analog baseband signal being modulated according to a wireless protocol that is different than that of the second analog baseband signal, and wherein selectively filtering some of the signals includes filtering a first digital baseband signal generated from the first analog baseband signal using the digital filter and not filtering a second digital baseband signal generated from the second analog baseband signal using the digital filter.

7. A method of supporting multiple protocols in a wireless device comprising:

receiving first and second wireless signals at a first receiver, the first and second wireless signals being modulated and transmitted according to first and second wireless protocols respectively;

receiving a third wireless signal at a second receiver, the third wireless signal being modulated and transmitted according to a third wireless protocol;

converting the first, second, and third wireless signals to first, second, and third baseband signals respectively;

filtering the first, second, and third baseband signals using a common analog filter;

converting the first, second, and third baseband signals to first, second, and third digital baseband signals respectively;

filtering the second digital baseband signal using a digital filter;

not filtering the first and third digital baseband signals using the digital filter; and

demodulating the first, second, and third digital baseband signals.

8. The method of claim 7, further comprising:

configuring the wireless device for the first wireless protocol by enabling the first receiver, disabling the second receiver, and disabling the digital filter;

configuring the wireless device for the second wireless protocol by enabling the first receiver, disabling the second receiver, and enabling the digital filter; and

configuring the wireless device for the third wireless protocol by enabling the second receiver, disabling the first receiver, and disabling the digital filter.

9. The method of claim 7, wherein the first wireless protocol comprises an IEEE 802.11a protocol, the second wireless protocol comprises an IEEE 802.11b protocol, and the third protocol comprises an IEEE 802.11g protocol.

10. An apparatus comprising:

an analog filter to filter signals associated with a plurality of wireless protocols; and

a digital filter to selectively filter some of the signals based on a respective wireless protocol associated with a signal.

11. The apparatus of claim 10, further comprising a control unit to enable or disable the digital filter based on the respective wireless protocol.

12. The apparatus of claim 10, wherein the control unit receives user input specifying one wireless protocol, and enables the digital filter in response to the user input.

13. The apparatus of claim 10, wherein the control unit receives user input specifying one wireless protocol, and disables the digital filter in response to the user input.

14. The apparatus of claim 10, wherein the analog filter is a transconductance-capacitor (gmC) filter, and wherein the digital filter is clocked at a rate corresponding to a size of a desired pass band for one of the plurality of wireless protocols.

15. A wireless device comprising:

one or more receivers to receive different wireless signals modulated according to a plurality of different wireless protocols;

an analog filter to filter analog signals associated with the different wireless signals;

an analog-to-digital converter to convert the analog signals to digital signals;

a digital filter to selectively filter some of the digital signals generated from the analog signals based on the wireless protocols associated with respective signals; and

one or more demodulators to demodulate the digital signals.

16. The wireless device of claim 15, further comprising a control unit to configure the wireless device to selectively filter digital signals.

17. The wireless device of claim 16, wherein the control unit enables or disables the digital filter based on a selected wireless protocol.

18. The wireless device of claim 17, wherein the control unit receives user input specifying the selected wireless protocol, and enables the digital filter in response to the user input.

19. The wireless device of claim 17, wherein the control unit receives user input specifying the selected wireless protocol, and disables the digital filter in response to the user input.

20. The wireless device of claim 15, wherein the analog filter is a transconductance-capacitor (gmC) filter, and wherein the digital filter is clocked at a rate corresponding to a size of a desired pass band for one of the plurality of wireless protocols.

21. A wireless device comprising:

a first receiver to receive first and second wireless signals and to convert the first and second wireless signals to first and second analog baseband signals respectively, the first and second analog baseband signals being modulated according to first and second wireless protocols respectively;

a second receiver to receive a third wireless signal and to convert the third wireless signal to a third analog baseband signal, the third analog baseband signal being modulated according to a third wireless protocol;

an analog filter to filter the first, second, and third analog baseband signals;

an analog-to-digital converter to convert the first, second, and third analog baseband signals to first, second, and third digital baseband signals respectively;

a digital filter to selectively filter the second digital baseband signal but not filter the first and third digital baseband signals; and

one or more demodulators to demodulate the first, second, and third digital baseband signals.

22. The wireless device of claim 21, further comprising a control unit to:

configure the wireless device for the first wireless protocol by enabling the first receiver, disabling the second receiver, and disabling the digital filter;

configure the wireless device for the second wireless protocol by enabling the first receiver, disabling the second receiver, and enabling the digital filter; and

configure the wireless device for the third wireless protocol by enabling the second receiver, disabling the first receiver, and disabling the digital filter.

23. The wireless device of claim 22, wherein the control unit receives user input specifying one wireless protocol, and configures the wireless device consistent with the one wireless protocol.

24. A computer readable medium comprising machine readable instructions that when executed in a wireless device that includes a common analog filter to filter analog signals and a digital filter to filter digital signals associated with some analog signals:

disables the digital filter for a first wireless protocol; and

enables the digital filter for a second wireless protocol.

25. The computer readable medium of claim 24, wherein the instructions when executed receive user input specifying a user selected wireless protocol, disable the digital filter if the user selected wireless protocol corresponds to the first wireless protocol and enable the digital filter if the user selected wireless protocol corresponds to the second wireless protocol.

26. The computer readable medium of claim 24, wherein the medium comprises memory that stores the machine readable instructions for execution by a control unit of the wireless device.

27. An apparatus comprising:

means for filtering analog signals associated with a plurality of wireless protocols; and

means for selectively filtering digital signals generated from the analog signals based on the wireless protocol associated with respective signals.

28. The apparatus of claim 27, further comprising:

means for receiving wireless signals; and

means for converting the wireless signals to baseband signals, the baseband signals being the analog signals, and the digital signals being digital representations of the baseband signals.

29. The apparatus of claim 27, further comprising means for demodulating the digital signals.

30. A method comprising:

receiving first and second wireless signals respectively conforming first and second wireless protocols;

mixing the first and second wireless signals to first and second analog baseband signals;

filtering the first and second analog baseband signals with an analog filter;

converting the first and second analog baseband signals to first and second digital baseband signals;

demodulating the first digital baseband signal;

filtering the second digital baseband signal using a digital filter; and

demodulating the second digital baseband signal.

31. The method of claim 30, further comprising:

receiving user input selecting the first wireless protocol and disabling the digital filter when the first protocol is selected; and

receiving user input selecting the first wireless protocol and enabling the digital filter with the second protocol is selected.