IP Library › Granted Patent US 7,376,093
Granted Patent B2
US 7,376,093 · App. 10/192,363 · Granted May 20, 2008

Filtering method to allow FDD and TDD operations in PCS transreceivers

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Quick Facts
Patent No.
US 7,376,093
App. No.
10/192,363
Granted
May 20, 2008
Kind
B2
Abstract

A transreceiver allows efficient operation in a full or half-duplex TDD or FDD system. The preferred transreceiver includes a common set of filters used for both FDD (Frequency Division Duplex) and TDD (Time Division Duplex) operation in a given range of frequencies thereby reducing circuitry count and implementation costs. Thus, the transreceiver of the present invention can operate in FDD operation or TDD operation.

Claims (33)

1. An apparatus, comprising:

a first filter tuned to a first PCS band;

a second filter tuned to a second PCS band; and

a mode select switch to couple between said first filter and said second filter, the apparatus to operate in a first mode when said mode select switch is open, and the apparatus to operate in a second mode when said mode select switch is closed, the second mode being a TDD mode.

2. An apparatus as claimed in claim 1 , the first and second filters to couple to an antenna.

3. An apparatus as claimed in claim 1 , one of the first mode and the second mode being a half-duplex mode, and another of the first mode and the second mode being a full-duplex mode.

4. An apparatus as claimed in claim 1 , the first mode being an FDD mode.

5. An apparatus as claimed in claim 1 , further comprising a transmit switch to couple to said first filter, and a receive switch to couple to said second filter, said transmit switch and said receive switch to select between a transmit and a receive operation.

6. An apparatus, comprising:

a first filter tuned to a first PCS frequency band;

a second filter tuned to a second PCS frequency band;

a third filter tuned to a third frequency band;

a first mode select switch disposed between said first filter and said third filter; and

a second mode select switch disposed between said second filter and said third filter, the apparatus to operate in a first mode when said first mode switch and said second mode switch are open, and the apparatus to operate in a second mode when at least one of said first mode switch and said second mode switch is closed.

7. An apparatus as claimed in claim 6 , said first filter, said second filter, and said third filter to couple to an antenna.

8. An apparatus as claimed in claim 6 , said first filter, said second filter, and said third filter to couple directly to an antenna.

9. An apparatus as claimed in claim 6 , one of the first mode and the second mode being a half-duplex mode, and another of the first mode and the second mode being a full-duplex mode.

10. An apparatus as claimed in claim 6 , the first mode being an FDD mode.

11. An apparatus as claimed in claim 6 , the second mode being a TDD mode.

12. An apparatus as claimed in claim 6 , the first mode being an FDD mode, and the second mode being a TDD mode.

13. An apparatus as claimed in claim 6 , further comprising a transmit switch to couple to said first filter, and a receive switch to couple to said second filter, said first and second switches to select between a transmit and a receive operation.

14. An apparatus as claimed in claim 6 , the third frequency band being an unlicensed frequency band.

15. An apparatus as claimed in claim 6 , the third frequency band being in betweenthe first PCS frequency band and the second PCS frequency band.

16. A method, comprising:

operating an apparatus in a first mode when a first filter tuned to a first frequency band is uncoupled from a second filter tuned to a second frequency band; and

operating the apparatus in a second mode when the first filter and the second filter are coupled, wherein one of the first mode and the second mode is a half-duplex mode, and another of the first mode and the second mode is a full duplex mode.

17. A method as claimed in claim 16 , the first mode being an FDD mode.

18. A method as claimed in claim 16 , the second mode being a TDD mode.

19. A method as claimed in claim 16 , the first mode being an FDD mode, and the second mode being a TDD mode.

20. A method as claimed in claim 16 , further comprising coupling a third filter tuned to a third frequency band to at least one of the first filter and the second filter when operating the apparatus in the second mode.

21. A method as claimed in claim 16 , further comprising coupling a third filter tuned to a third frequency band to both the first filter and the second filter when operating the apparatus in the second mode.

22. An apparatus as claimed in claim 1 , the first and second filters to couple directly to an antenna.

23. The method as claimed in claim 16 , the first frequency band being a first PCS frequency band, and the second frequency band being a second PCS frequency band.