Multi-mode radio with interference cancellation circuit

• US 7,177,663 B2
• Filed: 05/24/2004
• Issued: 02/13/2007
• Est. Priority Date: 05/27/2003
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Axness, Timothy A., Kazakevich, Leonid
• Primary Examiner(s): Le, Lana
• Assistant Examiner(s): Perez, Angelica
• Application Number:
  US10/852,640
• Publication Number:
  US 20050020297A1
• Time in Patent Office: 995 Days
• Field of Search: 455/552.1, 455/73, 455/82, 455/87, 455/553.1, 455/570, 455/132
• US Class Current: 455/552.1
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

A multi-mode wireless transmit/receive unit (WTRU) includes at least one antenna, first and second communication mode receivers and a first communication mode transmitter. The first and second receivers simultaneously receive signals from the antenna. The first transmitter generates and sends a first type of signal to the antenna while, at the same time, the second receiver receives a second type of signal from the antenna. In a preferred embodiment, the WTRU further includes a vector multiplier configured to reduce or eliminate interference of signals received by the second receiver, the interference being caused by the first transmitter. The vector multiplier adjusts the phase and amplitude of noise (i.e., spurious in-band noise) measured by the second receiver. The WTRU may further include a second communication mode transmitter configured to generate and send a second type of signal to the antenna.

Claims

1. A multi-mode wireless transmit/receive unit (WTRU) comprising:

(a) at least one antenna configured to receive and transmit at least two different types of signals;

(b) a first communication mode receiver configured to receive a first type of signal from the antenna;

(c) a second communication mode receiver configured to receive a second type of signal from the antenna;

(d) a first communication mode transmitter configured to generate and send the first type of signal to the antenna, wherein the first and second communication mode receivers simultaneously receive signals from the antenna, and the first transmitter sends the first type of signal to the antenna while, at the same time, the second receiver receives the second type of signal from the antenna;

(e) a triplexer electrically coupled to the first communication mode receiver;

(f) a transmit/receive switch electrically coupled to the antenna and the triplexer;

(g) a first coupler electrically coupled to the triplexer and the first communication mode transmitter;

(h) a second coupler electrically coupled to the triplexer and the second communication mode receiver;

(i) a bandpass filter electrically coupled to the first coupler; and

(j) a vector multiplier electrically coupled to the bandpass filter and the second coupler, the vector multiplier configured to reduce or eliminate interference of signals received by the second communication mode receiver, the interference being caused by the first communication mode transmitter, wherein the vector multiplier adjusts the phase and amplitude of the interference.

2. The WTRU of claim 1 further comprising:

(k) a second communication mode transmitter electrically coupled to the transmit/receive switch, the second communication mode transmitter configured to generate and send the second type of signal to the antenna, wherein the transmit/receive switch is configured to selectively connect the second communication mode transmitter to the antenna, prevent signals from the antenna to reach the first and second communication mode receivers, and prevent the first communication mode transmitter from sending the first type of signal to the antenna.

3. The WTRU of claim 1 wherein the first communication mode receiver is a universal mobile telecommunications system (UMTS) receiver.

4. The WTRU of claim 1 wherein the second communication mode receiver is a global system for mobile communications (GSM) receiver.

5. The WTRU of claim 1 wherein the first type of signal is a frequency division duplex (FDD) signal.

6. The WTRU of claim 5 wherein the first type of signal received by the first communication mode receiver is originated by a universal terrestrial radio access (UTRA)-FDD cell.

7. The WTRU of claim 1 wherein the second type of signal is a time division multiple access (TDMA) signal.

8. The WTRU of claim 7 wherein the second type of signal received by the second communication mode receiver is originated by a universal terrestrial radio access (UTRA)-TDD cell.

9. The WTRU of claim 7 wherein the second type of signal received by the second communication mode receiver is originated by a global system for mobile communications (GSM) cell.

10. An integrated circuit (IC) used in combination with at least one antenna configured to receive and transmit at least two different types of signals, the IC comprising:

(a) a first communication mode receiver configured to receive a first type of signal from the antenna;

(b) a second communication mode receiver configured to receive a second type of signal from the antenna;

(c) a first communication mode transmitter configured to generate and send the first type of signal to the antenna, wherein the first and second communication mode receivers simultaneously receive signals from the antenna, and the first transmitter sends the first type of signal to the antenna while, at the same time, the second receiver receives the second type of signal from the antennas;

(d) a triplexer electrically coupled to the first communication mode receiver;

(e) a transmit/receive switch electrically coupled to the antenna and the triplexer;

(f) a first coupler electrically coupled to the triplexer and the first communication mode transmitter;

(g) a second coupler electrically coupled to the triplexer and the second communication mode receiver;

(h) a bandpass filter electrically coupled to the first coupler; and

(i) a vector multiplier electrically coupled to the bandpass filter and the second coupler, the vector multiplier configured to reduce or eliminate interference of signals received by the second communication mode receiver, the interference being caused by the first communication mode transmitter, wherein the vector multiplier adjusts the phase and amplitude of the interference.

11. The IC of claim 10 further comprising:

(j) a second communication mode transmitter electrically coupled to the transmit/receive switch, the second communication mode transmitter configured to generate and send the second type of signal to the antenna, wherein the transmit/receive switch is configured to selectively connect the second communication mode transmitter to the antenna, prevent signals from the antenna to reach the first and second communication mode receivers, and prevent the first communication mode transmitter from sending the first type of signal to the antenna.

12. The IC of claim 10 wherein the first communication mode receiver is a universal mobile telecommunications system (UMTS) receiver.

13. The IC of claim 10 wherein the second communication mode receiver is a global system for mobile communications (GSM) receiver.

14. The IC of claim 10 wherein the first type of signal is a frequency division duplex (FDD) signal.

15. The IC of claim 14 wherein the first type of signal received by the first communication mode receiver is originated by a universal terrestrial radio access (UTRA)-FDD cell.

16. The IC of claim 10 wherein the second type of signal is a time division multiple access (TDMA) signal.

17. The IC of claim 16 wherein the second type of signal received by the second communication mode receiver is originated by a universal terrestrial radio access (UTRA)-TDD cell.

18. The IC of claim 16 wherein the second type of signal received by the second communication mode receiver is originated by a global system for mobile communications (GSM) cell.

19. A multi-mode wireless transmit/receive unit (WTRU) comprising:

(a) at least one antenna configured to receive and transmit at least two different types of signals;

(b) a first communication mode receiver configured to receive a first type of signal from the antenna;

(c) a second communication mode receiver configured to receive a second type of signal from the antenna;

(d) a first communication mode transmitter configured to generate and send the first type of signal to the antenna, wherein the first and second communication mode receivers simultaneously receive signals from the antenna, and the first transmitter sends the first type of signal to the antenna while, at the same time, the second receiver receives the second type of signal from the antenna;

(e) a modem electrically coupled to the second communication mode receiver;

(f) an interference canceler control circuit electrically coupled to the modem; and

(g) a vector multiplier electrically coupled to the interference canceler control circuit, wherein the interference canceler control circuit receives measurements of noise measured by the second communication mode receiver via the modem, and adjusts the phase and amplitude of the vector multiplier to minimize the noise.

20. The WTRU of claim 19 further comprising:

(h) a triplexer electrically coupled to the first communication mode receiver;

(i) a transmit/receive switch electrically coupled to the antenna and the triplexer;

(j) a first coupler electrically coupled to the triplexer and the first communication mode transmitter;

(k) a second coupler electrically coupled to the vector multiplier, the triplexer and the second communication mode receiver; and

(l) a bandpass filter electrically coupled to the first coupler and the vector multiplier.