Digital, down-converted RF residual leakage signal mitigating RF residual leakage

• US 7,706,755 B2
• Filed: 11/09/2005
• Issued: 04/27/2010
• Est. Priority Date: 11/09/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Muhammad, Khurram, Leipold, Dirk
• Primary Examiner(s): Le; Lana N
• Application Number:
  US11/270,121
• Publication Number:
  US 20070105509A1
• Time in Patent Office: 1,630 Days
• Field of Search: 455 75- 83, 455/106, 455/109
• US Class Current: 455/76
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 1/707 using direct sequence modulation

Abstract

The present invention provides an RF transmission leakage mitigator for use with a full-duplex, wireless transceiver. In one embodiment, the RF transmission leakage mitigator includes an inversion generator configured to provide an RF transmission inversion signal of an interfering transceiver RF transmission to a receiving portion of the transceiver thereby creating a residual leakage signal. Additionally, the RF transmission leakage mitigator also includes a residual processor coupled to the inversion generator and configured to adjust the RF transmission inversion signal of the interfering transceiver RF transmission based on reducing the residual leakage signal to a specified level.

Claims

1. An RF transmission leakage mitigator in a transceiver having a transmitter and a receiver, comprising:

an inversion generator having a transmit signal input, an RF transmission inversion signal output to reduce interference from an RF transmission from the transmitter into the receiver of the transceiver, an amplitude adjustment signal input, and a phase adjustment signal input; and

a residual processor having an amplitude adjustment signal output connected to the amplitude adjustment signal input, a phase adjustment signal output connected to the phase adjustment signal input, and a digital, down-converted RF residual leakage signal input from the receiver.

2. The mitigator as recited in claim 1 in which the RF transmission inversion signal output is coupled to a receiving portion of a transceiver by a bond wire or a coupling strip.

3. The mitigator as recited in claim 1 in which the RF transmission inversion signal output is coupled to a receiving portion of a transceiver by an electrical coupling or a magnetic coupling.

4. The mitigator as recited in claim 1 in which the digital, down-converted RF residual leakage signal input is coupled to one of a main receive path employing a receive local oscillator;

and an auxiliary receive path employing a transmit local oscillator.

5. The mitigator as recited in claim 1 in which the residual processor includes a CORDIC engine and the residual processor uses at least one of a least mean square estimation and a CORDIC calculation to reduce a residual leakage signal on the digital, down-converted RF residual leakage signal input to a specified level.

6. The mitigator as recited in claim 5 wherein said specified level is a noise floor of a receiving portion of a transceiver.

7. A full-duplex CDMA transceiver, comprising:

a transmitter providing a transmission signals to an antenna;

a receiver having an input coupled to said antenna and providing digital, down-converted representations of signals received at the input; and

an RF transmission leakage mitigator, coupled to said transmitter and said receiver, including;

an inversion generator having a transmit signal input coupled to the transmission signals, an RF transmission inversion signal output coupled to the receiver input, an amplitude adjustment signal input, and a phase adjustment signal input, and

a residual processor having an amplitude adjustment signal output connected to the amplitude adjustment signal input, a phase adjustment signal output connected to the phase adjustment signal input, and an input coupled to the digital, down-converted representations of signals of the receiver.

8. The transceiver as recited in claim 7 wherein said RF transmission inversion signal output is coupled to the receiver input employing a bond wire or a coupling strip.

9. The transceiver as recited in claim 7 wherein said RF transmission inversion signal output is coupled to the receiver input employing an electrical coupling or a magnetic coupling.

10. The transceiver as recited in claim 7 wherein said down-converted representation is provided by one of:

a main receive path employing a receive local oscillator; and

an auxiliary receive path employing a transmit local oscillator.

11. The mitigator as recited in claim 7 in which the residual processor includes a CORDIC engine and the residual processor uses at least one of a least mean square estimation and a CORDIC calculation to reduce a residual leakage signal on the input coupled to the digital, down-converted representations of signals of the receiver to a specified level.

12. The mitigator as recited in claim 11 wherein said specified level is a noise floor of a receiving portion of a transceiver.