OPPORTUNISTIC ACTIVE INTERFERENCE CANCELLATION USING RX DIVERSITY ANTENNA

• US 20150200721A1
• Filed: 01/10/2014
• Published: 07/16/2015
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Hwang, Insoo, Song, Bongyong, Soliman, Samir Salib
• Granted Patent: US 9,306,654 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/02 Transmitters
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/126 having multiple inputs, e.g. auxiliary antenna for receiving interfering signal aerials in general H01Q
• CPC Class Codes: H04B 7/0814 based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
• CPC Class Codes: H04B 7/0877 switching off a diversity branch, e.g. to save power

Abstract

A method of performing interference cancellation (IC) in a wireless communication device having a receiver comprising at least a primary receiver chain and a diversity receiver chain includes determining an interference level of a transmitted signal on the receiver; determining whether the interference level is within a predetermined range; selecting a first mode of operation if the interference level is within a predetermined range; and selecting a second mode of operation if the interference level is not within the predetermined range. The first mode includes receiving, at the primary receiver chain, a first signal corresponding to the transmitted signal; receiving, at the diversity receiver chain, a second signal corresponding to the transmitted signal for providing to an IC circuit; generating, at the IC circuit, an output signal based on the second signal; and generating a cancellation signal based on the output signal and the first signal.

Claims

1. A method of performing interference cancellation (IC) in a wireless communication device having a receiver comprising at least a primary receiver chain and a diversity receiver chain, the method comprising:

determining an interference level of a transmitted signal on the receiver;

determining whether the interference level is within a predetermined range;

selecting a first mode of operation if the interference level is within a predetermined range; and

selecting a second mode of operation if the interference level is not within the predetermined range;

wherein the first mode comprises;

receiving, at the primary receiver chain, a first signal corresponding to the transmitted signal;

receiving, at the diversity receiver chain, a second signal corresponding to the transmitted signal for providing to an IC circuit;

generating, at the IC circuit, an output signal based on the second signal; and

generating a cancellation signal based on the output signal and the first signal;

wherein the second mode comprises;

receiving, at the primary receiver chain, a first signal corresponding to the transmitted signal;

processing, via the primary receiver chain, the first signal;

receiving, at the diversity receiver chain, a second signal corresponding to the transmitted signal; and

processing, via the diversity receiver chain, the second signal.

2. The method of claim 1, wherein a cancellation signal is not generated in the second mode.

3. The method of claim 1, wherein the transmitted signal is transmitted from a transmitter of a different wireless communication device.

4. The method of claim 1, wherein the transmitted signal is transmitted from a transmitter of the wireless communication device.

5. The method of claim 1, wherein the interference level comprises at least one of a signal-to-interference (SIR) level and an interference-to-noise (INR) level.

6. The method of claim 1, the method further comprising:

detecting a co-existence issue between a transmitter transmitting the transmitted signal and the receiver

7. The method of claim 6,

wherein a first co-existence issue corresponds to a first predetermined range;

and

wherein a second co-existence issue corresponds to a second predetermined range.

8. The method of claim 6, wherein the predetermined range is based on the co-existence issue.

9. The method of claim 6, wherein the detecting a co-existence issue comprises comparing the interference level with a pre-defined table.

10. The method of claim 6, wherein the method is not performed if the co-existence issue is not detected.

11. The method of claim 1, wherein the IC circuit comprises an adaptive filter.

12. The method of claim 11, wherein the adaptive filter comprises a least mean squares (LMS) adaptive filter.

13. The method of claim 12, wherein the LMS adaptive filter comprises at least one of an analog-controlled analog LMS adaptive filter and a digitally-controlled analog LMS adaptive filter.

14. The method of claim 1, wherein the primary receiver chain comprises a primary filter and the diversity receiver chain comprises a diversity filter.

15. The method of claim 14, wherein the primary filter and the diversity filter have identical filtering characteristics.

16. The method of claim 14, wherein each of the primary filter and the diversity filter comprises at least one of a band pass filter, a duplexer, and a notch filter.

17. An apparatus for performing interference cancellation (IC) in a wireless communication device having a receiver comprising at least a primary receiver chain and a diversity receiver chain, the apparatus comprising:

a processor configured to determine an interference level of a transmitted signal on the receiver, the processor configured to determine whether the interference level is within a predetermined range, the processor configured to select a first mode of operation if the interference level is within a predetermined range, and the processor configured to select a second mode of operation if the interference level is not within the predetermined range; and

an IC circuit, wherein in the first mode of the operation,

the IC circuit is configured to generate an output signal based on a second signal received at the diversity receiver chain, the second signal corresponding to the transmitted signal; and

the IC is configured to generate a cancellation signal based on the output signal and a first signal received at the primary receiver chain, the first signal corresponding to the transmitted signal.

18. A method of performing interference cancellation (IC) in a wireless communication device having a receiver comprising at least a primary receiver chain and a diversity receiver chain, the method comprising:

determining an interference level of a transmitted signal on the receiver;

determining whether the interference level is within a predetermined range;

selecting one of the primary receiver chain and the diversity receiver chain based on the interference level of each;

selecting a first mode of operation if the interference level is within a predetermined range; and

selecting a second mode of operation if the interference level is not within the predetermined range;

wherein the first mode comprises;

receiving, at the selected receiver chain, a first signal corresponding to the transmitted signal;

receiving, at the other receiver chain, a second signal corresponding to the transmitted signal for providing to an IC circuit;

generating, at the IC circuit, an output signal based on the second signal; and

generating a cancellation signal based on the output signal and the first signal;

wherein the second mode comprises;

receiving, at the selected receiver chain, a first signal corresponding to the transmitted signal;

processing, via the selected receiver chain, the first signal;

receiving, at the other receiver chain, a second signal corresponding to the transmitted signal; and

processing, via the other receiver chain, the second signal.

19. The method of claim 18, wherein the primary receiver chain is selected if the interference level on the primary receiver chain is greater than the interference level on the diversity receiver chain.

20. The method of claim 18, wherein the diversity receiver chain is selected if the interference level on the diversity receiver chain is greater than the interference level on the primary receiver chain.