Device and method for processing a signal received by a receiver disrupted by a transmitter

• US 10,056,927 B2
• Filed: 06/06/2017
• Issued: 08/21/2018
• Est. Priority Date: 06/06/2016
• Status: Active Grant

• Current Assignee: Airbus DS SLC
• Original Assignee: Airbus DS SLC
• Inventors: Gagey, Olivier, Mege, Philippe, Molko, Christophe, Perrin, Olivier
• Primary Examiner(s): Perez, James M
• Application Number:
  US15/614,955
• Publication Number:
  US 20170353202A1
• Time in Patent Office: 441 Days
• Field of Search: 375219-236, 375259-285, 375316-352
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

A device for processing a received signal by a receiver disrupted by a transmitter, wherein the transmitters and receiver are co-located, includes: a first coupler configured to take a first reference signal; an analog circuit for processing the first reference signal; a second coupler configured to combine the modified reference signal with the signal received by an antenna of the receiver; a first analog-to-digital conversion module digitizing the first reference signal; the second analog conversion module digitizing the combined signal in order to deliver a digital combined signal to the digital signal-processing device, wherein signal-processing device delivers a resulting digital signal to a data-processing module of the receiver device.

Claims

1. A device for processing a signal received by a receiver disrupted by a transmitter, wherein said transmitter and receiver are co-located, wherein said device comprises:

a first coupler configured to take a first reference signal from an interfering signal transmitted by the transmitter, wherein the first reference signal is taken after an amplification chain connected to a transmitter'"'"'s antenna;

an analogue circuit to process the first reference signal delivering a modified reference signal, wherein the analogue processing circuit modifies at least one of the parameters, including;

the amplitude and/or phase and/or time lag of the first reference signal, wherein the modified reference signal is able to compensate for the interfering signal transmitted by the transmitter present in the signal received by the receiver;

a second coupler configured to combine the modified reference signal with the signal received by an antenna of the receiver, delivering the combined signal to a second analogue-to-digital conversion module;

a first analogue-to-digital conversion module digitising the first reference signal in order to deliver to a signal-processing digital device a first digital reference signal, said signal-processing digital device being comprised in the device for processing a signal received; and

the second analogue-to-digital conversion module digitising the combined signal in order to deliver a digital combined signal to the digital signal-processing device, wherein the signal-processing device combines the digital combined signal and at least the first digital reference signal in order to reduce the intensity of the interfering signal present in the digital combined signal, wherein said signal-processing device delivers a resulting digital signal to a data-processing module of the receiver device.

2. The device according to claim 1, further comprising a third analogue-to-digital conversion module configured to digitise the modified reference signal in order to deliver a digital modified reference signal to the digital signal-processing device, wherein said modified reference signal is taken after the analogue processing circuit, wherein the signal-processing device combines the digital combined signal and two digital reference signals, the first digital reference signal and the digital modified reference signal, in order to reduce the intensity of the interfering signal present in the digital combined signal, wherein said signal-processing device delivers a resulting digital signal to a data-processing module of the receiver device.

3. The device according to claim 1, wherein the receiver is a receiver of the narrow-band type the bandwidth of which is less than 10 MHz.

4. The device according to claim 1, wherein at least one analogue-to-digital conversion module includes at least one of the following elements:

a local oscillator, a mixer to split the incoming signal into basebands, a low-pass filter to eliminate the image frequency, and an analogue-to-digital converter to provide the digital version of the baseband components of the incoming signal.

5. The device according to claim 1, wherein the analogue processing circuit includes at least one variable phase splitter and a variable gain to generate the modified reference signal.

6. The device according to claim 5, wherein the analogue processing circuit also contains a fixed delay circuit and/or a configurable delay circuit to generate the modified reference signal.

7. The device according to claim 1, wherein the digital signal-processing device includes at least one processor or other computation device.

15. A system for transmission/reception of a radio signal including at least one transmission antenna connected to a transmitter device and a reception antenna connected to a receiver device, wherein said transmission/reception device includes the device for reducing the intensity of an interfering signal according to claim 1.

16. A device for transmission/reception of a radio signal including an antenna connected both to a transmitter device and to a receiver device, wherein said device includes a device for reducing the intensity of an interfering signal according to claim 1.

8. A method for implementation of a device for processing a signal received by a receiver disrupted by a transmitter, wherein said transmitter and receiver are co-located, the method comprising:

taking, by a first coupler, a first reference signal from an interfering signal transmitted by the transmitter, wherein said first reference signal is taken after an amplification chain connected to the transmitter'"'"'s antenna;

modifying the properties of the first reference signal using an analogue processing circuit, to obtain a modified reference signal, wherein at least one of the modified properties includes the amplitude, phase, and/or time lag of the first reference signal, wherein said modified reference signal is able to compensate for the interfering signal transmitted by the transmitter which is present in the signal received by the receiver;

combining, by a second coupler, the modified reference signal and the signal received by an antenna of the receiver to obtain a combined signal;

analogue-to-digital converting the combined signal to obtain a digital combined signal;

analogue-to-digital converting the first reference signal to obtain a first digital reference signal

combining using a signal-processing device, the digital combined signal and at least the first digital reference signal in order to eliminate the interfering signal present in the digital combined signal; and

transmitting the digital resulting signal to a data-processing module of the receiver.

9. The method according to claim 8, further comprising analogue-to-digital converting the modified reference signal to obtain a digital modified reference signal, wherein said modified reference signal is taken after the analogue processing circuit, wherein the digital combination, using the signal-processing device, of the digital combined signal, of the first digital reference signal and of the modified reference signal is accomplished in order to eliminate the interfering signal present in the digital combined signal.

10. The method according to claim 8, wherein the combining using the signal-processing device of the digital combined signal and of the first digital reference signal in order to eliminate the interfering signal present in the digital combined signal includes the iterative minimisation of the difference between the digital combined signal and the first digital reference signal in order to send the digital resulting signal to a data-processing module of the receiver device, wherein the difference to be minimised takes the form R2n−

Ref1n^T·

ā

, where each term of vector Ref1n represents the first digital reference signal with a given digital time lag, and where the terms of vector ā

act as adjustment parameters.

11. The method according to claim 9, wherein the combining using the signal-processing device of the digital combined signal, of the first digital reference signal and of the digital modified reference signal in order to eliminate the interfering signal present in the digital combined signal includes the iterative minimisation of the difference between the digital sum signal, the first digital reference signal and the digital modified reference signal in order to send the digital resulting signal to a data-processing module of the receiver device, wherein the difference to be minimised takes the form R2n″

=R2n−

Ref1n^T·

a1−

Ref2n^T, a2, wherein each term of vector Ref1n represents the first digital reference signal with a given digital time lag, where the terms of vector a₁ act as adjustment parameters, wherein each term of vector Ref2_n represents the digital modified reference signal with a given digital time lag, and where the terms of vector act a₂ adjustment parameters.

12. The method according to claim 10, wherein the iterative minimisation of the difference between the digital combined signal and at least one digital reference signal is accomplished using an algorithm of the stochastic gradient type.

13. The method according to claim 8, wherein the steps of analogue-to-digital conversion provide a digital representation of the baseband signals.

14. The method according to claim 8, further comprising digital filtering, applied before the digital signal-processing device, of the first digital reference signal, of the digital modified reference signal, and of the digital combined signal, in order to select the frequency range corresponding to the receiver band of the receiver.