Self-interference channel estimation method and device

• US 10,153,921 B2
• Filed: 01/30/2017
• Issued: 12/11/2018
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhou, Juan, Zhao, Ran, Lin, Huajiong
• Primary Examiner(s): Weidner, Timothy J
• Application Number:
  US15/419,393
• Publication Number:
  US 20170141937A1
• Time in Patent Office: 680 Days
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

A self-interference channel estimation method and device, where the method includes: determining, when a receive port of the first device receives a first signal, a second signal transmitted by a transmit port of the first device, wherein the first signal comprises a service signal from a second device, and comprises a self-interference signal originated from the second signal interfering, through an air interface, with the service signal from the second device, wherein service data comprised in the second signal is segmented into at least two segments, and a signal sequence formed by at least one preset character is inserted between the at least two segments of service data; estimating, according to the first signal and the second signal, the self-interference signal originated from the second signal; and eliminating the estimated self-interference signal from the received first signal.

Claims

1. A self-interference channel estimation method, comprising:

determining, by a first device when a receive port of the first device receives a first signal, a second signal transmitted by a transmit port of the first device, wherein the first signal comprises a service signal from a second device, and comprises a self-interference signal originated from the second signal which interfering, through an air interface, with the service signal from the second device, wherein service data comprised in the second signal is segmented into at least two segments, and a signal sequence formed by at least one preset character is inserted between the at least two segments of service data;

estimating, by the first device according to the first signal and the second signal, the self-interference signal originated from the second signal, wherein the estimating the self-interference signal originated from the second signal comprises;

estimating, by using the first signal and the second signal, a channel value of a channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device; and

estimating, according to the channel value and the second signal, the self-interference signal of interference that the second signal transmitted by the transmit port of the first device causes, through the air interface, to the service signal received by the receive port of the first device; and

eliminating, by the first device, the estimated self-interference signal from the received first signal, wherein the estimating, by using the first signal and the second signal, a channel value of a channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device comprises;

performing fast Fourier transform (FFT) on the determined second signal to obtain a first frequency domain value;

performing time domain accumulation and frequency domain accumulation on a modular square of the first frequency domain value, and performing normalization processing on an accumulation result to obtain a first normalization result;

performing radio frequency processing and analog-to-digital conversion (ADC) on the received first signal to obtain a digital signal;

performing FFT on the digital signal to obtain a second frequency domain value;

multiplying a conjugate of the first frequency domain value by the second frequency domain value, performing time domain accumulation and frequency domain accumulation on an obtained product, and performing normalization processing on an accumulation result to obtain a second normalization result; and

estimating, according to the first normalization result and the second normalization result, the channel value of the channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device.

2. The method according to claim 1, wherein the estimating, according to the first normalization result and the second normalization result, the channel value of the channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device comprises:

dividing the second normalization result by the first normalization result, and considering an obtained quotient value as the estimated channel value of the channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device.

3. The method according to claim 1, wherein the estimating, according to the channel value and the second signal, the self-interference signal of interference that the second signal transmitted by the transmit port of the first device causes, through the air interface, to the service signal received by the receive port of the first device comprises:

multiplying the channel value by the first frequency domain value, performing inverse fast Fourier transform (IFFT) on an obtained product, and considering a transform result as the self-interference signal of interference that the second signal transmitted by the transmit port of the first device causes, through the air interface, to the service signal received by the receive port of the first device.

4. The method according to claim 1, wherein if the determined second signal is an analog signal, wherein the analog signal is obtained by performing digital-to-analog conversion (DAC) and radio frequency processing on a signal sequence that is formed by at least one preset character and inserted between at least two segments of service data that are obtained by segmenting comprised service data, the performing FFT on the determined second signal to obtain a first frequency domain value comprises:

performing radio frequency processing and analog-to-digital conversion (ADC) on the determined analog signal to obtain a digital signal corresponding to the analog signal, and performing FFT on the digital signal corresponding to the analog signal to obtain the first frequency domain value.

5. The method according to claim 1, wherein the signal sequence formed by at least one preset character is a signal sequence formed by all zeros.

6. A self-interference channel estimation device, comprising:

a receiver, configured to receive a first signal on a receive port of the first device, wherein the first signal comprises a service signal from a second device, and comprises a self-interference signal originated from a second signal transmitted by a transmit port of the first device, and the self-interference signal interferes with the service signal from the second device;

a processor, configured to;

determine the second signal transmitted by the transmit port of the first device when the receiver receives the first signal, wherein service data comprised by the second signal is segmented into at least two segments, and a signal sequence formed by at least one preset character is inserted between the at least two segments of service data;

estimate, according to the first signal and the second signal, the self-interference signal originated from the second signal;

eliminate the estimated self-interference signal from the received first signal;

estimate, by using the first signal and the second signal, a channel value of a channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device;

estimate, according to the channel value and the second signal, the self-interference signal of interference that the second signal transmitted by the transmit port of the first device causes, through the air interface, to the service signal received by the receive port of the first device;

perform fast Fourier transform (FFT) on the determined second signal to obtain a first frequency domain value, perform time domain accumulation and frequency domain accumulation on a modular square of the first frequency domain value, and perform normalization processing on an accumulation result to obtain a first normalization result;

perform radio frequency processing and analog-to-digital conversion (ADC) on the received first signal to obtain a digital signal, and perform FFT on the digital signal to obtain a second frequency domain value;

multiply a conjugate of the first frequency domain value by the second frequency domain value, perform time domain accumulation and frequency domain accumulation on an obtained product, and perform normalization processing on an accumulation result to obtain a second normalization result; and

estimate, according to the first normalization result and the second normalization result, the channel value of the channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device.

7. The estimation device according to claim 6, wherein the processor is further configured to:

divide the second normalization result by the first normalization result, and consider an obtained quotient value as the estimated channel value of the channel over which the second signal transmitted by the transmit port of the first device causes, through the air interface, interference to the service signal received by the receive port of the first device.

8. The estimation device according to claim 6, wherein the processor is further configured to:

multiply the channel value by the first frequency domain value, perform inverse fast Fourier transform (IFFT) on an obtained product, and consider a transform result as the estimated self-interference signal of interference that the second signal transmitted by the transmit port of the first device causes, through the air interface, to the service signal received by the receive port of the first device.

9. The estimation device according to claim 6, wherein:

the processor is further configured to perform radio frequency processing and analog-to-digital conversion (ADC) on an analog signal, in a case that the determined analog signal is the analog signal, to obtain a digital signal corresponding to the analog signal, and perform FFT on the digital signal corresponding to the analog signal to obtain the first frequency domain value.

10. The estimation device according to claim 6, wherein the signal sequence formed by at least one preset character is a signal sequence formed by all zeros.