Increasing Wireless Spectral Efficiency by Leveraging Interfering Signals

• US 20190319654A1
• Filed: 06/27/2019
• Published: 10/17/2019
• Est. Priority Date: 06/30/2017
• Status: Active Grant

• Current Assignee: T-Mobile USA, Inc. (Deutsche Telekom AG)
• Original Assignee: T-Mobile USA, Inc. (Deutsche Telekom AG)
• Inventors: Zhang, Hongliang, Ahmet, Jeff, Arcot Kumar, Dinesh, Gronstad, Egil, Olsen, Brian Allan, McDiarmid, Mark
• Granted Patent: US 10,498,377 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 17/12 Simultaneous equations , e.g. systems of linear equations
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 2001/1045 Adjacent-channel interference
• CPC Class Codes: H04B 2001/1072 by tuning the receiver frequency
• CPC Class Codes: H04L 25/03038 with a non-recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03331 Arrangements for the joint estimation of multiple sequences
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A computing system may utilize interfering signals of two or more wireless devices for improving communications involving the two or more wireless devices. These techniques and architectures may allow for improved spectral efficiency that enables a relatively large number of wireless devices to communicate among one another via receivers that share overlapping or adjacent frequencies. Such utilization of interfering signals may help solve a general problem involving, for example, co-channel interference (CCI) arising from densely deployed relatively small wireless communication cells for increasing communication throughput.

Claims

1. A computer-implemented method comprising:

receiving, by a server, a first signal from a first receiver, wherein the first signal includes at least a first principle component generated by a first wireless device and a first interfering component generated by a second wireless device;

receiving, by the server, a second signal from a second receiver, wherein the second signal includes at least a second principle component generated by the second wireless device and a second interfering component generated by the first wireless device;

decoupling, by the server, the first principle component generated by the first wireless device from the first interfering component generated by the second wireless device and the second principle component generated by the second wireless device from the second interfering component generated by the first wireless device by simultaneously solving a first linear equation associated with the first signal and a second linear equation associated with the second signal; and

determining, by the server, a first modulation symbol transmitted by the first wireless device based on the first principle component and a second modulation symbol transmitted by the second wireless device based on the second principle component.

2. The computer-implemented method of claim 1, further comprising de-mapping, by the server, the first modulation symbol into a first coded bit sequence associated with the first wireless device and the second modulation symbol into a second coded bit sequence associated with the second wireless device.

3. The computer-implemented method of claim 2, further comprising removing, by the server, residual errors by using forward error correction on the first coded bit sequence and the second coded bit sequence.

4. The computer-implemented method of claim 1, further comprising:

determining, by the server, channel gains of at least the first principle component and the second principle component,

wherein the determining the first modulation symbol and the second modulation symbol is further based in part on the channel gains.

5. The computer-implemented method of claim 4, wherein the server determines the channel gains at least in part using reference signals transmitted by the first wireless device and the second wireless device.

6. The computer-implemented method of claim 1, wherein the first modulation symbol and the second modulation symbol are quadrature amplitude modulation symbols.

7. The computer-implemented method of claim 1, wherein:

a result of the decoupling based on simultaneously solving the first linear equation and the second linear equation includes an estimated first modulation symbol and an estimated second modulation symbol, and

determining the first modulation symbol and the second modulation symbol comprises de-mapping the estimated first modulation symbol into the first modulation symbol and de-mapping the estimated second modulation symbol into the second modulation symbol.

8. The computer-implemented method of claim 1, further comprising:

determining, by the server, a first signal to interference plus noise power ratio (SINR) for the first signal and a second SINR for the second signal;

determining, by the server, that the second SINR is larger than the first SINR; and

determining, by the server in response to determining that the second SINR is larger than the first SINR, that the second principal component is stronger relative to the second interfering component than the first principal component is relative to the first interfering component.

9. The computer-implemented method of claim 8, further comprising offsetting, by the server, the first interfering component of the first signal using the second principle component of the second signal.

10. The computer-implemented method of claim 1, further comprising:

normalizing, by the server, the first signal using a first channel gain of the first principle component; and

normalizing, by the server, the second signal using a second channel gain of the second principle component.

11. A server comprising:

one or more processors;

memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising;

receiving a first signal from a first receiver, wherein the first signal includes at least a first principle component generated by a first wireless device and a first interfering component generated by a second wireless device;

receiving a second signal from a second receiver, wherein the second signal includes at least a second principle component generated by the second wireless device and a second interfering component generated by the first wireless device;

decoupling the first principle component generated by the first wireless device from the first interfering component generated by the second wireless device and the second principle component generated by the second wireless device from the second interfering component generated by the first wireless device by simultaneously solving a first linear equation associated with the first signal and a second linear equation associated with the second signal; and

determining a first modulation symbol transmitted by the first wireless device based on the first principle component and a second modulation symbol transmitted by the second wireless device based on the second principle component.

12. The server of claim 11, wherein the operations further comprise de-mapping the first modulation symbol into a first coded bit sequence associated with the first wireless device and the second modulation symbol into a second coded bit sequence associated with the second wireless device.

13. The server of claim 12, wherein the operations further comprise removing residual errors by using forward error correction on the first coded bit sequence and the second coded bit sequence.

14. The server of claim 11, wherein:

the operations further comprise determining channel gains of at least the first principle component and the second principle component, and

wherein the determining the first modulation symbol and the second modulation symbol is further based in part on the channel gains.

15. The server of claim 11, wherein the operations further comprise:

determining a first signal to interference plus noise power ratio (SINR) for the first signal and a second SINR for the second signal;

determining that the second SINR is larger than the first SINR;

determining, in response to determining that the second SINR is larger than the first SINR, that the second principal component is stronger relative to the second interfering component than the first principal component is relative to the first interfering component; and

offsetting the first interfering component of the first signal using the second principle component of the second signal.

16. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors of a server, cause the server to perform operations comprising:

receiving a first signal from a first receiver, wherein the first signal includes at least a first principle component generated by a first wireless device and a first interfering component generated by a second wireless device;

receiving a second signal from a second receiver, wherein the second signal includes at least a second principle component generated by the second wireless device and a second interfering component generated by the first wireless device;

decoupling the first principle component generated by the first wireless device from the first interfering component generated by the second wireless device and the second principle component generated by the second wireless device from the second interfering component generated by the first wireless device by simultaneously solving a first linear equation associated with the first signal and a second linear equation associated with the second signal; and

determining a first modulation symbol transmitted by the first wireless device based on the first principle component and a second modulation symbol transmitted by the second wireless device based on the second principle component.

17. The one or more non-transitory computer-readable media of claim 16, wherein the operations further comprise de-mapping the first modulation symbol into a first coded bit sequence associated with the first wireless device and the second modulation symbol into a second coded bit sequence associated with the second wireless device.

18. The one or more non-transitory computer-readable media of claim 17, wherein the operations further comprise removing residual errors by using forward error correction on the first coded bit sequence and the second coded bit sequence.

19. The one or more non-transitory computer-readable media of claim 16, wherein:

the operations further comprise determining channel gains of at least the first principle component and the second principle component, and

wherein the determining the first modulation symbol and the second modulation symbol is further based in part on the channel gains.

20. The one or more non-transitory computer-readable media of claim 16, wherein the operations further comprise:

determining a first signal to interference plus noise power ratio (SINR) for the first signal and a second SINR for the second signal;

determining that the second SINR is larger than the first SINR;

determining, in response to determining that the second SINR is larger than the first SINR, that the second principal component is stronger relative to the second interfering component than the first principal component is relative to the first interfering component; and

offsetting the first interfering component of the first signal using the second principle component of the second signal.