APPARATUS AND METHOD FOR INTERFERENCE CANCELLATION IN COMMUNICATION SYSTEMS

• US 20170257180A1
• Filed: 05/23/2017
• Published: 09/07/2017
• Est. Priority Date: 02/19/2013
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Aggarwal, Vaneet, Bharadia, Dinesh, Jana, Rittwik, Rice, Christopher W., Shankaranarayanan, Nemmara K.
• Granted Patent: US 10,116,405 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 11/004 using regenerative subtractive interference cancellation
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0212 of impulse response
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03 Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made of an interference value based on a group of interference signals received at a receiver from a group of transmitters, wherein the interference value is based on channel gains that are estimated for the group of transmitters, and wherein a portion of the interference is self-interference generated from transmitting and receiving at a same time. One of an analog time domain cancellation, a digital time domain cancellation or both, is performed responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver. Other embodiments are disclosed.

Claims

1. A method, comprising:

determining, by a processing system comprising a processor, an interference associated with a group of signals received at a receiver from a group of transmitters, wherein a portion of the interference is self-interference generated from transmitting and receiving at a same time; and

determining, by the processing system, whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters,

wherein an analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range.

2. The method of claim 1, wherein the threshold range of the analog-to-digital converter comprises a dynamic range, and wherein a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range.

3. The method of claim 2, wherein a signal from each of the group of transmitters includes a first set of training symbols that facilitate the digital time domain cancellation and a second set of training symbols that facilitate the analog time domain cancellation.

4. The method of claim 3, wherein a second frequency of the receiver receiving the second set of training symbols for the analog time domain cancellation is greater than a first frequency of the receiver receiving the first set of training symbols for the digital time domain cancellation.

5. The method of claim 1, wherein the analog time domain cancellation is performed on a target interference of the interference that is associated with a subset of the group of transmitters, and further comprising determining, by the processing system, the subset of the group of transmitters based on a detection of whether a transmitter of the group of transmitters is a remote node.

6. The method of claim 1, wherein the analog time domain cancellation is performed on a target interference of the interference that is associated with a subset of the group of transmitters, and further comprising determining, by the processing system, the subset of the group of transmitters based on a detection of whether a receive power level associated with each transmitter of the group of transmitters is below a receive power threshold.

7. The method of claim 6, wherein the target interference comprises the self-interference, and wherein the receive power threshold corresponds to the threshold range of the analog-to-digital converter of the receiver.

8. The method of claim 1, wherein the determining of the interference comprises convolving transmitted data in a time domain.

9. The method of claim 1, wherein a signal of the group of signals is received responsive to a request for training symbols associated with a fault detection in a network over which the group of transmitters operate.

10. The method of claim 1, wherein the group of signals comprises wireless signals, and wherein each signal of the group of signals is received according to a periodic broadcast.

11. The method of claim 1, wherein a portion of the self-interference generated from the transmitting and the receiving at the same time in a same frequency, by a transceiver comprising the receiver and a transmitter of the group of transmitters.

12. The method of claim 1, wherein a communication system comprises a transmitter, the receiver and an antenna system including multiple antennas that enable full duplex operation operatively coupled to the receiver, wherein a portion of the self-interference is generated by a plurality of the multiple antennas.

13. The method of claim 1, wherein the analog time domain cancellation utilizes balun cancellation.

14. A device, comprising:

a memory that stores instructions; and

a processing system including a processor coupled with the memory, wherein responsive to executing the instructions, the processing system facilitates performance of operations comprising;

determining an interference value based on a group of interference signals received at a receiver from a group of transmitters, wherein the interference value is based on channel gains that are estimated for the group of transmitters, and wherein a portion of the interference value is based on self-interference generated from transmitting and receiving at a same time; and

performing one of an analog time domain cancellation, a digital time domain cancellation or both, responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver.

15. The device of claim 14, wherein the operations further comprise:

receiving a group of training symbols via wireless signals from the group of transmitters, wherein the channel gains are estimated based on the group of training symbols; and

performing the digital time domain cancellation without performing the analog time domain cancellation responsive to a determination that the interference value satisfies the threshold range of the analog-to-digital converter.

16. The device of claim 14, wherein the interference value comprises a total interference based on a combination of the group of interference signals, and

wherein the analog time domain cancellation is performed on a target interference of the total interference that is associated with a subset of the group of transmitters, and

wherein the operations further comprise determining the subset of the group of transmitters based on a detection of whether a receive power level associated with each transmitter of the group of transmitters is below a receive power threshold.

17. The device of claim 16, wherein the receive power threshold corresponds to the threshold range of the analog-to-digital converter.

18. The device of claim 14, wherein the analog time domain cancellation is performed on a target interference associated with a subset of the group of transmitters,

wherein the operations further comprise determining the subset of the group of transmitters based on a detection of whether a transmitter of the group of transmitters is a remote node, and

wherein the detection of whether the transmitter is the remote node is based on provisioning information that is accessible to the processor and that identifies the group of transmitters.

19. A machine-readable storage device, comprising instructions, wherein responsive to executing the instructions, a processing system including a processor facilitates performance of operations comprising:

determining an interference value at a receiver based on a group of interference signals received from a group of transmitters, wherein a portion of the interference value is based on self-interference generated from transmitting and receiving at a same time; and

performing an analog time domain cancellation, responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver,

wherein the determining of the interference value is based on channel gains of signals of the group of transmitters.

20. The machine-readable storage device of claim 19, wherein the interference value comprises a total interference based on a combination of the group of interference signals,

wherein the analog time domain cancellation is performed on target interference of the total interference that is associated with a subset of the group of transmitters, and

wherein the operations further comprise determining the subset of the group of transmitters based on a detection of whether a receive power level associated with each transmitter of the group of transmitters is below a receive power threshold.