METHOD AND APPARATUS FOR INTERFERENCE CANCELLATION FOR ANTENNA ARRAYS

• US 20130089009A1
• Filed: 10/11/2011
• Published: 04/11/2013
• Est. Priority Date: 09/19/2011
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Li, Li Erran, Marzetta, Thomas
• Granted Patent: US 9,124,475 B2
• Time in Patent Office: Days
• US Class Current: 370/278
• CPC Class Codes: H04B 7/14 Relay systems
• CPC Class Codes: H04L 25/03305 Joint sequence estimation and interference removal joint detection of several desired signals H04L25/03331
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Abstract

Embodiments of the claimed subject matter provide methods and apparatuses for interference cancellation. One embodiment of a method includes estimating, for an antenna in an antenna array including a plurality of antennas, interference parameters using analog signals received at the antenna on each of a plurality of subcarriers. Each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers. This embodiment also includes canceling interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters.

Claims

1. A method, comprising:

estimating, for an antenna in an antenna array comprising a plurality of antennas, interference parameters using analog signals received at the antenna on each of a plurality of subcarriers, wherein each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers; and

canceling interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters.

2. The method of claim 1, wherein the number of interference parameters for the antenna is independent of the number of other antennas in the antenna array.

3. The method of claim 1, wherein estimating the interference parameters comprises estimating the interference parameters to minimize differences between the analog signals received at the antenna and products of the interference parameters and the corresponding symbols.

4. The method of claim 1, wherein canceling interference from the analog signals received by the antenna comprises canceling interference from a baseband signal received by the antenna.

5. The method of claim 1, wherein canceling interference from the analog signals received by the antenna comprises canceling interference from a radiofrequency signal received by the antenna.

6. The method of claim 1, comprising converting the analog signals to digital signals after canceling the interference from the analog signals.

7. The method of claim 6, wherein estimating the interference parameters comprises estimating the interference parameters based upon the digital signals.

8. The method of claim 1, comprising pre-coding the plurality of symbols for transmission over the air interface concurrently with canceling interference from the analog signals received by the antenna on the plurality of subcarriers.

9. The method of claim 8, comprising transmitting the plurality of symbols in full-duplex mode and concurrently receiving uplink signals from the plurality of users transmitting in full-duplex mode.

10. The method of claim 8, comprising transmitting the plurality of symbols in full-duplex mode and concurrently receiving uplink signals from subsets of the plurality of users transmitting in half-duplex mode.

11. The method of claim 10, comprising scheduling the subsets of users for reception or transmission in half-duplex mode based on at least one of an estimate of inter-user interference or locations of the users.

12. The method of claim 1, comprising estimating interference parameters for each antenna in the antenna array and canceling interference from analog signals received by the plurality of antennas in the antenna array using the estimated interference parameters.

13. A transceiver configured to be communicatively coupled to an antenna in an antenna array comprising a plurality of antennas, wherein the transceiver comprises:

adaptive interference logic configured to estimate interference parameters using analog signals received at the antenna on each of a plurality of subcarriers, wherein each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers, and

circuitry configured to cancel interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters.

14. The transceiver of claim 13, wherein the number of interference parameters for the antenna is independent of the number of other antennas in the antenna array.

15. The transceiver of claim 13, wherein the adaptive interference logic is configured to estimate the interference parameters to minimize differences between the analog signals received at the antenna and products of the interference parameters and the corresponding symbols.

16. The transceiver of claim 13, wherein said circuitry is configured to cancel interference from at least one of a baseband signal received by the antenna or a radiofrequency signal received by the antenna.

17. The transceiver of claim 13, comprising receive circuitry configured to convert the analog signals to digital signals after canceling the interference from the analog signals.

18. The transceiver of claim 17, wherein the receive circuitry is configured to provide feedback based upon the digital signals to the adaptive interference logic, and wherein the adaptive interference logic is configured to estimate the interference parameters based upon the feedback.

19. The transceiver of claim 13, comprising transmit circuitry configured to pre-code the plurality of symbols for transmission over the air interface concurrently with the adaptive interference logic canceling interference from the analog signals received by the antenna on the plurality of subcarriers.

20. The transceiver of claim 19, wherein the transmit circuitry is configured to transmit the plurality of symbols in full-duplex mode and wherein the receive circuitry is configured to concurrently receive uplink signals from the plurality of users transmitting in full-duplex mode.

21. The transceiver of claim 19, wherein the transmit circuitry is configured to transmit the plurality of symbols in full-duplex mode and wherein the receive circuitry is configured to concurrently receive uplink signals from subsets of the plurality of users transmitting in half-duplex mode.

22. The transceiver of claim 21, wherein the transceiver is configured to schedule the subsets of users for reception or transmission in half-duplex mode based on estimates of at least one of inter-user interference or locations of the users.

23. A system comprising:

a plurality of transceivers, wherein each of the plurality of transceivers is configured to be communicatively coupled to one of a plurality of antennas in an antenna array, and wherein each transceiver comprises;

adaptive interference logic configured to estimate interference parameters using analog signals received at the antenna on each of a plurality of subcarriers, wherein each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers, and

circuitry configured to cancel interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters.

24. An apparatus, comprising:

means for estimating, for an antenna in an antenna array comprising a plurality of antennas, interference parameters using analog signals received at the antenna on each of a plurality of subcarriers, wherein each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers; and

means for canceling interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters.