Receiver, receiver circuits, and methods for providing an interference-reduced signal

• US 8,693,971 B1
• Filed: 12/07/2012
• Issued: 04/08/2014
• Est. Priority Date: 12/07/2012
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Mobile Communications GmbH (Intel Corporation)
• Inventors: Balraj, Rajarajan, Badic, Biljana, Scholand, Tobias
• Primary Examiner(s): Pham, Tuan
• Application Number:
  US13/707,818
• Time in Patent Office: 487 Days
• Field of Search: 455/501, 455/63.1, 455/114.1, 455/114.2, 455/130, 455/296, 455/509, 375/316, 375/346
• US Class Current: 455/296
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Abstract

A receiver is configured to receive a receive signal including a plurality of signal components, each signal component indicating a channel of an antenna port and an associated scrambling sequence, wherein a first one of the channels indicated by a first one of the signal components which is based on a first scrambling sequence is allocated to the receiver for data reception and a second one of the channels indicated by a second one of the signal components which is based on a second scrambling sequence different from the first scrambling sequence is interfering with the allocated channel. The receiver includes an interference reduction unit configured to combine an estimate of the first one of the signal components and an estimate of the second one of the signal components to provide an interference-reduced signal.

Claims

1. A receiver, configured to receive a receive signal comprising a plurality of signal components, wherein each signal component of the plurality of signal components indicates a channel of an antenna port and an associated scrambling sequence, and wherein a first one of the channels indicated by a first one of the signal components which is based on a first scrambling sequence is allocated to the receiver for data reception and a second one of the channels indicated by a second one of the signal components which is based on a second scrambling sequence different from the first scrambling sequence is interfering with the allocated channel, comprising:

an interference reduction unit configured to combine an estimate of the first one of the signal components and an estimate of the second one of the signal components to provide an interference-reduced signal.

2. The receiver of claim 1, further comprising a first channel estimator configured to estimate channel coefficients of the allocated channel based on the interference-reduced signal.

3. The receiver of claim 1, wherein the receive signal comprises a plurality of User Equipment specific reference signals.

4. The receiver of claim 1, wherein the receive signal comprises a plurality of demodulation reference signals.

5. The receiver of claim 1, wherein the first one of the plurality of signal components and the second one of the signal components are non-orthogonal with respect to each other.

6. The receiver of claim 1, further comprising at least two antenna ports for receiving the receive signal.

7. The receiver of claim 6, wherein the at least two antenna ports are based on one of a single layer and a dual layer multi-user multiple input, multiple output (MIMO) transmission.

8. The receiver of claim 6, wherein the at least two antenna ports are based on at least one of LTE transmission modes 8 and 9 or a higher LTE-Advanced transmission mode supporting multi-user or Coordinated Multipoint transmission, or both.

9. The receiver of claim 1, wherein a third one of the channels indicated by a third one of the signal components which is based on the second scrambling sequence and which is transmitted from a different transmission point than the first one of the channels is allocated to the receiver for data reception.

10. The receiver of claim 1, wherein the interference reduction unit comprises another channel estimator configured to determine the estimate of the second one of the signal components based on a combination of the estimate of the first one of the signal components and the receive signal.

11. The receiver of claim 10, wherein the interference reduction unit comprises a first deduction unit configured to combine the estimate of the first one of the signal components and the receive signal by a deduction to form a first combination signal provided to the another channel estimator.

12. The receiver of claim 1, wherein the interference reduction unit is configured to provide the interference-reduced signal based on a combination of the estimate of the second one of the signal components and the receive signal.

13. The receiver of claim 12, wherein the interference reduction unit comprises a second deduction unit configured to combine the estimate of the second one of the signal components and the receive signal by a deduction.

14. The receiver of claim 1, wherein the interference reduction unit comprises a first signal detector configured to detect a third one of the channels indicated by a third one of the signal components which is based on the first scrambling sequence.

15. The receiver of claim 14, wherein the interference reduction unit comprises a first deduction unit configured to deduct the estimate of the first one of the signal components and an estimate of the third one of the signal components from the receive signal.

16. The receiver of claim 15, wherein the interference reduction unit comprises a second signal detector configured to detect a fourth one of the channels indicated by a fourth one of the signal components which is based on the second scrambling sequence.

17. The receiver of claim 16, wherein the interference reduction unit comprises a second deduction unit configured to deduct the estimate of the second one of the signal components and an estimate of the fourth one of the signal components from the receive signal.

18. A receiver circuit, comprising:

at least two antenna ports configured to receive a receive signal comprising a plurality of signal components, wherein each signal component of the plurality of signal components indicates a channel of an antenna port and an associated scrambling sequence, and wherein a first one of the channels indicated by a first one of the signal components which is based on a first scrambling sequence is allocated to the receiver circuit for data reception and a second one of the channels indicated by a second one of the signal components which is based on a second scrambling sequence different from the first scrambling sequence is interfering with the allocated channel, comprising;

an interference reduction unit configured to combine an estimate of the first one of the signal components and an estimate of the second one of the signal components to provide an interference-reduced signal; and

a channel estimator configured to estimate channel coefficients of the allocated channel based on the interference-reduced signal.

19. The receiver circuit of claim 18, wherein the interference reduction unit comprises:

a first channel estimator configured to determine the estimate of the first one of the signal components based on the receive signal; and

a second channel estimator configured to determine the estimate of the second one of the signal components based on a deduction of the estimate of the first one of the signal components from the receive signal.

20. A method, comprising:

receiving a receive signal comprising a plurality of signal components, wherein each signal component of the plurality of signal components indicates a channel of an antenna port and an associated scrambling sequence, wherein a first one of the channels indicated by a first one of the signal components which is based on a first scrambling sequence is allocated for data reception and a second one of the channels indicated by a second one of the signal components which is based on a second scrambling sequence different from the first scrambling sequence is interfering with the allocated channel; and

combining an estimate of the first one of the signal components and an estimate of the second one of the signal components to provide an interference-reduced signal.

21. The method of claim 20, further comprising:

estimating channel coefficients of the allocated channel based on the interference-reduced signal.