Apparatus and method for reducing self-interference in a radio system

• US 8,498,585 B2
• Filed: 07/22/2009
• Issued: 07/30/2013
• Est. Priority Date: 07/22/2008
• 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: Vandenameele, Patrick
• Primary Examiner(s): Alam, Fayyaz
• Assistant Examiner(s): Rachedine, Mohammed
• Application Number:
  US12/507,206
• Publication Number:
  US 20100022201A1
• Time in Patent Office: 1,469 Days
• Field of Search: None
• US Class Current: 455/78
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 25/0248 Eigen-space methods

Abstract

Full duplex radio wireless systems and methods and especially transceivers for full duplex radio wireless systems with reduction of self-interference are described. MIMO (=multiple input multiple output several antennas for output and input) is used within one device with multiple antennas to remove self-interference in a proactive way. For example, a transceiver is described having self-interference suppression, comprising, within one transceiver device: two or more transmitters comprising one or more signal generators for transmitting transmit signals having transmit center frequencies in a selected first subchannel; and one or more receivers having receiver inputs for simultaneously receiving a desired receive signal in a second subchannel and an undesired accumulated interference signal due to said transmitted signals; and at least one of said transmitters also comprising a precompensation circuit that modifies the transmit signals such that said accumulated interference signal at the receiver(s) inputs is reduced.

Claims

1. A transceiver for self-interference suppression, comprising, within one transceiver device:

two or more transmitters comprising one or more signal generators for transmitting transmit signals having transmit center frequencies in a selected first subchannel, wherein each of the two or more transmitters is dedicated for a different antenna; and

a receiver corresponding to the same antenna as one of the two or more transmitters and having receiver inputs for simultaneously receiving a desired receive signal in a second subchannel and an undesired accumulated interference signal due to said transmitted signals from the two or more transmitters;

wherein at least one of said transmitters that is associated with an antenna other than the antenna corresponding to the receiver is associated with a precompensation circuit that modifies the transmit signals such that said accumulated interference signal at the receiver inputs is reduced.

2. The transceiver of claim 1, further comprising:

a baseband processor generating a transmit signal, the two or more transmitters being coupled to said baseband processor.

3. The transceiver of claim 1, wherein:

the precompensation circuit is adapted to modify the amplitude and phase of the transmit signals.

4. The transceiver of claim 1, wherein:

the precompensation circuit is adapted to split the transmit signals in frequency bands and modifies the amplitude and phase of the split transmit signals in each of the frequency bands.

5. The transceiver of claim 1, wherein:

an estimation circuit is used to help determine the precompensation circuit operation.

6. The transceiver of claim 1, wherein:

the precompensation circuit is adjusted dynamically and an estimation circuit is used to adaptively determine the optimal precompensation circuit operation.

7. The transceiver of claim 5, wherein:

the estimation circuit is adapted to estimate the transfer function of the transmitted transmit signals onto the receiver input and to model it as a linear relationship, resulting in a propagation matrix;

the precompensation circuit also being adapted to use the right singular vector of the associated propagation matrix.

8. A method of providing self-interference suppression for a transceiver, wherein one transceiver device includes two or transmitters comprising one or more signal generators for transmitting said transmit signals having transmit center frequencies in a selected first subchannel, wherein each of the two or more transmitters is dedicated for a different antenna;

and, a receiver corresponding to the same antenna as one of the two or more transmitters and having receiver inputs for simultaneously receiving a desired receive signal in a second subchannel and an undesired accumulated interference signal due to said transmitted signals from the two or more transmitters, the method comprising;

modifying one or more of the transmit signals that are associated with antennas other than the antenna corresponding to the receiver such that said accumulated interference signal at the receiver inputs is reduced.

9. The method of claim 8, wherein modifying the transmit signals includes modifying the amplitude and phase of the transmit signals.

10. The method of claim 8, wherein:

modifying the transmit signals includes splitting the transmit signals in frequency bands and modifying the amplitude and phase of the split transmit signals in each of the frequency bands.

11. The method of claim 8, wherein:

modifying the transmit signals is adjusted dynamically.

12. The method of claim 11, further comprising:

estimating the transfer function of the transmitted transmit signals onto the receiver input and modeling it as a linear relationship, resulting in a propagation matrix; and

modifying the transmit signals uses the right singular vector of the associated propagation matrix.

13. A computer program product comprising code segments, which when executed on a processing engine, execute a method of providing self-interference suppression for a transceiver, wherein one transceiver device includes two or transmitters comprising one or more signal generators for transmitting said transmit signals having transmit center frequencies in a selected first subchannel, wherein each of the two or more transmitters is dedicated for a different antenna;

and, a receiver corresponding to the same antenna as one of the two or more transmitters and having receiver inputs for simultaneously receiving a desired receive signal in a second subchannel and an undesired accumulated interference signal due to said transmitted signals from the two or more transmitters, the method comprising;

modifying one or more of the transmit signals that are associated with antennas other than the antenna corresponding to the receiver such that said accumulated interference signal at the receiver inputs is reduced.

14. The computer program product of claim 13, further comprising code segments adapted for modifying the transmit signals by modifying the amplitude and phase of the transmit signals.

15. The computer program product of claim 13, further comprising code segments adapted for modifying the transmit signals by splitting the transmit signals in frequency bands and modifying the amplitude and phase of the split transmit signals in each of the frequency bands.

16. The computer program product of claim 13, further comprising code segments adapted for dynamically adjusting the modification of the transmit signals.

17. The computer program product of claim 13, further comprising code segments adapted for estimating the transfer function of the transmitted transmit signals onto the receiver input and modeling it as a linear relationship, resulting in a propagation matrix;

and modifying the transmit signals uses the right singular vector of the associated propagation matrix.

18. A machine readable signal storage medium storing the computer program product of claim 13.

19. An integrated circuit for self-interference suppression for use with a transceiver, whereby within one transceiver device there is provided two or more transmitters comprising one or more signal generators for transmitting transmit signals having transmit center frequencies in a selected first subchannel, wherein each of the two or more transmitters is dedicated for a different antenna;

and, a receiver corresponding to the same antenna as one of the two or more transmitters and having receiver inputs for simultaneously receiving a desired receive signal in a second subchannel and an undesired accumulated interference signal due to said transmitted signals from the two or more transmitters, the integrated circuit comprising;

a unit configured to implement a precompensation function that modifies one or more of the transmit signals that are associated with antennas other than the antenna corresponding to the receiver such that said accumulated interference signal at the receiver inputs is reduced.