Method For A canceling Self Interference Signal Using Passive Noise Cancellation For Full-Duplex Simultaneous (in Time) and Overlapping (In Space) Wireless transmission and Reception On The Same Frequency Band

• US 20120155336A1
• Filed: 12/13/2011
• Published: 06/21/2012
• Est. Priority Date: 12/13/2010
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Laboratories America Inc (NEC Corporation)
• Inventors: Khojastepour, Mohammad A., Sundaresan, Karthikeyan, Rangarajan, Sampath
• Granted Patent: US 8,837,332 B2
• Time in Patent Office: Days
• US Class Current: 370/278
• CPC Class Codes: H01Q 21/00 Antenna arrays or systems arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

A method for full duplex communication that includes creating a canceling self interference signal using a passive noise cancellation, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal.

Claims

1. A method for full duplex communication comprising the steps of:

creating a canceling self interference signal using a passive noise cancellation; and

attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal.

2. The method of claim 1, wherein said passive noise cancellation comprises analog noise canceller circuits in multiple stages.

3. The method of claim 2, wherein the self-interference cancellation is a noise cancellation that is passive and performed successively.

4. The method of claim 2, wherein a residual of the self-interference signal in the output of each of said multiple stages is cancelled by subtracting an attenuated version of transmitted signal from it.

5. The method of claim 4, wherein the average power of the output signal at each stage is minimized.

6. The method of claim 1, wherein said passive noise cancellation comprises digital noise canceller algorithms.