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SCIENCE CHINA Information Sciences, Volume 59, Issue 4: 042303(2016) https://doi.org/10.1007/s11432-015-5365-z

Self-mixed self-interference analog cancellation in full-duplex communications

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  • ReceivedJun 15, 2015
  • AcceptedAug 11, 2015
  • PublishedFeb 3, 2016

Abstract

Rather than using existing self-interference cancellation methods, which essentially consist of reconstruction and subtraction, this paper proposes a novel approach, based on multiplication, to cancel self-interference in the analog domain in full-duplex communications. This approach is called self-mixed self-interference analog cancellation (SM-SIAC). Moreover, rather than using an individual analog cancellation circuit in existing self-interference cancellation methods, SM-SIAC can merge the analog cancellation circuit and the receiver. SM-SIAC is configured with three auto-tuning loops, consisting of one delay loop and two gain loops. SM-SIAC is further simplified with the Gaussian minimum shift keying (GMSK) self-interference signal. When these loops converge, the paper analyzes the cancellation capacity and derives a closed-form expression for the quadrature amplitude modulation self-interference signal and the GMSK self-interference signal. Simulation results illustrate the convergence of the gain loops and the cancellation capacity in the presence of engineering errors.


Funded by

"source" : null , "contract" : "2014AA01A706"}]

national High-tech R&D Program of China(863 Program)

national Major Projects(2014ZX03003001-002)

national Natural Science Foundation of China(61201266)

national Natural Science Foundation of China(61271164)

"source" : null , "contract" : "2014AA01A704"

national Natural Science Foundation of China(61471108)


Acknowledgment

Acknowledgments

This work was supported by national Natural Science Foundation of China (Grant Nos. 61271164, 61471108, 61201266), national Major Projects (Grant No. 2014ZX03003001-002), and national High-tech R&D Program of China (863 Program) (Grant Nos. 2014AA01A704, 2014AA01A706).


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