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Hybrid SI cancellation for single-antenna full-duplex radios

Hybrid SI cancellation for single-antenna full-duplex radios

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A hybrid self-interference (SI) cancellation scheme, composed of a two-tap analogue canceller and a digital multi-path SI canceller, is proposed for single-antenna full-duplex radios. The analogue canceller mitigates the two strongest components of the SI to prevent saturating the receiver. The digital canceller deploys an auxiliary receiver chain to capture the RF-transmitted signal to mitigate the residual multi-path SI signal. As the proposed scheme uses the RF-transmitted signal as reference, the transceiver impairments such as power amplifier non-linearities and phase noise are suppressed along with the SI. Experiments have validated the effectiveness of the proposed scheme on a 20 MHz long-term evolution signal of +20 dBm power.

References

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        2. Bharadia, D., McMilin, E., Katti, S.: ‘Full duplex radios’. Proc. ACM SIGCOMM, Hong Kong, China, 2013, pp. 375386.
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      • M. Jain , J. Choi , T. Kim .
        3. Jain, M., Choi, J., Kim, T., et al: ‘Practical, real-time, full duplex wireless’. Proc. ACM Mobicom 2011, Las Vegas, NV, USA, September 2011, pp. 301312.
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