SCIENCE CHINA Information Sciences, Volume 60, Issue 10: 102302(2017) https://doi.org/10.1007/s11432-016-0291-9

Novel multi-tap analog self-interference cancellation architecture with shared phase-shifter for full-duplex communications

More info
  • ReceivedJun 14, 2016
  • AcceptedSep 30, 2016
  • PublishedMar 28, 2017


Multi-tap analog self-interference (SI) cancellation structures adopt parallel taps to reconstruct and then cancel SI in full-duplex radios. Each tap is usually comprised of one fixed delay line, one variable attenuator, and one optional variable phase shifter. To balance the quantity of the variable phase shifters and the achievable SI cancellation (SIC) performance, this paper proposes a novel analog SIC cancellation structure, called shared-phase-shifter constrained multi-tap structure (SMTS). In the proposed architecture, all taps share one phase shifter to emulate the dominated phase offset of the SI channel, which reduces the complexity of the implementation of the multi-tap analog SIC structure and avoids the SIC performance degradation. Then, the proposed SMTS and the existing structures are compared in terms of SIC performance and power dissipation. Finally, extensive simulations show that SMTS provides the close-to-optimal SIC performance as well as the lowest power dissipation relative to the existing multi-tap structures.


This work was supported by National Natural Science Foundation of China (Grant Nos. 61531009, 61501093, 61271164, 61471108) and Fundamental Research Funds for the Central Universities.


[1] Zhang Z, Long K, Vasilakos A V. Full-Duplex Wireless Communications: Challenges, Solutions, and Future Research Directions. Proc IEEE, 2016, 104: 1369-1409 CrossRef Google Scholar

[2] Ma Z, Zhang Z Q, Ding Z G, et al. Key techniques for 5G wireless communications: network architecture, physical layer, and MAC layer perspectives. Sci China Inf Sci, 2015, 58: 041301. Google Scholar

[3] Lu H, Shao S, Deng K. Self-mixed self-interference analog cancellation in full-duplex communications. Sci China Inf Sci, 2016, 59: 042303 CrossRef Google Scholar

[4] Zhang G P, Yang K, Liu P, et al. Using full duplex relaying in device-to-device (D2D) based wireless multicast services: a two-user case. Sci China Inf Sci, 2015, 58: 082301. Google Scholar

[5] Zhang Z L, Shen Y, Shao S H, et al. Full duplex 2$\times$2 MIMO radios. In: Proceedings of International Conference on Wireless Communications and Signal Processing (WCSP'14), Hefei, 2014. 1--6. Google Scholar

[6] Kolodziej K E, McMichael J G, Perry B T. Adaptive RF canceller for transmit-receive isolation improvement. In: Proceedings of IEEE Radio and Wireless Symposium (RWS'14), Newport Beach, 2014. 172--174. Google Scholar

[7] Chen T Y, Liu S. A multi-stage self-interference canceller for full-duplex wireless communications. In: Proceedings of IEEE Global Communications Conference (GLOBECOM'15), San Diego, 2015. 1--6. Google Scholar

[8] Kolodziej K E, McMichael J G, Perry B T. Multitap RF Canceller for In-Band Full-Duplex Wireless Communications. IEEE Trans Wireless Commun, 2016, 15: 4321-4334 CrossRef Google Scholar

[9] Choi J, Jain M, Srinivasan K, et al. Achieving single channel, full duplex wireless communication. In: Proceedings of the 16th Annual International Conference on Mobile Computing and Networking (MobiCom'10), Chicago, 2010. 1--12. Google Scholar

[10] Jain M, Choi J I, Kim T, et al. Practical, real-time, full duplex wireless. In: Proceedings of the 17th Annual International Conference on Mobile Computing and Networking (MobiCom'11), Las Vegas, 2011. 301--312. Google Scholar

[11] Bharadia D, Mcmilin E, Katti S. Full duplex radios. In: Proceedings of the ACM SIGCOMM 2013 Conference (SIGCOMM'13), Hong Kong, 2013. 375--386. Google Scholar

[12] Bharadia D, Katti S. Full duplex MIMO radios. In: Proceedings of the 11th USENIX Conference on Networked Systems Design and Implementation (NSDI'14), Seattle, 2014. 359--372. Google Scholar

[13] Mayer U, Wickert M, Eickhoff R. 2-6-GHz BiCMOS Polar-Based Vector Modulator for S- and C-Band Diversity Receivers. IEEE Trans Microwave Theor Techn, 2012, 60: 567-573 CrossRef ADS Google Scholar

[14] Wu X Y. The measurement and analysis of the co-time co-frequency full-duplex self-interference channel. Dissertation for the Doctoral Degree. Chengdu: University of Electronic Science and Technology of China, 2015. 40--41, 66--67. Google Scholar

[15] Sahai A, Patel G, Dick C. On the Impact of Phase Noise on Active Cancelation in Wireless Full-Duplex. IEEE Trans Veh Technol, 2013, 62: 4494-4510 CrossRef Google Scholar

[16] Hua Y, Ma Y, Gholian A. Radio self-interference cancellation by transmit beamforming, all-analog cancellation and blind digital tuning. Signal Processing, 2015, 108: 322-340 CrossRef Google Scholar

[17] Goldsmith A. Wireless Communications. New York: Cambridge University Press, 2005. 26--27. Google Scholar

[18] Xu H X, Wang G M, Lu K. Microstrip rat-race couplers. IEEE Microw Mag, 2011, 12: 117--129. Google Scholar

[19] Boyd S, Vandenberghe L. Convex Optimization. Cambridge: Cambridage University Press, 2004. 457--520, 153--154. Google Scholar

[20] Gradshteyn I S, Ryzhik I M. Table of Integrals, Series, and Products. 7th ed. CA: Scripta Technica, 2007. 1081--1091. Google Scholar

[21] Petersen K B, Pedersen M S. The Matrix Cookbook. Massachusetts Institute of Technology (MIT) Tech Rep. 2012. Google Scholar

  • Figure 1

    Multi-tap analog SIC schemes. (a) CMTS; (b) DMTS.

  • Figure 2

    The proposed SMTS.

  • Figure 3

    Design of the reconfigurable power combiner array. (a) Structure of a SuDiC; (b) structure of the proposed reconfigurable power combiner array, where $x_i$ represents the signal from the $i$th tap.

  • Figure 4

    (a) Considered FD transceiver frontend; (b) power delay profile of SI channel.

  • Figure 5

    (Color online) Convergence of the developed numerical algorithm with 7 taps, i.e., $N=7$. (a) $G_\text{SMTS}$ vs. iteration time for 20-MHz SI; (b) $G_\text{SMTS}$ vs. iteration time for 100-MHz SI; (c) $\phi$ vs. iteration time for 20-MHz SI; (d) $\phi$ vs. iteration time for 100-MHz SI.

  • Figure 6

    (Color online) SIC performance vs. tap number. (a) 20-MHz SI; (b) 100-MHz SI.

  • Figure 7

    (Color online) CDF of SIC performance. (a) 20-MHz SI and $N=3$; (b) 20-MHz SI and $N=5$; (c) 20-MHz SI and $N=7$; (d) 100-MHz SI and $N=3$; (e) 100-MHz SI and $N=5$; (f) 100-MHz SI and $N=7$. Simulations are performed by 3000 times.

  • Figure 8

    (Color online) Coupling channel. The tap number is 7, i.e., $N=7$. (a) Magnitude response with 20-MHz SI; (b) magnitude response with 100-MHz SI; (c) time domain response with 20-MHz SI; (d) time domain response with 100-MHz SI.

  • Figure 9

    (Color online) CDF of reconstruction power efficiency. The delay interval of the delay lines is $\Delta\tau=4$ ns. (a) 20-MHz SI and $N=3$; (b) 20-MHz SI and $N=5$; (c) 20-MHz SI and $N=7$; (d) 100-MHz SI and $N=3$; (e) 100-MHz SI and $N=5$; (f) 100-MHz SI and $N=7$. Simulations are performed by 3000 times.


    Algorithm 1 The numerical algorithm to solve (10)

    Require:Given threshold $P_\text{th}$, one temporary variable $k$;

    $\boldsymbol{\tilde{A}}_0\Leftarrow0$, $P_\text{e}(0)\Leftarrow {{{P}_{\text{tx}}}}I_{\text{t/r}}$, $\phi_0\Leftarrow0$, $k\Leftarrow0$;


    $k\Leftarrow k+1$;

    $\boldsymbol{\tilde{A}}_k\Leftarrow\textrm{Re}\{\boldsymbol{O}^\text{H}\boldsymbol{R}_b\boldsymbol{O}\}^{-1}\textrm{Re}\{\boldsymbol{O}^\text{H}\boldsymbol{C}_b\boldsymbol{Q}\boldsymbol{H}\exp(-\text{j} \phi_{k-1})\}$;


    $P_\text{e}(k)\Leftarrow{{{P}_{\text{tx}}}}(I_{\text{t/r}}-\textrm{Re}\{\boldsymbol{H}^\text{H}\boldsymbol{Q}^\text{H}\boldsymbol{C}^\text{H}_b\boldsymbol{O}\boldsymbol{\tilde{A}}_k\exp(\text{j} \phi_k)\}+\boldsymbol{\tilde{A}}_k^\text{T}\boldsymbol{O}^\text{H}\boldsymbol{R}_b\boldsymbol{O}\boldsymbol{\tilde{A}}_k)$;

    until $\|P_\text{e}(k)-P_\text{e}(k-1)\|\le P_\text{th}$

Copyright 2019 Science China Press Co., Ltd. 《中国科学》杂志社有限责任公司 版权所有