Joint power control and signature design for time-reversal uplinks

In the time reversal division multiple access (TRDMA) system, the signal-to-noise ratio (SNR) is boosted and the inter-user interference (IUI) is suppressed due to the temporal and spatial focusing effects of the time-reversal (TR) technique. However, since the focusing effects highly depend on the location-specific multipath profile, there exists a strong-weak focusing effect in the TRDMA uplink system where different users at different locations enjoy different level of focusing effects. In this paper, we formulate the strong-weak focusing effect in the multiuser TRDMA uplink system as a max-min signal-to-interference-noise ratio (SINR) balancing problem by means of joint power control and signature filter design. A novel two-stage adaptive algorithm that can guarantee the convergence is proposed. Numerical results show that our algorithm converges quickly, achieves a high energy-efficiency gain, and provides a performance guarantee to all users.

[1]  K. J. Ray Liu,et al.  Time-Reversal Wideband Communications , 2013, IEEE Signal Processing Letters.

[2]  G. Lerosey,et al.  Time reversal of electromagnetic waves and telecommunication , 2005 .

[3]  Yvonne Freeh,et al.  Non Negative Matrices And Markov Chains Springer Series In Statistics , 2016 .

[4]  G. Lerosey,et al.  Time reversal of wideband microwaves , 2006 .

[5]  K. J. Ray Liu,et al.  Time-Reversal Division Multiple Access over Multi-Path Channels , 2012, IEEE Transactions on Communications.

[6]  M. Fink,et al.  Time reversal of ultrasonic fields. I. Basic principles , 1992, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[7]  G. Lerosey,et al.  Theory of Electromagnetic Time-Reversal Mirrors , 2010, IEEE Transactions on Antennas and Propagation.

[8]  Alexander V. Arhangel'skii,et al.  General topology I: Basic concepts and constructions dimension theory , 1990 .

[9]  W. Kuperman,et al.  Iterative time reversal in the ocean , 1997 .

[10]  M. Fink,et al.  Self focusing in inhomogeneous media with time reversal acoustic mirrors , 1989, Proceedings., IEEE Ultrasonics Symposium,.

[11]  Christopher D. Jones,et al.  Underwater acoustic communication by passive-phase conjugation: theory and experimental results , 2001 .

[12]  M. Fink,et al.  Time reversal of ultrasonic fields. Il. Experimental results , 1992, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[13]  Theodore S. Rappaport,et al.  Wireless communications - principles and practice , 1996 .

[14]  K. J. Ray Liu,et al.  Green Wireless Communications: A Time-Reversal Paradigm , 2011, IEEE Journal on Selected Areas in Communications.

[15]  Weidong Yang,et al.  Optimal downlink power assignment for smart antenna systems , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[16]  K. J. Ray Liu,et al.  Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview , 2014, IEEE Internet of Things Journal.

[17]  W. Kuperman,et al.  Phase conjugation in the ocean: Experimental demonstration of an acoustic time-reversal mirror , 1998 .