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Sökning: swepub > Ottersten Björn 1961 > Kungliga Tekniska Högskolan > Zheng Gan > (2009) > Paulraj Arogyasvsami

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1.
  • Zheng, Gan, et al. (författare)
  • Collaborative-Relay Beamforming with Perfect CSI : Optimum and Distributed Implementation
  • 2009
  • Ingår i: IEEE Signal Processing Letters. - IEEE. - 1070-9908. ; 16:4, s. 257-260
  • Tidskriftsartikel (refereegranskat)abstract
    • This letter studies the collaborative use of amplify-and-forward (AF) relays to form a virtual multiple-input single-output (MISO) beamforming system with the aid of perfect channel state information (CSI) in a flat-fading channel. In particular, we optimize the relay weights jointly to maximize the received signal-to-noise ratio (SNR) at the destination terminal with both individual and total power constraints at the relays. We show that the optimal collaborative-relay beamforming (CRB) solution achieves the full diversity of a MISO antenna system. Another main contribution of this letter is a distributed algorithm that allows each individual relay to learn its own weight, based on the Karush-Kuhn-Tucker (KKT) analysis.
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2.
  • Zheng, Gan, et al. (författare)
  • Robust and distributed beamforming
  • 2009
  • Ingår i: 2009 International Conference on Wireless Communications and Signal Processing. - 978-1-4244-4856-2 ; s. 1629-1633
  • Konferensbidrag (refereegranskat)abstract
    • This paper studies the use of amplify-and-forward (AF) relays for robust beamforming, with the aid of imperfect channel state information (CSI) at the sender. In particular, the maximization of the worst-case signal-to-noise ratio (SNR) at the destination terminal is studied under a bounded spherical region for the norm of CSI error vector. We show that under a condition on the estimated CSI quality, the robust-optimal collaborative-relay beamforming (CRBF) can be obtained by S-Procedure and rank relaxation techniques. In addition, a distributed algorithm is proposed by examining the structure of the optimal CRBF.
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3.
  • Zheng, Gan, et al. (författare)
  • Robust Collaborative-Relay Beamforming
  • 2009
  • Ingår i: IEEE Transactions on Signal Processing. - IEEE. - 1053-587X. ; 57:8, s. 3130-3143
  • Tidskriftsartikel (refereegranskat)abstract
    • Relay communications is a promising technique to extend the range of wireless communications by forwarding the message from the sender to the intended destination. While fixed or variable-power relays have been previously investigated, this paper addresses the collaborative use of variable-phase variable-power amplify-and-forward (AF) relays for robust beamforming, with the aid of imperfect channel state information (CSI) at the sender. In particular, the maximization of the worst-case signal-to-noise ratio (SNR) at the destination terminal is studied under a bounded spherical region for the norm of the CSI error vector from the relays to the destination. Our main contribution is that we prove, under a condition on the quality of the estimated CSI, the robust-optimal collaborative-relay beamforming (CRBF) can be obtained by S-Procedure and rank relaxation techniques. In addition, a distributed algorithm is developed by examining the structure of the optimal CRBF solution. Results demonstrate a significant gain of CRBF over non-robust approaches.
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  • Resultat 1-3 av 3
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