Gan Zheng and Kai-Kit Wong and Paulraj, A and Ottersten, B (2009) Robust Collaborative-Relay Beamforming. IEEE Transactions on Signal Processing, 57 (8). pp. 3130-3143. DOI https://doi.org/10.1109/tsp.2009.2021456
Gan Zheng and Kai-Kit Wong and Paulraj, A and Ottersten, B (2009) Robust Collaborative-Relay Beamforming. IEEE Transactions on Signal Processing, 57 (8). pp. 3130-3143. DOI https://doi.org/10.1109/tsp.2009.2021456
Gan Zheng and Kai-Kit Wong and Paulraj, A and Ottersten, B (2009) Robust Collaborative-Relay Beamforming. IEEE Transactions on Signal Processing, 57 (8). pp. 3130-3143. DOI https://doi.org/10.1109/tsp.2009.2021456
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.
Item Type: | Article |
---|---|
Subjects: | Q Science > QA Mathematics > QA75 Electronic computers. Computer science |
Divisions: | Faculty of Science and Health > Computer Science and Electronic Engineering, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 19 Nov 2013 17:45 |
Last Modified: | 05 Dec 2024 11:51 |
URI: | http://repository.essex.ac.uk/id/eprint/8538 |