DocumentCode :
2366542
Title :
Robust coordinated downlink beamforming for multicell-cognitive radio networks with probabilistic constraints
Author :
Ponukumati, Dhananjaya ; Gao, Feifei ; Bode, Mathias ; Li, James C F ; Lei, Ming
Author_Institution :
Sch. of Eng. & Sci., Jacobs Univ., Bremen, Germany
fYear :
2012
fDate :
10-15 June 2012
Firstpage :
3643
Lastpage :
3647
Abstract :
In this paper, we design downlink (DL) beam-forming vectors for a multiuser multicell cognitive radio (CR) network with imperfect channel state information (CSI) at base stations (BS). Specifically, we model channel estimation error as a random vector with known statistical distribution. Our objective is to minimize the total DL transmit power subject to probabilistic quality of service (QoS) constraints of every secondary user (SU) and primary user (PU). Utilizing Bernstein-type inequalities [12], we replace the probabilistic constraints with conservative deterministic constraints. By applying rank relaxation, the original problem is reformulated as semidefinite programming (SDP). Interestingly, numerical results show that the obtained solutions fulfill the rank constraint.
Keywords :
array signal processing; channel estimation; cognitive radio; error statistics; multiuser channels; optimisation; quality of service; random processes; statistical distributions; BS; Bernstein type inequality; CR; CSI; DL transmit power; PU; QoS; SDP; SU; base station; channel state information; conservative deterministic constraint; coordinated downlink beamforming; model channel estimation error; multiuser multicell cognitive radio network; primary user; probabilistic constraint; quality of service; random vector; rank relaxation; secondary user; semidefinite programming; statistical distribution; Array signal processing; Cognitive radio; Interference; Quality of service; Robustness; Signal to noise ratio; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications (ICC), 2012 IEEE International Conference on
Conference_Location :
Ottawa, ON
ISSN :
1550-3607
Print_ISBN :
978-1-4577-2052-9
Electronic_ISBN :
1550-3607
Type :
conf
DOI :
10.1109/ICC.2012.6363856
Filename :
6363856
Link To Document :
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