Title :
Outage probability constrained robust downlink collaborative beamforming
Author :
Zheng, Dong ; Liu, Ju ; Chen, He ; Xu, Hongji ; Zheng, Lina
Author_Institution :
Sch. of Inf. Sci. & Eng., Shandong Univ., Jinan, China
Abstract :
We consider a downlink collaborative relay network where communication between the base station and the terminal node is assisted by a cluster of relay nodes with imperfect channel state information (CSI). The equivalent condition for the probability constraint on the signal-to-noise-ratio (SNR) is derived, by modeling the CSI uncertainties as Gaussian. Though the original problem is quite intractable, it could be effectively solved by working out an semidefinite programming (SDP) iteratively. Subsequently, computer simulations are carried out to validate our approach compared with the non-robust design techniques. Simulation results show that, the quality-of-service (QoS) can be guaranteed in statistical sense for the proposed approach while violated by the non-robust solution.
Keywords :
Gaussian processes; array signal processing; diversity reception; iterative methods; mathematical programming; probability; quality of service; CSI uncertainty modeling; Gaussian; QoS guarantee; SNR; base station; computer simulations; downlink collaborative relay network; imperfect channel state information; iterative SDP; nonrobust design techniques; outage probability constraint; quality of service; relay node cluster; robust downlink collaborative beamforming; semidefinite programming; signal-to-noise-ratio; statistical sense; terminal node; Array signal processing; Downlink; Optimization; Quality of service; Relays; Robustness; Signal to noise ratio; Collaborative beamforming; SDP; robust;
Conference_Titel :
Wireless Communications and Signal Processing (WCSP), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4577-1009-4
Electronic_ISBN :
978-1-4577-1008-7
DOI :
10.1109/WCSP.2011.6096757