Joint admission control and beamforming design for the interference cognitive radio network with partial channel state information case
Joint admission control and beamforming design for the interference cognitive radio network with partial channel state information case
复制标题
具有部分信道状态信息情况的干扰认知无线电网络联合准入控制与波束成形设计
DOI:
10.1049/iet-com.2014.0859
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发表时间:
2015-06
影响因子:
1.6
通讯作者:
ong
中科院分区:
文献类型:
--
作者:
Dong, Quan;Li, Ji;ong
In order to effectively utilise the spectrum of wireless network, secondary users (SUs) are often authorised to share spectrum with primary users (PUs) in cognitive networks. To guarantee effective transmission of PUs and SUs, the interference from the SUs to the PUs is limited and only the SUs that have the information rates (rates) than the corresponding thresholds are allowed to transmit their data. In order to select proper SUs to transmit and to maximise their achievable weighted sum rate (WSR) under rate requirement and interference constraint, the authors propose a joint admission control and beamforming design algorithm for partial channel state information (CSI) case. The WSR maximisation problem is first constructed by using approximation and convex relaxation, according to the statistical property of the CSI. Then a penalty factor is introduced to check the feasibility of such problem and instruct the admission of the SUs. Beyond the feasible SUs set, the WSR is maximised by updating the achievable rate of each user with rate profile technique and polyblock outer approximation method. Simulation results show that the proposed beamforming can achieve higher WSR than the beamforming of the existing baseline method.
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