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
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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
期刊:
影响因子:
1.6
通讯作者:
ong
ong
中科院分区:
计算机科学4区
文献类型:
--
作者:
Dong, Quan;Li, Ji;ong

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为了有效利用无线网络频谱,认知网络中次要用户(SU)通常被授权与主要用户(PU)共享频谱。为了保证PU和SU的有效传输,限制SU对PU的干扰,并且只有信息率(速率)高于相应阈值的SU才允许传输其数据。为了在速率要求和干扰约束下选择合适的 SU 进行传输并最大化其可实现的加权和速率 (WSR),作者提出了一种针对部分信道状态信息 (CSI) 情况的联合准入控制和波束成形设计算法。首先根据CSI的统计特性,利用近似和凸松弛来构造WSR最大化问题。然后引入惩罚因子来检查该问题的可行性并指导SU的接纳。除了可行的 SU 集之外,通过使用速率分布技术和多块外近似方法更新每个用户的可实现速率来最大化 WSR。仿真结果表明,与现有基线方法的波束形成相比,所提出的波束形成可以获得更高的WSR。
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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