Cooperative Spectrum Access Towards Secure Information Transfer for CRNs
Cooperative Spectrum Access Towards Secure Information Transfer for CRNs
复制标题
DOI：
10.1109/jsac.2013.131130
复制
发表时间：
2013-10
影响因子：
16.4
通讯作者：
Ning Zhang;N. Lu;Nan Cheng;J. Mark;Xuemin Shen
中科院分区：
文献类型：
--
作者：
Ning Zhang;N. Lu;Nan Cheng;J. Mark;Xuemin Shen
在认知无线电网络（CRN）中，安全的信息传输对于主用户（PU）来说至关重要，而次用户（SU）则主要希望缓解传输机会的匮乏。为了满足这些不同的要求，可以利用执行单位和执行单位之间的合作，从而创造双赢局面。在本文中，我们研究合作频谱接入的CRN，其目标是提高安全传输的PU通过合作的SU，这将激励一定的传输机会。提出了两种类型的协作方案，其中PU与两个单独的SU或SU的集群协作，其分别被称为中继干扰器（R-J）方案和集群波束成形（C-B）方案。在R-J方案中，两个单独的SU充当中继和友好干扰器以提高PU的保密性;作为回报，PU分配一部分接入时间用于SU的传输。为了达到最大的保密率，联合时间和功率分配被认为是。特别地，协作中继和干扰机确定最佳发射功率，而PU决定最佳时间分配策略。在C-B方案中，PU与一簇SU通过协作波束形成来增强主链路的保密性，分别针对有一个窃听者、有多个窃听者和没有窃听者信息的情况提出了三种不同的方法。为了最大化保密率，还研究了权值选择和时间分配问题。仿真结果验证了所提出的方案，并表明PU可以显着提高通过合作的秘密性。
In cognitive radio networks (CRNs), secure information transfer is of paramount importance for primary users (PUs), while secondary users (SUs) mainly desire to ease the starvation for transmission opportunities. To meet such different requirements, cooperation between PUs and SUs can be leveraged and therefore create a win-win situation. In this paper, we investigate cooperative spectrum access for CRNs, which targets to improve the secure transmission of PUs via cooperating SUs that would be incented by certain transmission opportunities. Two types of cooperation schemes are proposed, whereby the PU either cooperates with two individual SUs or a cluster of SUs, which are referred to as relay-jammer (R-J) scheme and cluster-beamforming (C-B) scheme, respectively. In R-J scheme, two individual SUs act as a relay and a friendly jammer to improve the PU's secrecy; In return, the PU allocates a fraction of access time for the SUs' transmission. To achieve the maximum secrecy rate, joint time and power allocation is considered. Particularly, the cooperating relay and jammer determine the optimal transmission power, while the PU decides the optimal time allocation strategy. In C-B scheme, the PU cooperates with a cluster of SUs to enhance the secrecy of the primary link via collaborative beamforming, where three different approaches are proposed for the scenarios with one eavesdropper, with multiple eavesdroppers, and without eavesdroppers' information, respectively. To maximize the secrecy rate, the weight selection and time allocation are also studied. Simulation results are given to validate the proposed schemes and demonstrate that the PU can significantly enhance the secrecy through cooperation.