A Two-Phase Channel and Power Allocation Scheme for Cognitive Radio Networks
A Two-Phase Channel and Power Allocation Scheme for Cognitive Radio Networks
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DOI：
10.1109/pimrc.2006.254371
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发表时间：
2006-12
期刊：
影响因子：
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通讯作者：
A. Hoang;Ying-Chang Liang
中科院分区：
文献类型：
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作者：
A. Hoang;Ying-Chang Liang
我们考虑一个认知无线电网络，在这个网络中，一组基站进行机会性的未经许可的频谱访问，以向其订户发送数据。由于感兴趣的频谱被许可给另一个(主)网络，因此必须在认知无线电网络内进行功率和信道分配，以便不会对任何主用户造成过多干扰。对于这样的认知网络，我们提出了一种两阶段的信道/功率分配方案，以提高系统吞吐量，吞吐量的定义是可以同时服务的用户总数。在该方案的第一阶段，将信道和功率分配给基站，以最大化其总覆盖，同时将对每个主用户造成的干扰保持在预定义的阈值以下。在第二阶段，每个基站基于最大二部匹配算法为其活动用户分配信道。数值结果表明，我们提出的资源分配方案在系统吞吐量方面有了显著的提高
We consider a cognitive radio network in which a set of base stations make opportunistic unlicensed spectrum access to transmit data to their subscribers. As the spectrum of interest is licensed to another (primary) network, power and channel allocation must be carried out within the cognitive radio network so that no excessive interference is caused to any primary user. For such a cognitive network, we propose a two-phase channel/power allocation scheme that improves the system throughput, defined as the total number of subscribers that can be simultaneously served. In the first phase of our scheme, channels and power are allocated to base stations with the aim of maximizing their total coverage while keeping the interference caused to each primary user below a predefined threshold. In the second phase, each base station allocates channels to their active subscribers based on a maximal bipartite matching algorithm. Numerical results show that our proposed resource allocation scheme yields significant improvement in the system throughput