Interference-Aware Power Allocation in Cognitive Radio Networks with Imperfect Spectrum Sensing
Interference-Aware Power Allocation in Cognitive Radio Networks with Imperfect Spectrum Sensing
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DOI：
10.1109/icc.2010.5501899
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Sami M. Almalfouh;Gordon L. Stüber
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文献类型：
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作者：
Sami M. Almalfouh;Gordon L. Stüber
本文研究了认知无线电（CR）网络中的下行链路功率分配问题，该网络通过机会主义地利用空闲的授权主用户（PU）频谱来运行，其中假设PU采用OFDMA方案。我们首先分析了由于不完善的频谱感知和CR副载波旁瓣的带外（OOB）发射，CR网络对PU造成的干扰。该功率分配算法以干扰约束下认知无线电网络容量最大为目标，同时考虑了虚警、误检等频谱感知误差的影响。单用户认知无线电网络的功率分配方案是在不同子载波上具有可变水位的注水准则。对于多用户CR网络，我们采用启发式算法来解决功率分配问题，与最优解相比，计算复杂度显着降低。
This paper investigates the problem of downlink power allocation in a Cognitive Radio (CR) network that operates by opportunistically utilizing vacant licensed Primary User (PU)spectrum, where it is assumed the PU employs an OFDMA scheme. We first analyze the interference to the PU caused by the CR network due to imperfect spectrum sensing and out-of-band (OOB) emissions from CR subcarrier side-lobes. The power allocation algorithm aims to maximize the CR network capacity under interference constraints, while considering the effect of spectrum sensing errors such as false alarm and misdetection probabilities. The power allocation solution for a single-user CR network is the waterfilling criteria with a variable water level in different subcarriers. For a multiple-user CR network, we employ a heuristic algorithm to solve the power allocation problem, with a significantly reduced computational complexity as compared to the optimal solution.