认知无线电网络中的功率控制：如何穿越多车道高速公路
Power Control in Cognitive Radio Networks: How to Cross a Multi-Lane Highway
摘要：
我们认为，在认知无线电网络中，次要用户识别和利用瞬时和本地频谱的机会，而不会造成不可接受的干扰，主要用户的功率控制。我们定性地描述了次用户的发射功率对频谱机会的发生和机会检测的可靠性的影响。基于一级网络的泊松模型，我们量化了这些影响：（i）频谱机会的概率相对于二级用户的传输功率呈指数衰减，其中指数衰减常数由一级用户的业务负载给出;（二）可靠的机会检测是在两个极端的制度方面的传输功率之间的比率的次要用户和的主要用户。这样的分析特征，使我们能够研究功率控制的最佳传输吞吐量的约束下的干扰，主要用户。此外，我们揭示了检测主信号和检测频谱机会之间的差异，并展示了物理层频谱感知和MAC层吞吐量之间的复杂关系。示出了该PHY-MAC交互对应用类型和诸如RTS/CTS的握手信令的使用的依赖性。
英文摘要：
We consider power control in cognitive radio networks where secondary users identify and exploit instantaneous and local spectrum opportunities without causing unacceptable interference to primary users. We qualitatively characterize the impact of the transmission power of secondary users on the occurrence of spectrum opportunities and the reliability of opportunity detection. Based on a Poisson model of the primary network, we quantify these impacts by showing that (i) the probability of spectrum opportunity decreases exponentially with respect to the transmission power of secondary users, where the exponential decay constant is given by the traffic load of primary users; (ii) reliable opportunity detection is achieved in the two extreme regimes in terms of the ratio between the transmission power of secondary users and that of primary users. Such analytical characterizations allow us to study power control for optimal transport throughput under constraints on the interference to primary users. Furthermore, we reveal the difference between detecting primary signals and detecting spectrum opportunities, and demonstrate the complex relationship between physical layer spectrum sensing and MAC layer throughput. The dependency of this PHY-MAC interaction on the application type and the use of handshake signaling such as RTS/CTS is illustrated.
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