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arXiv 1802.01088cs.ITcs.NImath.IT
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Sense-and-Predict:认知无线电网络中的空间干扰相关性利用

Sense-and-Predict: Harnessing Spatial Interference Correlation for Cognitive Radio Networks

Seunghwan Kim, Han Cha, Jeemin Kim, Seung-Woo Ko, Seong-Lyun Kim

摘要:

认知无线电(CR)是实现未来网络的关键使能器,通过允许不同无线网络之间的频谱共享来实现更高的频谱效率。探索频谱接入机会是否可用是重要的,但是基于发射机(TX)感测的传统CR不能用于此目的,因为配对的接收机(RX)可能根据它们的分离、阻塞和波束方向的程度而经历不同水平的干扰。为了解决这个问题,本文提出了一种新的形式的媒体访问控制(MAC)称为感测和预测(SaP),其中每个辅助TX预测在RX的干扰水平的基础上感测到的干扰在TX,这可以量化的两个位置之间的空间干扰相关性。使用随机几何,空间干扰相关性可以以条件覆盖概率的形式表示,使得RX处的信号干扰比(SIR)不小于给定TX处的感测到的干扰的预定阈值,该预定阈值被定义为机会概率(OP)。次级TX随机接入频谱取决于OP。我们优化的SaP框架,以最大限度地提高二级网络的区域频谱效率(ASES),同时保证主网络的服务质量。使用USRP和MATLAB仿真的测试床实验表明,与没有预测的CR相比,SaP提供了更高的ASE。

英文摘要:

Cognitive radio (CR) is a key enabler realizing future networks to achieve higher spectral efficiency by allowing spectrum sharing between different wireless networks. It is important to explore whether spectrum access opportunities are available, but conventional CR based on transmitter (TX) sensing cannot be used to this end because the paired receiver (RX) may experience different levels of interference, according to the extent of their separation, blockages, and beam directions. To address this problem, this paper proposes a novel form of medium access control (MAC) termed sense-and-predict (SaP), whereby each secondary TX predicts the interference level at the RX based on the sensed interference at the TX; this can be quantified in terms of a spatial interference correlation between the two locations. Using stochastic geometry, the spatial interference correlation can be expressed in the form of a conditional coverage probability, such that the signal-to-interference ratio (SIR) at the RX is no less than a predetermined threshold given the sensed interference at the TX, defined as an opportunistic probability (OP). The secondary TX randomly accesses the spectrum depending on OP. We optimize the SaP framework to maximize the area spectral efficiencies (ASEs) of secondary networks while guaranteeing the service quality of the primary networks. Testbed experiments using USRP and MATLAB simulations show that SaP affords higher ASEs compared with CR without prediction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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