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arXiv 0903.0099cs.ITmath.IT
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干扰信道下认知无线电频谱效率优化的自适应传输

Spectral Efficiency Optimized Adaptive Transmission for Cognitive Radios in an Interference Channel

Mehrdad Taki, Farshad Lahouti

摘要:

在本文中,我们考虑了一个主用户和一个认知用户在无线衰落干扰信道上的传输。主用户以恒定功率发射,并利用满足比特出错率要求的自适应调制和编码(AMC)方案。我们提出了一种链路自适应方案,以最大限度地提高认知无线电的平均频谱效率,而主用户所需的最低频谱效率被规定。所得到的问题被约束为还满足比特出错率要求和认知链路的功率约束。认知发射机的AMC模式选择和功率控制基于两个链路的缩放的信号与噪声加干扰比反馈来优化。然后,该问题被投射为一个非线性离散优化问题,提出了一个快速有效的次优解。我们还提出了一个方案与速率自适应和一个恒定的功率。所提出的方案的一个重要特点是,用户之间不需要协商。与自适应传输的认知无线电的交织和交织方法的比较证明了所提出的解决方案的效率。

英文摘要:

In this paper, we consider a primary and a cognitive user transmitting over a wireless fading interference channel. The primary user transmits with a constant power and utilizes an adaptive modulation and coding (AMC) scheme satisfying a bit error rate requirement. We propose a link adaptation scheme to maximize the average spectral efficiency of the cognitive radio, while a minimum required spectral efficiency for the primary user is provisioned. The resulting problem is constrained to also satisfy a bit error rate requirement and a power constraint for the cognitive link. The AMC mode selection and power control at the cognitive transmitter is optimized based on the scaled signal to noise plus interference ratio feedback of both links. The problem is then cast as a nonlinear discrete optimization problem for which a fast and efficient suboptimum solution is presented. We also present a scheme with rate adaption and a constant power. An important characteristic of the proposed schemes is that no negotiation between the users is required. Comparisons with underlay and interweave approaches to cognitive radio with adaptive transmission demonstrate the efficiency of the proposed solutions.

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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