Link adaptation design for interfering cognitive radio with QoS constraints

M. Taki, F. Lahouti
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引用次数: 4

Abstract

In this paper, we consider a primary and a cognitive user transmitting over a wireless fading interference channel. Both primary and cognitive links are subject to delay-QoS constraints. The achievable throughput subject to a given delay-QoS constraint can be quantified as the effective capacity of a link. We consider a system in which the primary user transmits with a constant power and utilizes an adaptive modulation and coding (AMC) scheme subject to its required bit error rate (BER). A link (power and rate) adaptation scheme is proposed for the interfering cognitive radio to maximize its effective capacity, while a minimum required effective capacity for the primary user is provisioned. A BER performance requirement and a power constraint are also considered for the cognitive radio. The resulting problem is then cast as a nonlinear discrete optimization problem for which a fast and efficient suboptimum solution is presented. Comparisons with the scheduled (non-interfering) adaptive cognitive transmission demonstrate the efficiency of the proposed interfering transmission scheme.
具有QoS约束的干扰认知无线电链路自适应设计
在本文中,我们考虑在无线衰落干扰信道上传输的主要用户和认知用户。主链路和认知链路都受到延迟- qos约束。在给定延迟- qos约束下的可实现吞吐量可以量化为链路的有效容量。我们考虑了一个系统,其中主用户以恒定功率传输,并根据其所需的误码率(BER)使用自适应调制和编码(AMC)方案。提出了一种链路(功率和速率)自适应干扰认知无线电方案,使其有效容量最大化,同时规定了主用户所需的最小有效容量。同时考虑了误码率性能要求和功率约束。然后将结果问题转化为非线性离散优化问题,并给出快速有效的次优解。通过与非干扰自适应认知传输的比较,验证了干扰传输方案的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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