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首页> 外文期刊>Wireless Communications Letters, IEEE >On the Interference Tolerance of the Primary System in Cognitive Radio Networks
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On the Interference Tolerance of the Primary System in Cognitive Radio Networks

机译：认知无线电网络中主系统的干扰容忍度

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摘要

In this letter, we consider underlay spectrum access in a cognitive radio network, where two coexisting cellular systems, i.e., primary and cognitive, share the same frequency band. The throughput performance of this system is directly linked to the tolerated interference level at the primary receiver. We investigate the fundamental trade-off between the interference tolerance in the primary system and the achievable throughput of the cognitive network. We formulate the network performance as a multi-objective optimization problem with a set of objectives including minimizing the interference imposed on each primary user, and maximizing the intended signal received at every secondary user. We then derive an equivalent standard semi-definite programming form and prove that the derived problem always yields rank-one solutions. The obtained solution set provides the best achievable throughput (characterized by the maximum intended signal power at each cognitive user) for a given level of interference tolerance in the primary system. It also gives the achievable gain on the system throughput if the primary system is able to compromise and increase its interference tolerance, such framework could be a base for negotiations between the operators. An improvement of 0.38 bits/s/channel-use is observed on the achievable throughput for 1 dB higher interference tolerance at the primary receivers.
机译：在这封信中，我们考虑了认知无线电网络中的频谱接入，其中两个共存的蜂窝系统（即主系统和认知系统）共享相同的频带。该系统的吞吐性能直接与主接收机的容许干扰水平相关。我们研究了基本系统的干扰容忍度与可实现的认知网络吞吐量之间的基本权衡。我们将网络性能公式化为具有多个目标的多目标优化问题，其中包括最小化施加于每个主要用户的干扰以及最大化每个次要用户接收的预期信号。然后，我们导出等效的标准半定规划形式，并证明导出的问题始终会产生秩一解。对于主系统中给定的干扰容忍水平，所获得的解决方案集可提供最佳的吞吐量（以每个认知用户的最大预期信号功率为特征）。如果主系统能够妥协并增加其干扰容忍度，那么它也可以在系统吞吐量上获得可实现的收益，这样的框架可以成为运营商之间进行谈判的基础。在主要接收器处，由于1 dB的较高干扰容限，可达到的吞吐量提高了0.38位/秒/信道使用率。

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