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首页> 外文期刊>Wireless Communications Letters, IEEE >Optimal Cognitive Radio Spectrum Access With Joint Spectrum Sensing and Power Allocation
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Optimal Cognitive Radio Spectrum Access With Joint Spectrum Sensing and Power Allocation

机译：具有联合频谱感知和功率分配的最佳认知无线电频谱接入

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摘要

Spectrum access policy in cognitive radio (CR) systems is classically based on a binary-valued function, where the secondary users (SUs) can access the spectrum of a primary user (PU) with the probabilities '0' or '1', according the measured energy. In this letter, following the concept of probabilistic spectrum access, which assigns a probability for CR signal transmission over the spectrum of a PU, we show that the optimal spectrum access approach belongs to the family of real-valued continuous functions where the probability of accessing or not accessing the spectrum by SUs is a real number between zero and one. Moreover, we show that the spectrum access probability is always greater than or equal to the tolerable miss detection probability. For comparison, we consider the well-known interweave (i.e., no transmission when PU is present) and underlay (i.e., always transmission even when PU is present) approaches where the spectrum access probability is either equal to '0' or '1'. Numerical results confirm that the proposed spectrum access outperforms the interweave and underlay schemes in terms of the achievable CR data rate.
机译：认知无线电（CR）系统中的频谱访问策略通常基于二进制值函数，根据该函数，辅助用户（SU）可以访问概率为'0'或'1'的主要用户（PU）的频谱。测得的能量。在这封信中，遵循概率频谱访问的概念（为PU频谱上的CR信号传输分配了概率），我们证明了最佳频谱访问方法属于实值连续函数族，其中访问概率或者SU不访问频谱是介于0和1之间的实数。此外，我们表明频谱访问概率始终大于或等于可容忍的未命中检测概率。为了进行比较，我们考虑了众所周知的交织（即，当存在PU时没有传输）和底层（即即使有PU时也始终传输）接近频谱访问概率等于“ 0”或“ 1”的情况。数值结果证实，就可实现的CR数据速率而言，拟议的频谱访问性能优于交织和底层方案。

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