Sensing Based Joint Rate and Power Allocations for Cognitive Radio Systems

Sensing Based Joint Rate and Power Allocations for Cognitive Radio Systems
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认知无线电系统中基于感知的联合速率和功率分配

DOI:
10.1109/wcl.2012.022012.120009
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发表时间:
2012-02
影响因子:
6.3
通讯作者:
Limin Meng
Limin Meng
中科院分区:
计算机科学2区
文献类型:
--
作者:
Yuan Wu;Danny H.K. Tsang;钱丽萍;Limin Meng

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本文提出了一种基于频谱感知的认知无线电(CR)系统联合速率和功率分配方案。通过利用其感知结果和感知精度,次用户(SU)自适应地确定其传输策略,以最大化其有效吞吐量,这是可实现的,而不需要任何主用户(PU)的真实状态信息,因此比[1]使用的遍历容量的性能度量更实用。我们提出了一个有效的算法,找到最佳的SU率和功率分配策略,利用特殊的结构的问题。基于最优策略,我们进一步量化了充分条件,在该充分条件下,即使SU感测结果表明PU通过预期感测错误的发生而处于忙碌状态(但仍然满足PU干扰约束),SU也可以使用PU信道。我们的研究结果验证了在重叠二次频谱接入中同时利用感知结果和感知精度信息的优势。
In this paper, we propose a spectrum sensing based joint rate and power allocation scheme for Cognitive Radio (CR) systems. By exploiting both its sensing result and sensing accuracy, the Secondary User (SU) adaptively determines its transmission policy to maximize its effective throughput which is achievable without requiring any Primary User's (PU's) true state information and thus is more practical than the performance metric of ergodic capacity used by [1]. We propose an efficient algorithm to find the optimal SU rate and power allocation policy by exploiting the special structure of the problem. Based on the optimal policy, we further quantify sufficient conditions under which it is beneficial for the SU to use the PU channel even the SU sensing result indicates that the PU is busy by anticipating the happening of sensing error (but still with the PU interference constraint satisfied). Our results validate the advantages of exploiting both the information on sensing result and sensing accuracy in the overlay secondary spectrum access.
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