Statistical Modelling of Dynamic Interference Threshold and Its Effect on Network Capacity
Statistical Modelling of Dynamic Interference Threshold and Its Effect on Network Capacity
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DOI：
10.1109/tvt.2020.2979047
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发表时间：
2020-05-01
影响因子：
6.8
通讯作者：
Imran, Ali
中科院分区：
文献类型：
--
作者：
Kachroo, Amit;Ekin, Sabit;Imran, Ali
在本文中，我们提出了在基于正交频分多址（OFDMA）的频谱共享系统中使用干扰温度（IT）作为一个动态量而不是一个固定量的情况。这里的基本思想是在设置辅助用户干扰功率阈值时反映主用户（PU）随时间变化的容量需求。这种类型的动态IT将允许SU在IT放松期间机会地拥有更高的传输功率，从而导致更高的网络容量。本文所考虑的认知无线电网络（CRN）具有一种底层网络结构，在这种网络结构中，只要来自SU的干扰功率低于一定的功率阈值，则PU的可用频谱由SU并发访问。设置该功率阈值是为了维护和保证PU网络有一定的QoS （quality of service）。推导了SU网络中断概率和平均容量的理论表达式，并用仿真结果进行了验证，并观察到在认知无线电系统中，与使用固定it相比，使用动态it可以获得更高的网络性能提升。
In this paper, we present the case of utilizing interference temperature (IT) as a dynamic quantity rather than as a fixed quantity in an orthogonal frequency division multiple access (OFDMA) based spectrum sharing systems. The fundamental idea here is to reflect the changing capacity demand of primary user (PU) over time in setting the interference power threshold for secondary user (SU). This type of dynamic IT will allow the SU to opportunistically have higher transmit power during relaxed IT period, thereby resulting in higher network capacity. The cognitive radio network (CRN) considered in this paper has an underlay network configuration in which the available spectrum of the PU is accessed concurrently by SU provided that the interference power at the PU receiver from SU is under a certain power threshold. This power threshold is set to maintain and guarantee a certain level of quality of service (QoS) for PU network. Theoretical expressions for outage probability and mean capacity for SU network are derived, and validated with simulation results, and it is observed that utilizing dynamic IT results in high network performance gains as compared to utilizing a fixed IT in cognitive radio system.