动态干扰门限的统计建模及其对网络容量的影响
Statistical Modelling of Dynamic Interference Threshold and Its Effect on Network Capacity
摘要：
在本文中，我们提出的情况下，利用干扰温度（IT）作为一个动态的量，而不是作为一个固定量的正交频分多址接入（OFDMA）为基础的频谱共享系统。这里的基本思想是在设置次级用户（SU）的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在放松的IT时段期间机会性地具有更高的发射功率，从而导致更高的网络容量。本文考虑的认知无线电网络（CRN）具有一种可扩展的网络结构，在该结构中，当SU在PU接收端的干扰功率低于一定的功率阈值时，SU可以同时接入PU的可用频谱。该功率阈值被设置为维持和保证PU网络的一定水平的服务质量（QoS）。推导了SU网络中断概率和平均容量的理论表达式，并通过仿真验证了其有效性。在认知无线电系统中，与采用固定IT相比，采用动态IT可以获得更高的网络性能增益。
英文摘要：
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.
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