Multiband time-of-arrival positioning technique using an ultra-high-frequency bandwidth availability model for cognitive radio
Multiband time-of-arrival positioning technique using an ultra-high-frequency bandwidth availability model for cognitive radio
复制标题
使用认知无线电超高频带宽可用性模型的多频段到达时间定位技术
DOI：
10.1049/iet-rsn.2012.0100
复制
发表时间：
2013
影响因子：
1.7
通讯作者：
R. Knopp
中科院分区：
文献类型：
--
作者：
R. Thomas;B. T. Maharaj;B. Zayen;R. Knopp
在这项研究中，作者提出了一个多波段的到达时间（TOA）定位模型，并验证了在一个实际的动态频谱接入方案的性能，根据从超高频（UHF）频谱占用测量活动获得的结果。测量数据的统计分析表明，UHF频段的未占用和占用部分之间存在明显差异。根据测量结果，UHF频段的带宽可用性遵循高斯分布。利用非线性最小二乘、线性最小二乘和两步最大似然定位算法对定位模型进行了验证。该模型的均方根误差（RMSE）的性能评估显示，利用5个离散频带进行TOA估计的优势，特别是在差的信号噪声比（SNR）的条件下，范围从-10到0 dB。在一个固定的SNR为0 dB，一个平均RMSE改善74%和82%，观察到一个双频带和三频带系统相比，一个传统的单频带TOA系统。这种特定的定位技术可以实现动态频谱接入环境中的改进的位置估计。
In this study, the authors present a multiband time-of-arrival (TOA) positioning model and validate the performance in a practical dynamic spectrum access scenario according to results obtained from an ultra-high-frequency (UHF) spectrum occupancy measurement campaign. The statistical analysis of the measured data shows a distinguishable difference between the unoccupied and occupied portion of the UHF band. The bandwidth availability for the UHF band is shown to follow a Gaussian distribution according to the measurement results. The positioning model is verified using the non-linear least squares, linear least squares and two-step maximum-likelihood location estimation algorithms. The root-mean-square error (RMSE) performance evaluation of the proposed model revealed the advantage of utilising five discrete bands to perform TOA estimation, especially in poor signal-to-noise ratio (SNR) conditions ranging from – 10 to 0 dB. At a fixed SNR of 0 dB, an average RMSE improvement of 74 and 82% was observed for a double- and triple-band system when compared with a conventional single-band TOA system. This particular positioning technique can enable improved location estimation in a dynamic spectrum access environment.