arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.03841cs.NI
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认知无线电网络中能量有效的跨层时间同步

Energy Efficient Cross Layer Time Synchronization in Cognitive Radio Networks

S. M. Usman Hashmi, Muntazir Hussain, S. M. Nashit Arshad, Kashif Inayat, Seong Oun Hwang

摘要:

时间同步是任何认知无线电网络(CRN)执行动态频谱管理的重要问题。每个认知无线电(CR)节点必须是环境感知的和自适应的,并且必须具有在多种调制方案和频率之间切换的能力。在这些CR节点内实现相同的时间概念对于满足用于频谱感测的同时静默期的要求是必不可少的。当前的应用层时间同步协议需要多个时间戳交换来估计CRN节点之间的时钟偏差。所提出的符号定时恢复方法已经在物理层估计硬件时钟的偏斜,并将其用于每个节点的应用层时钟的偏斜校正。应用层时钟的核心是硬件时钟,因此应用层时钟偏斜将与物理层的时钟偏斜相同,并且可以从符号定时恢复过程中校正。因此,一个时间戳足以同步两个CRN节点。这节省了应用层协议所使用的能量,使得CRN能量高效,并且可以在短时间内实现时间同步。

英文摘要:

Time synchronization is a vital concern for any Cognitive Radio Network (CRN) to perform dynamic spectrum management. Each Cognitive Radio (CR) node has to be environment aware and self adaptive and must have the ability to switch between multiple modulation schemes and frequencies. Achieving same notion of time within these CR nodes is essential to fulfill the requirements for simultaneous quiet periods for spectrum sensing. Current application layer time synchronization protocols require multiple timestamp exchanges to estimate skew between the clocks of CRN nodes. The proposed symbol timing recovery method already estimates the skew of hardware clock at the physical layer and use it for skew correction of application layer clock of each node. The heart of application layer clock is the hardware clock and hence application layer clock skew will be same as of physical layer and can be corrected from symbol timing recovery process. So one timestamp is enough to synchronize two CRN nodes. This conserves the energy utilized by application layer protocol and makes a CRN energy efficient and can achieve time synchronization in short span.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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