基于软件无线电的同步机制研究

软件无线电(Software Defined Radio, SDR)以其灵活性和通用性等优点，成为了当代移动通信的一大研究热点。然而主流的SDR原型平台仅实现了点对点通信，由于未能解决时钟同步问题，在多点间通信方面难以保证时序控制和多用户调度。为搭建基于SDR平台的多点通信场景，提出了一种基于软件的网同步实现机制，并采用回程时延(Round Trip Delay, RTD)算法获得软时钟同步，实验表明在微软软件无线电原型平台（Sora）上能获得误差为纳秒级精度的软时钟源，能够模拟TDMA接入方式下的多用户通信场景，验证了软时钟同步机制的正确性与稳健性。

Research on synchronization mechanism based on Software Radio

Software Defined Radio (SDR) has become a hotspot research of mobile communication because of its flexibility and versatility. However, the mainstream SDR prototype platform only realizes point-to-point communication. Because it fails to solve the problem of clock synchronization, it is difficult to ensure timing control and multi-user scheduling in the aspect of multi-point communication. In order to build a multi-point communication scenario based on SDR platform, a software network synchronization mechanism is proposed, and round-trip delay is used, RTD) algorithm obtains the soft clock synchronization. The experiments show that the soft clock source with nanosecond error can be obtained on the Microsoft software radio prototype platform (Sora), which can simulate the multi-user communication scenario under TDMA access mode. In conclusion, the experiments verify the correctness and stability of the soft clock synchronization mechanism.