基于通用计算机和USRP的LTE通信系统开发与实现

Development and Implementation of LTE Communication System Based on Universal Computers and USRP

摘要:

为了解决软件仿真不能进行真实信道环境下的性能演示、不能测量真实通信系统的传输速率与时延等方面的弊端,研究了基于通用计算机和通用软件无线电外设USRP的LTE通信系统的实现方法。对系统的基本结构与原理进行了分析。采用通用计算机与软件无线电前端相结合的方式,由通用计算机完成基带处理功能,由USRP完成基带信号的射频收发,并采用开放空中接口OAI平台作为软件架构实现数据处理与系统控制。在5MHz系统带宽配置场景下,对所研究的LTE系统进行了软、硬件调试、测试与验证,实现了完整的LTE通信系统的功能。此外,进一步开发和实现了支持包括电脑终端和商用终端在内的多用户接入场景。测试结果表明所搭建的LTE通信系统能够与公共互联网实现互联互通,并维持较为稳定的连接。

Abstract:

In order to solve the problems that software simulation cannot demonstrate the performance in real channel environment, and cannot measure the transmission rate and delay of real communication system, the implementation method of LTE communication system based on universal computer and universal software radio peripheral (USRP) is studied. The basic structure and principle of the system are analyzed. By combining general computer with the front end of software radio, the baseband processing functions are fulfilled by universal computers, while the transmission and receiving of radio signals are fulfilled by USRP, in addition, the open air interface (OAI) platform is used as software structure to realize data processing and system control. The software and hardware of the considered LTE system are configured, tested and verified in the scenario of 5MHz system bandwidth, where all functions of LTE communication system are realized. In addition, the multi-user access scenario including computer terminals and commercial terminals is further developed and realized. The test results show that the LTE communication system can fulfill interconnection with public Internet and maintain stable connection.