LTE联合仿真平台下多用户多小区链路设计及GFDM系统共存测试分析
发布时间：2018-12-13 03:16
【摘要】：随着5G技术标准的推进,建立一个4G与5G通信系统兼容的系统仿真平台对下一代通信技术发展至关重要。传统的系统级仿真中采用链路级到系统级映射方案来提供链路信息,在链路级仿真映射过程中,由于新场景的复杂化,导致映射精度的损失,从而使系统仿真缺失真实性。而纯软件链路仿真需要较长仿真周期,无法满足系统级仿真的实时调度要求。针对这些问题,本文采用软硬件联合仿真,利用软件无线电设备通用软件无线电外设(Universal Software Radio Peripheral,USRP)实现链路基带到射频流程。用硬件链路代替软件链路仿真,系统级仿真提供系统信息参数,硬件链路实时反馈实测信道质量指标,达到系统级和链路级联合仿真,以消除链路级仿真映射过程中映射性能损失和链路仿真的时效性问题。借助USRP灵活的重构性,不仅可以实现LTE链路流程而且可用于5G物理层新技术验证。本文的主要工作是对联合仿真平台下硬件链路进行设计、搭建GFDM系统共存测试链路并进行测试验证,具体工作包括:第一,搭建软硬件联合仿真平台,在该仿真平台下基于USRP-RIO(Reconfigurable Input/Output)设备和 LabVIEW Communications 软件设计针对系统仿真需求的长期演进技术(Long Term Evolution,LTE)多用户多小区硬件链路。多用户多小区表示存在用户间干扰和小区间干扰,对用户间干扰设计九个干扰用户的干扰受控链路,小区间干扰设计六个相邻小区对目标小区用户的受控干扰。对所设计链路进行性能测试,验证该链路可满足联合仿真的需求。将链路融入到联合仿真平台中进行性能测试,验证该链路可提升仿真映射精度并解决仿真时效性问题。第二,考虑到联合仿真平台的后向兼容性,搭建5G新技术验证链路广义频分复用(Generalized Frequency Division Multiplexing,GFDM)系统共存仿真链路,为该平台的GFDM系统共存测试链路做好理论准备。首先从GFDM的收发链路、发射机和接收机模型入手,着重分析GFDM与LTE下行链路中正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)的区别,突出 GFDM 的低带外功率适合于系统共存的特点。接着进行仿真得出了保护间隔、滤波器类型、滚降系数对系统共存的性能影响。第三,根据仿真链路原理搭建基于USRP-RIO的GFDM和LTE系统共存测试链路。通过该测试平台测试了 GFDM/OFDM发射功率对LTE性能影响、GFDM滤波器系数对LTE性能影响、GFDM/OFDM与LTE系统的资源块(Resource Block,RB)分配对LTE性能影响。测试结果验证了 GFDM更适合于LTE兼容的共存系统中。通过以上几个方面的工作,在软硬件联合仿真平台下实现了多用户多小区链路和GFDM系统共存测试链路,并通过测试验证,分析了各链路的性能。
[Abstract]:With the development of 5G technology standard, it is very important to establish a 4G system simulation platform compatible with 5G communication system for the development of next generation communication technology. In the traditional system level simulation, link level to system level mapping scheme is used to provide link information. In the course of link level simulation mapping, the complexity of the new scene leads to the loss of mapping accuracy, which leads to the lack of authenticity in the system simulation. The pure software link simulation needs a long simulation period, which can not meet the real-time scheduling requirements of system level simulation. To solve these problems, this paper uses software and hardware joint simulation, software radio equipment general software radio peripheral (Universal Software Radio Peripheral,USRP) to realize link baseband to radio frequency flow. Using hardware link instead of software link simulation, system level simulation provides system information parameters, hardware link real-time feedback measured channel quality index, system level and link level joint simulation. In order to eliminate the mapping performance loss and the timeliness of link simulation during link level simulation mapping. With the flexible reconfiguration of USRP, not only can the LTE link flow be realized, but also it can be used to verify the new 5G physical layer technology. The main work of this paper is to design the hardware link under the joint simulation platform, build the GFDM system coexistence test link and test verification, the specific work includes: first, build the hardware / software joint simulation platform. Based on USRP-RIO (Reconfigurable Input/Output) equipment and LabVIEW Communications software, the multi-user and multi-cell hardware link is designed based on the simulation platform based on the long-term evolution technology (Long Term Evolution,LTE. Multi-user multi-cell indicates that there exists inter-user interference and inter-cell interference. Nine interference controlled links are designed for inter-user interference and six adjacent cells are designed for controlled interference to target cell users. The performance of the designed link is tested to verify that the link can meet the requirements of joint simulation. The link is integrated into the joint simulation platform for performance testing to verify that the link can improve the accuracy of simulation mapping and solve the problem of simulation timeliness. Secondly, considering the backward compatibility of the joint simulation platform, a 5G new technology is built to verify the coexistence simulation link of the link generalized frequency division multiplexing (Generalized Frequency Division Multiplexing,GFDM) system, which makes a theoretical preparation for the co-existence test link of the GFDM system of the platform. Starting with the transceiver, transmitter and receiver models of GFDM, the differences between GFDM and LTE Downlink orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing,OFDM) are analyzed, highlighting the characteristic that the low out-of-band power of GFDM is suitable for the coexistence of the system. Then, the effects of protection interval, filter type and roll-down coefficient on the coexistence performance of the system are obtained by simulation. Thirdly, the test link of GFDM and LTE system based on USRP-RIO is built according to the simulation link principle. The influence of GFDM/OFDM transmit power on LTE performance, GFDM filter coefficient on LTE performance and Resource Block,RB allocation of GFDM/OFDM and LTE system on LTE performance were tested. The test results show that GFDM is more suitable for LTE compatible coexistence systems. Through the above work, the multi-user multi-cell link and the GFDM system coexisting test link are realized under the software and hardware joint simulation platform. The performance of each link is analyzed through the test verification.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
本文编号：2375773
[Abstract]:With the development of 5G technology standard, it is very important to establish a 4G system simulation platform compatible with 5G communication system for the development of next generation communication technology. In the traditional system level simulation, link level to system level mapping scheme is used to provide link information. In the course of link level simulation mapping, the complexity of the new scene leads to the loss of mapping accuracy, which leads to the lack of authenticity in the system simulation. The pure software link simulation needs a long simulation period, which can not meet the real-time scheduling requirements of system level simulation. To solve these problems, this paper uses software and hardware joint simulation, software radio equipment general software radio peripheral (Universal Software Radio Peripheral,USRP) to realize link baseband to radio frequency flow. Using hardware link instead of software link simulation, system level simulation provides system information parameters, hardware link real-time feedback measured channel quality index, system level and link level joint simulation. In order to eliminate the mapping performance loss and the timeliness of link simulation during link level simulation mapping. With the flexible reconfiguration of USRP, not only can the LTE link flow be realized, but also it can be used to verify the new 5G physical layer technology. The main work of this paper is to design the hardware link under the joint simulation platform, build the GFDM system coexistence test link and test verification, the specific work includes: first, build the hardware / software joint simulation platform. Based on USRP-RIO (Reconfigurable Input/Output) equipment and LabVIEW Communications software, the multi-user and multi-cell hardware link is designed based on the simulation platform based on the long-term evolution technology (Long Term Evolution,LTE. Multi-user multi-cell indicates that there exists inter-user interference and inter-cell interference. Nine interference controlled links are designed for inter-user interference and six adjacent cells are designed for controlled interference to target cell users. The performance of the designed link is tested to verify that the link can meet the requirements of joint simulation. The link is integrated into the joint simulation platform for performance testing to verify that the link can improve the accuracy of simulation mapping and solve the problem of simulation timeliness. Secondly, considering the backward compatibility of the joint simulation platform, a 5G new technology is built to verify the coexistence simulation link of the link generalized frequency division multiplexing (Generalized Frequency Division Multiplexing,GFDM) system, which makes a theoretical preparation for the co-existence test link of the GFDM system of the platform. Starting with the transceiver, transmitter and receiver models of GFDM, the differences between GFDM and LTE Downlink orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing,OFDM) are analyzed, highlighting the characteristic that the low out-of-band power of GFDM is suitable for the coexistence of the system. Then, the effects of protection interval, filter type and roll-down coefficient on the coexistence performance of the system are obtained by simulation. Thirdly, the test link of GFDM and LTE system based on USRP-RIO is built according to the simulation link principle. The influence of GFDM/OFDM transmit power on LTE performance, GFDM filter coefficient on LTE performance and Resource Block,RB allocation of GFDM/OFDM and LTE system on LTE performance were tested. The test results show that GFDM is more suitable for LTE compatible coexistence systems. Through the above work, the multi-user multi-cell link and the GFDM system coexisting test link are realized under the software and hardware joint simulation platform. The performance of each link is analyzed through the test verification.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
【参考文献】
相关期刊论文 前4条
1 王海玉;侯嘉;;电力线通信系统中广义频分复用技术频域调制的应用与性能分析[J];科学技术与工程;2016年27期
2 孙尚勇;邵凯;秦梦瑶;翁海涛;;广义频分复用与正交频分复用的比较[J];电子技术应用;2015年11期
3 吴彤;张玉艳;赵慧;席雨;;基于开源SDR实现LTE系统对比[J];电信工程技术与标准化;2015年07期
4 蒙玎;张祖凡;温林海;;LTE-advanced系统级仿真方法与实现[J];重庆邮电大学学报(自然科学版);2011年06期
，本文编号：2375773
本文链接：https://www.wllwen.com/kejilunwen/xinxigongchenglunwen/2375773.html
