LTE聯(lián)合仿真平臺下多用戶多小區(qū)鏈路設計及GFDM系統(tǒng)共存測試分析
發(fā)布時間：2018-12-13 03:16
【摘要】：隨著5G技術標準的推進,建立一個4G與5G通信系統(tǒng)兼容的系統(tǒng)仿真平臺對下一代通信技術發(fā)展至關重要。傳統(tǒng)的系統(tǒng)級仿真中采用鏈路級到系統(tǒng)級映射方案來提供鏈路信息,在鏈路級仿真映射過程中,由于新場景的復雜化,導致映射精度的損失,從而使系統(tǒng)仿真缺失真實性。而純軟件鏈路仿真需要較長仿真周期,無法滿足系統(tǒng)級仿真的實時調(diào)度要求。針對這些問題,本文采用軟硬件聯(lián)合仿真,利用軟件無線電設備通用軟件無線電外設(Universal Software Radio Peripheral,USRP)實現(xiàn)鏈路基帶到射頻流程。用硬件鏈路代替軟件鏈路仿真,系統(tǒng)級仿真提供系統(tǒng)信息參數(shù),硬件鏈路實時反饋實測信道質(zhì)量指標,達到系統(tǒng)級和鏈路級聯(lián)合仿真,以消除鏈路級仿真映射過程中映射性能損失和鏈路仿真的時效性問題。借助USRP靈活的重構性,不僅可以實現(xiàn)LTE鏈路流程而且可用于5G物理層新技術驗證。本文的主要工作是對聯(lián)合仿真平臺下硬件鏈路進行設計、搭建GFDM系統(tǒng)共存測試鏈路并進行測試驗證,具體工作包括:第一,搭建軟硬件聯(lián)合仿真平臺,在該仿真平臺下基于USRP-RIO(Reconfigurable Input/Output)設備和 LabVIEW Communications 軟件設計針對系統(tǒng)仿真需求的長期演進技術(Long Term Evolution,LTE)多用戶多小區(qū)硬件鏈路。多用戶多小區(qū)表示存在用戶間干擾和小區(qū)間干擾,對用戶間干擾設計九個干擾用戶的干擾受控鏈路,小區(qū)間干擾設計六個相鄰小區(qū)對目標小區(qū)用戶的受控干擾。對所設計鏈路進行性能測試,驗證該鏈路可滿足聯(lián)合仿真的需求。將鏈路融入到聯(lián)合仿真平臺中進行性能測試,驗證該鏈路可提升仿真映射精度并解決仿真時效性問題。第二,考慮到聯(lián)合仿真平臺的后向兼容性,搭建5G新技術驗證鏈路廣義頻分復用(Generalized Frequency Division Multiplexing,GFDM)系統(tǒng)共存仿真鏈路,為該平臺的GFDM系統(tǒng)共存測試鏈路做好理論準備。首先從GFDM的收發(fā)鏈路、發(fā)射機和接收機模型入手,著重分析GFDM與LTE下行鏈路中正交頻分復用(Orthogonal Frequency Division Multiplexing,OFDM)的區(qū)別,突出 GFDM 的低帶外功率適合于系統(tǒng)共存的特點。接著進行仿真得出了保護間隔、濾波器類型、滾降系數(shù)對系統(tǒng)共存的性能影響。第三,根據(jù)仿真鏈路原理搭建基于USRP-RIO的GFDM和LTE系統(tǒng)共存測試鏈路。通過該測試平臺測試了 GFDM/OFDM發(fā)射功率對LTE性能影響、GFDM濾波器系數(shù)對LTE性能影響、GFDM/OFDM與LTE系統(tǒng)的資源塊(Resource Block,RB)分配對LTE性能影響。測試結果驗證了 GFDM更適合于LTE兼容的共存系統(tǒng)中。通過以上幾個方面的工作,在軟硬件聯(lián)合仿真平臺下實現(xiàn)了多用戶多小區(qū)鏈路和GFDM系統(tǒng)共存測試鏈路,并通過測試驗證,分析了各鏈路的性能。
[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.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5
本文編號：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.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5
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