Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications

Research and Implementation of Downlink Simulation Platform Based on the LTE Protocol

Author LinFengSheng
Tutor ZhouJian
School Nanjing University of Posts and Telecommunications
Course Signal and Information Processing
Keywords LTE Physical layer Downlink Multiple Input Multiple Output Simulation Platform Channel estimation
CLC TN929.5
Type Master's thesis
Year 2012
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With the vigorous development of mobile communications , showing the trend of mobile , broadband and IP-based global wireless communications . In order to counter the challenges of WiMAX, Wi-Fi , mobile broadband wireless access technology market , and improve the competitiveness of 3G in emerging broadband wireless access market , 3GPP began a study of the long-term evolution of UMTS technology (Long Term Evolution, LTE) technology , to achieve 3G technology to B3G and 4G smooth transition . R8 LTE physical layer communication protocol based on the LTE downlink physical layer link level simulation platform based on MATLAB modeling , design , and performance evaluation and validation of the platform of the key technologies . The paper first introduces the technical background , the evolution of the LTE system objectives and system architecture ; elaborated the key technologies of the LTE downlink physical layer OFDMA , MIMO , HARQ principle; focus on three of the MIMO implementations : transmit diversity , spatial multiplexing , beam forming were analyzed. Secondly, analysis of the basic principle of the downlink based on the LTE communication protocols , studied and realized LTE physical layer downlink level simulation platform ; gives a system configuration diagram of the downlink simulation platform , the realization of the principle of the main module and design flowchart ; key technology MIMO LTE physical layer in the simulation platform simulation assessments and algorithm analysis ; combination of MIMO and OFDM technology is verified by simulation can greatly improve the communication capabilities of the wireless communication system in a frequency-selective channel . Finally , based on this platform , research -based pilot LTE Downlink channel estimation algorithm , a detailed analysis of the LS , MMSE pilot channel estimation algorithm and various interpolation algorithm . MMSE channel estimation autocorrelation matrix inverse operation characteristics of large , proposed an improved method based on LMMSE algorithms - approximately linear minimum mean square error ( Approximate the the Linear MMSE , ALMMSE ) , and combined with Matlab simulation its performance and practicality verification and analysis . The simulation results show that the simplified algorithm similar MMSE algorithm performance and reduce the computational complexity , is easy to implement .

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