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On the Channel Estimation and Realization Techniques for LTE Downlink System

Author: YangYong
Tutor: ChenQingChun
School: Southwest Jiaotong University
Course: Communication and Information System
Keywords: Channel estimation SNR estimation Linear interpolation LTE
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 154
Quote: 2
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Abstract


3G evolution technology as an important class of the LTE improvement of the 3GPP Long Term Evolution project and enhance the existing 3G air interface technology , in the spectrum of 20MHz to provide 100Mbps downlink and 50Mbps uplink peak rates . Channel estimation techniques , in order to support high-speed LTE broadband wireless transmission , time and frequency domain synchronization technology and reduce the peak-to-average power ratio technology has become the key technologies of LTE systems . The papers focus on the analysis and discussion of SNR estimation of technical solutions to meet the LTE standard downlink channel estimation is based on analysis of the downlink of the LTE standard , combined with channel estimation and signal-to-noise ratio estimation techniques Research . Papers based on the LTE standard protocol TS36.211-TS36.214, research and analysis of least squares (LS), minimum mean square error ( MMSE ) and the optimal linear mean square error (BLUE) the performance of the three channel estimation algorithm , combined comprehensive analysis and comparison with actual application requirements of the LTE downlink , the non - pilot positions of the channel interpolation estimation method , design based on LS pilot sub-carrier , the frequency domain using improved the DFT filter interpolation and time domain linear interpolation LTE downlink channel estimation technology program, which take advantage of the estimated channel information reasonably noise threshold is set according to the distribution of the signal and noise energy filtering window can be a reasonable choice better filter out the noise , to reduce noise estimation error , system simulation show that the scheme can achieve better estimation performance and low implementation complexity . SNR estimation techniques , analyzes and to study Boumard SNR estimated technical solutions , combined with the MMSE SNR estimation algorithm is proposed improved Boumard SNR estimation algorithm , one for the LTE standard in the LTE downlink the simulation results show that this method can effectively improve the signal-to-noise ratio estimation performance . Demand for engineering applications , the paper based the linear interpolation LS channel estimates and AWGN channel environment Boumard SNR estimation method DSP algorithm design and verification , discussion and analysis of resource consumption and estimation accuracy of the algorithm , the results show that , based the the linear interpolation LS channel estimation and AWGN channel environment Boumard SNR estimation method with low complexity , fewer system resources occupancy rate characteristics, to meet the application requirements of the actual system .

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