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Channel Estimation for LTE Downlink using Various Techniques under the Effect of Channel Length

Author(s):

Darji Maulik Jayantilal , Sankalchand Patel College of Engineering, Visnagar; Prof. Vanrajsinh B. Vaghela, Sankalchand Patel College of Engineering, Visnagar

Keywords:

LTE, Pilot based Channel Estimation, Least square, Linear Minimum Mean Square Error, Inter Symbol Interference ,Inter carrier Interference and Orthogonal Frequency Division Multiple Access.

Abstract

The main purpose this paper is to study the performance of two linear channel estimators for LTE Downlink systems, the Least Square Error (LSE) and the Linear Minimum Mean Square Error (LMMSE) using QPSK and 16 QAM modulation technique and also studied the effect of channel length on the performance of channel estimation. As LTE Downlink system is a MIMO-OFDMA based system, a cyclic prefix (CP) is inserted at the beginning of each transmitted OFDM symbol in order to mitigate both inter- carrier interference (ICI) and inter-symbol interference (ISI). The inserted CP is usually equal to or longer than the channel length. However, the cyclic prefix can be shorter because of some unforeseen channel behavior. In the case where the cyclic prefix is equal to or longer than the channel length, LMMSE performs better than LSE but at the cost of computational complexity .In the other case, LMMSE performs also better than LS only for low SNR values. However, LS shows better performance for LTE Downlink systems for high SNR values. MATLAB simulations are used to evaluate the performance of the proposed estimator in terms of Bit Error Rate (BER) for 2x2 LTE Downlink systems.

Other Details

Paper ID: IJSRDV2I3066
Published in: Volume : 2, Issue : 3
Publication Date: 01/06/2014
Page(s): 182-186

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