Overview of Compressive Sensing Based Channel Estimation for OFDM Systems under Long Delay Channels
Volume: 4 - Issue: 02 - Date: 01-02-2015
Approved ISSN: 2278-1412
Published Id: IJAECESTU237 | Page No.: 421-425
Author: Shail Prakash Singh
Co- Author: Rashmi Pandey
Abstract:-OFDM is a signaling technique that has been applied widely in wireless
communication systems due to its ability to maintain effective transmission and highly efficient
bandwidth utilization in the presence of various channel impairments which one of them is
frequency selective fading. In OFDM systems the available spectrum are divided into many
orthogonal sub-channels, which are instantaneously used to data transmission. Also, in this
technique the inter-symbol interference (ISI) which is induced due to frequency selective channels
can be reduced by adding the cyclic prefix (CP) [1]. In OFDM systems, channel estimation is
necessary to obtain the channel state information (CSI), reducing the bit error rate and also to
achieve a distortion less output data. There are various methods to channel estimation such as: with or without a need to parametric models, blind or pilot based methods, frequency and/or time
domain analysis, adaptive or non adaptive techniques. Among these mentioned methods, channel
estimation in OFDM systems is often done in frequency domain using pilot symbols or training
data [2]. The least square and minimum mean-square error (MMSE) are conventional linear channel estimation techniques which are based on pilot arrangement
Key Words:-Signal processing method, precise estimation of Leq , roughly observed data
Area:-
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