A Survey on Channel Estimation Techniques in OFDM System
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2014, Vol 3, Issue 8
Abstract
Orthogonal Frequency Division Multiplexing (OFDM) breaks the carrier in to sub carriers which are orthogonal to one- another, and hence called as orthogonal frequency division multiplexing. It is an extension of conventional frequency division multiplexing (FDM). The channel estimation techniques allow the receiver to approximate the behaviour of channel. In this paper various Channel Estimation Techniques of OFDM have been discussed. The channel estimation based on comb type pilot arrangement is studied through different algorithms for both estimating channel at pilot frequencies and interpolating the channel. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Furthermore, the channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. Further a brief introduction to blind and semi blind channel estimation is done.
Authors and Affiliations
Divya Pandey, Neelam Dewangan
Keywords
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