A Study of Channel Estimation in OFDM Systems

A Study of Channel Estimation in OFDM Systems. Sinem Coleri, Mustafa Ergen,Anuj Puri, Ahmad Bahai. Abstract The channel estimation techniques for OFDM system

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Abstract, tems based on pilot arrangement are investigated. 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. We have also implemented decision feedback, equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by mea-, suring bit error rate with 16QAM, QPSK and DQPSK as modulation schemes, and multi-path Rayleigh fading and AR based, fading channels as channel models.

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