NDLI: Pilot schemes for time-varying channel estimation in OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Zijian Tang Leus, G.
Copyright Year	2007
Description	Author affiliation: Delft Univ. of Technol., Delft (Zijian Tang; Leus, G.)
Abstract	We compare diverse frequency-domain multiplexed pilot arrangement schemes for time-varying channel estimation in an orthogonal frequency-division multiplexing (OFDM) system. In the first scheme, the comb-type, only a fraction of the subcarriers is dedicated to the pilots, but the pilots are carried by each OFDM symbol. In the second scheme, the block-type, the pilots occupy all subcarriers, but such pilot OFDM symbols are interleaved with data OFDM symbols. The third scheme, the mixed-type, is a combination of the two previous schemes. Pilot-aided channel estimators are applied, which take into account the channel variation within one OFDM symbol. The performance of the three pilot schemes is compared for different channel situations. We will show that the comb-type scheme can be opted for estimating short but fast channels, while the block-type scheme is promising for long but slow channels. The mixed-type scheme yields a good tradeoff between these two channel situations.
Starting Page	1
Ending Page	5
File Size	212281
Page Count	5
File Format	PDF
ISBN	9781424409549
DOI	10.1109/SPAWC.2007.4401307
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	Finland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time-varying channels OFDM Frequency division multiplexing Channel estimation Polynomials Statistics Discrete Fourier transforms Finite impulse response filter Frequency estimation Interference pilot-aided channel estimation time-varying channel
Content Type	Text
Resource Type	Article

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