Estimation of time-varying channels - A block approach
bookPart
Channel state information (CSI) is indispensable for coherent detection in a wireless communication system. The pilot-aided method is one of the most intensively studied approaches for channel estimation. This method is especially attractive for time-varying channels because of their short coherence time. This chapter discusses pilot-aided channel estimation for time-varying channels, with focus on a block approach where the channel is modeled as a basis expansion model (BEM) within the block. Channel estimation has been studied for single-carrier as well as orthogonal frequency division multiplexing (OFDM) systems. The channel is always estimated in the time domain, but the pilot symbols are inserted in the time domain for single-carrier systems and in the frequency domain for OFDM systems. Different channel estimators have been studied and the number of observation samples taken into account for channel estimation has been optimized. The chapter looks at the case where a single block of data is considered, and subsequently extends the discussion to the case where multiple blocks of data are used. The latter leads to less restrictive channel identifiability conditions, and can allow for higher bandwidth efficiency. Furthermore, the chapter considers extensions to multiple antenna systems and briefly discussed adaptive channel estimation. © 2011 Elsevier Ltd. All rights reserved.
TNO Identifier
478750
Publisher
Elsevier Ltd
Source title
Wireless Communications Over Rapidly Time-Varying Channels
Editor(s)
Hlawatsch, F.
Matz, G.
Matz, G.
Place of publication
Boston : [etc]
Pages
155-197
Files
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