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Type: Artigo de periódico
Title: The Extended-window Channel Estimator For Iterative Channel-and-symbol Estimation
Author: Lopes R.R.
Barry J.R.
Abstract: The application of the expectation-maximization (EM) algorithm to channel estimation results in a well-known iterative channel-and-symbol estimator (ICSE). The EM-ICSE iterates between a symbol estimator based on the forward-backward recursion (BCJR equalizer) and a channel estimator, and may provide approximate maximum-likelihood blind or semiblind channel estimates. Nevertheless, the EM-ICSE has high complexity, and it is prone to misconvergence. In this paper, we propose the extended-window (EW) estimator, a novel channel estimator for ICSE that can be used with any soft-output symbol estimator. Therefore, the symbol estimator may be chosen according to performance or complexity specifications. We show that the EW-ICSE, an ICSE that uses the EW estimator and the BCJR equalizer, is less complex and less susceptible to misconvergence than the EM-ICSE. Simulation results reveal that the EW-ICSE may converge faster than the EM-ICSE. © 2005 Hindawi Publishing Corporation.
Citation: Eurasip Journal On Wireless Communications And Networking. , v. 2005, n. 2, p. 92 - 99, 2005.
Rights: aberto
Identifier DOI: 10.1155/WCN.2005.92
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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