Channel Estimation in Comb-Type Pilot Arrangements for OFDM Systems with Null Subcarriers

Jihyung KIM  Sangho NAM  Daesik HONG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.12   pp.3458-3462
Publication Date: 2006/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.12.3458
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
channel estimation,  time-domain ML estimation,  null subcarriers,  OFDM,  

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Summary: 
This letter analyzes the degradation effect of null subcarriers in orthogonal frequency domain multiplexing (OFDM) systems on the time-domain maximum likelihood (ML) estimation performance. The analysis is used as the basis for a proposal for a channel estimation method that can overcome performance degradation caused by null subcarriers. The accuracy of the proposed method is confirmed by the numerical analysis.