Blind Channel Estimation for SIMO-OFDM Systems without Cyclic Prefix

Shih-Hao FANG  Ju-Ya CHEN  Ming-Der SHIEH  Jing-Shiun LIN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A   No.1   pp.339-343
Publication Date: 2010/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.339
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Communication Theory and Signals
blind channel estimation,  OFDM,  subspace-based method,  

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A blind channel estimation algorithm based on the subspace method for single-input multiple-output (SIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed in this letter. With the aid of a repetition index, the conventional algorithm is a special case of our algorithm. Compared with related studies, the proposed algorithm reduces the computational complexity of the SVD operation and is suitable for cyclic-prefix-free systems. In particular, the necessary condition of the proposed signal matrix to be full rank can be satisfied with fewer OFDM blocks. Simulation results demonstrate that the proposed algorithm outperforms conventional methods in normalized mean-square error.