Blind channel estimation for precoded OFDM system

Author

Zhang, Ruifeng

Author_Institution

Dept. of Electr. & Comput. Eng., Drexel Univ., Philadelphia, PA, USA

Volume

3

fYear

2005

fDate

18-23 March 2005

Abstract

An orthogonal frequency division multiplex (OFDM) system with block-precoding is studied. It is observed that the correlation matrix of the post-DFT data is equal to the direct-product of the channel vector multiplied, element-by-element, by the product of the precoding matrix and its Hermitian. Therefore, an element-by-element division of the post-DFT correlation matrix by the product of the precoding matrix and its Hermitian gives a rank-one matrix whose only singular vector coincides the channel vector up to a phase ambiguity. The design criteria of the precoding matrix are discussed.

Keywords

Hermitian matrices; OFDM modulation; channel estimation; correlation methods; discrete Fourier transforms; fading channels; matrix multiplication; Hermitian matrix; blind channel estimation; block-precoding; channel vector; correlation matrix; frequency-selective fading channels; orthogonal frequency division multiplexing system; phase ambiguity; post-DFT data; precoded OFDM system; precoding matrix; rank-one matrix; Binary phase shift keying; Blind equalizers; Channel estimation; Data communication; Frequency division multiplexing; Frequency estimation; Frequency-selective fading channels; Interference; OFDM modulation; Quadrature amplitude modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP '05). IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-8874-7

Type

conf

DOI

10.1109/ICASSP.2005.1415748

Filename

1415748