A new approach for channel equalization without guard interval using polyphase matrices

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Klier, Juliane; Schuller, Gerald (Fraunhofer Institute for Digital Media Technology, Ehrenbergstrasse 29, 98693 Ilmenau, Germany)
Schuller, Gerald (Ilmenau University of Technology, Institute of Media Technology, PO Box 100565, 98684 Ilmenau, Germany)
Haardt, Martin; Hennhöfer, Marko (Ilmenau University of Technology, Communications Research Laboratory, PO Box 100565, 98684 Ilmenau, Germany)

In this contribution we propose a new way to state and solve the channel equalization problem for an OFDM (Orthogonal Frequency Division Multiplexing) system, without the use of a guard interval. Therefore, the spectral efficiency is increased. The approach is based on the channel representation as a polynomial matrix. We develop a new decomposition of this matrix, which diagonalizes the channel matrix independently of the channel realization. It leads to a simple inversion of the channel matrix. The decomposition consists of forward and inverse DFTs and polynomial diagonal matrices. Further on, there is no restriction on the length of the channel impulse response.