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Optimal training and redundant precoding for block transmissions with application to wireless OFDM

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2 Author(s)
Ohno, S. ; Dept. of Electr. & Comput. Eng., Hiroshima Univ., Japan ; Giannakis, G.B.

The adoption of orthogonal frequency-division multiplexing by wireless local area networks and audio/video broadcasting standards testifies to the importance of recovering block precoded transmissions propagating through frequency-selective finite-impulse response (FIR) channels. Existing block transmission standards invoke bandwidth-consuming error control codes to mitigate channel fades, and training sequences to identify the FIR channels. To enable block-by-block receiver processing, we design redundant precoders with cyclic prefix and superimposed training sequences for optimal channel estimation and guaranteed symbol detectability, regardless of the underlying frequency-selective FIR channels. Numerical results are presented to access the performance of the designed training and precoding schemes.

Published in:

Communications, IEEE Transactions on  (Volume:50 ,  Issue: 12 )

Date of Publication:

Dec 2002

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