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1 IETR - Institut d-Electronique et de Télécommunications de Rennes 2 IETR - Institut d-Electronique et de Télécommunications de Rennes

Abstract : In contrast to the classical cyclic prefix CP-OFDM, the time domain synchronous TDS-OFDM employs a known pseudo noise PN sequence as guard interval GI. Conventional channel estimation methods for TDS-OFDM are only based on the PN sequence and consequently suffer from intersymbol interference. This paper proposes a novel two-stage channel estimation method which combines the estimation results from the PN sequence and, most importantly, the estimation results obtained from the OFDM data symbols. A simple feedback loop that excludes the channel decoder is employed for the OFDM data based estimation. The MMSE criteria is used to obtain the best combination results and an iterative process is proposed to progressively refine the estimation. Both MSE and BER simulations are carried out to prove the effectiveness of the proposed algorithm in the DTMB system which is based on TDS-OFDM signalling.

keyword : channel estimation data-aided TDS-OFDM





Autor: Ming Liu - Matthieu Crussière - Jean-François Hélard -

Fuente: https://hal.archives-ouvertes.fr/



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