A robust OFDM receiver for DSRC systems

Authors:
Shih-Kai Lee;Han-Wei Chen;Meng-Hsiang Lin;Yung-An Kao
Affiliations:
Department of Communication Engineering, Yuan-Ze University, Chungli, Taoyuan, Taiwan;Department of Communication Engineering, Yuan-Ze University, Chungli, Taoyuan, Taiwan;Department of Communication Engineering, Yuan-Ze University, Chungli, Taoyuan, Taiwan;Department of Electrical Engineering, Chang-Gang Univ.
Venue:
ICCOM'06 Proceedings of the 10th WSEAS international conference on Communications
Year:
2006

Citing 2
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Abstract

OFDM PHY has been selected as North American DSRC standard (IEEE 802.11p). In this paper, we present a robust OFDM receiver suitable for DSRC systems. A synchronizer, a one-tap frequency domain equalizer (FDE), a pilot-based phase estimator and a Viterbi decoder mainly compose it. The equalizer uses normalized least-mean-square (NLMS) algorithm to track not only the variation of the DSRC channel in 5.9GHz band but also the residual frequency/phase errors that are not yet being entirely corrected by the synchronizer device. In order to keep the NLMS equalizer working well, we utilize a pilot-based phase estimator to help estimate them. For getting more improvement, a code decision directed demodulation (CD3) scheme assisted by the decoder outputs could be adopted to help track. The simulation results indicate that our proposed OFDM receiver works fairly well for two DSRC channel models.