Design and implementation of synchronization and AGC for OFDM-based WLAN receivers

Authors:
V. P.G. Jimenez;M. J.F.-G. Garcia;F. J.G. Serrano;A. G. Armada
Affiliations:
Dept. of Signal Theory & Commun., Carlos III Univ., Madrid, Spain;-;-;-
Venue:
IEEE Transactions on Consumer Electronics
Year:
2004

Citing 0
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An improved residual frequency offset estimation scheme for OFDM based WLAN systems

Digital Signal Processing
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Proceedings of the 19th annual international conference on Mobile computing & networking

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Abstract

An efficient implementation of several tasks at the receiver becomes crucial in OFDM-based high-speed WLAN systems, such as automatic gain control, time and frequency synchronization, and offset tracking. This paper deals with fixed point constraints and accuracy requirements for implementation of those algorithms. Also, a complete set of thresholds for the practical implementation of time and frequency synchronization sub-blocks is obtained. Moreover, a technique to mitigate the remaining frequency offset after coarse acquisition is proposed, yielding a good trade-off between performance and complexity. Finally, we propose the implementation of a simple and effective automatic gain control procedure.