Descripción
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Synchronization of the carrier frequency o- set (CFO) in the uplink of OFDMA systems is a com- plex task because each user presents a dierent CFO. It is performed in two stages: estimation and compensa- tion. Although a few existing schemes already achieve good performance in terms of BER, all of them per- form huge amounts of operations, specially during esti- mation, thus leading to very costly, if not impractical, hardware implementations. Additionally, if estimation is performed in the time domain, a preamble is required. Since the IEEE 802.16e standard for OFDMA has no preamble at the beginning of the uplink frame, optional midambles must be used at the cost of reducing the sys- tem throughput. This paper proposes a combined CFO estimation and compensation technique that uses the pilot subcarriers of the 802.16e frame. It achieves simi- lar BER performance than previous approaches without any throughput penalty, while reducing the number of required computations by several orders of magnitude. This reduction is the result of a simpler estimation al- gorithm and two techniques that improve its accuracy: an iterative process integrated with the compensation stage and the delayed correction of the phase shifts. | |
Internacional
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JCR del ISI
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Título de la revista
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Eurasip Journal on Advances in Signal Processing |
ISSN
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1687-6180 |
Factor de impacto JCR
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0,811 |
Información de impacto
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Volumen
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DOI
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Número de revista
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