Low-complexity joint synchronization of symbol timing and carrier frequency for OFDM systems
Timing synchronization for guard-interval-based (GIB) orthogonal frequency multiplexing (OFDM) systems requires a correlator to correlate the last N/sub g/ (length of the guard interval) samples of the received OFDM symbol with their copies ahead. The straightforward implementation of this correlato...
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Published in | IEEE transactions on consumer electronics Vol. 51; no. 3; pp. 783 - 789 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
01.08.2005
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
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Abstract | Timing synchronization for guard-interval-based (GIB) orthogonal frequency multiplexing (OFDM) systems requires a correlator to correlate the last N/sub g/ (length of the guard interval) samples of the received OFDM symbol with their copies ahead. The straightforward implementation of this correlator results in the need to perform N/sub g/ complex additions for each correlator output. In this paper, we present an improved synchronization algorithm for the coarse joint estimation of symbol timing and carrier frequency offset. With the proposed algorithm, the coarse estimator can be implemented with extremely low hardware complexity by replacing the conventional correlator with a l-order low pass filter. Only one complex addition is needed for each output. The probability for frequency offset estimation error is analyzed for ideal channel. Simulation results show that it works reliably over both AWGN and multipath fading channels. |
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AbstractList | Timing synchronization for guard-interval-based (GIB) orthogonal frequency multiplexing (OFDM) systems requires a correlator to correlate the last N/sub g/ (length of the guard interval) samples of the received OFDM symbol with their copies ahead. The straightforward implementation of this correlator results in the need to perform N/sub g/ complex additions for each correlator output. In this paper, we present an improved synchronization algorithm for the coarse joint estimation of symbol timing and carrier frequency offset. With the proposed algorithm, the coarse estimator can be implemented with extremely low hardware complexity by replacing the conventional correlator with a l-order low pass filter. Only one complex addition is needed for each output. The probability for frequency offset estimation error is analyzed for ideal channel. Simulation results show that it works reliably over both AWGN and multipath fading channels. |
Author | Jue Tang Bo Shen Huarong Zheng |
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Cites_doi | 10.1109/26.380121 10.1109/VETEC.1997.605870 10.1109/78.599949 10.1109/25.790537 |
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Copyright | Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2005 |
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Snippet | Timing synchronization for guard-interval-based (GIB) orthogonal frequency multiplexing (OFDM) systems requires a correlator to correlate the last N/sub g/... Timing synchronization for guard-interval-based (GIB) orthogonal frequency multiplexing (OFDM) systems requires a correlator to correlate the last N sub(g)... |
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SubjectTerms | Algorithms Carrier frequencies Channels Correlation Correlators Error analysis Estimation error Frequency division multiplexing Frequency estimation Frequency synchronization Hardware Low pass filters OFDM Orthogonal Frequency Division Multiplexing Symbols Synchronism Synchronization Time measurements Timing |
Title | Low-complexity joint synchronization of symbol timing and carrier frequency for OFDM systems |
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