A Robust Timing Synchronization Method for OFDM Systems over Multipath Fading Channels

Yang, Han; Li, Lintao; Li, Jiaxuan

doi:10.1109/iccc49849.2020.9238856

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…The simulation results showed that the algorithm could obtain accurate STO estimations due to its timing metric, which had a sharp and clear peak. In 2020, Yang et al [ 17 ] presented a robust timing synchronization method based on a fast timing search window and a dual threshold decision. The fast timing search window effectively reduced the probability of false alarms, and the dual threshold judgment reduced the probability of acquisition loss.…”

Section: Related Workmentioning

confidence: 99%

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Peng

et al. 2023

Sensors

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Since orthogonal frequency division multiplexing (OFDM) systems are very susceptible to symbol timing offset (STO) and carrier frequency offset (CFO), which cause inter-symbol interference (ISI) and inter-carrier interference (ICI), accurate STO and CFO estimations are very important. In this study, first, a new preamble structure based on the Zadoff–Chu (ZC) sequences was designed. On this basis, we proposed a new timing synchronization algorithm, called the continuous correlation peak detection (CCPD) algorithm, and its improved algorithm: the accumulated correlation peak detection (ACPD) algorithm. Next, the correlation peaks that were obtained during the timing synchronization were used for the frequency offset estimation. For this, the quadratic interpolation algorithm was adopted as the frequency offset estimation algorithm, which was better than the fast Fourier transform (FFT) algorithm. The simulation results showed that when the correct timing probability reached 100%, under the parameters of m = 8 and N = 512, the performance of the CCPD algorithm was 4 dB higher than that of Du’s algorithm, and that of the ACPD algorithm was 7 dB. Under the same parameters, the quadratic interpolation algorithm also had a great performance improvement in both small and large frequency offsets, when compared with the FFT algorithm.

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Section: Related Workmentioning

confidence: 99%

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Peng

et al. 2023

Sensors

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“…For example, in Doblado and others [18], data aids or preamble added to the main signal are used to estimate synchronization errors. Also, in the article [19], using the CAZAC sequence, synchronization was proposed based on fast timing search window and double‐threshold for decision making. This algorithm is based on the correlation between known sequences in a signal.…”

Section: Introductionmentioning

confidence: 99%

Joint synchronization and parameter estimation in OFDM signaling

Karami

Bahramgiri

2022

ETRI Journal

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Challenges in cognitive radio and tactical communications include recognizing anonymously received signals and estimating parameters in a blind or semiblind manner. In this paper, we examine this issue for orthogonal frequency division multiplexing (OFDM) signaling. There are several parameters in OFDM signaling, and the blind receiver must extract and consider the synchronization issue. We assume that the blind receiver is aware of modulation type, OFDM, and not aware of chip duration and the length of cyclic prefix. First, we present new criteria based on kurtosis to estimate these parameters and compare their performance at different levels of additive white Gaussian noise with methods based on correlation, kurtosis, maximum likelihood, and matched filter. Then, we perform synchronization and estimate the start time based on these criteria and several new criteria in two steps: fine and coarse synchronization. Finally, in a more practical setup, we present the idea of jointly estimating the mentioned parameters and the signal start time as coarse synchronization. We compare different criteria and show that one of the proposed criteria has the highest efficiency.

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