Robust Timing Estimation Method for OFDM Systems With Reduced Complexity

Liu, Yun; Yu, Hua; Ji, Fei; Chen, Fangjiong; Pan, Weiqiang

doi:10.1109/lcomm.2014.2358234

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…As described in [29], [30], differential cross-correlation (DCC), that is immune to CFO, has been widely adopted for the timing detection of pseudo-noise (PN) sequence. In the following, we first utilize this function as the timing metric for E-SCLS, and study its timing estimation performance in RA preamble detection.…”

Section: B Proposed Timing Metric Design Based On Ldccmentioning

confidence: 99%

Energy-Efficient Random Access for LEO Satellite-Assisted 6G Internet of Remote Things

Zhen

Bashir

et al. 2021

IEEE Internet Things J.

182

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Satellite communication system is expected to play a vital role for realizing various remote internet of things (IoT) applications in 6G vision. Due to unique characteristics of satellite environment, one of the main challenges in this system is to accommodate massive random access (RA) requests of IoT devices while minimizing their energy consumptions. In this paper, we focus on the reliable design and detection of RA preamble to effectively enhance the access efficiency in highdynamic low-earth-orbit (LEO) scenarios. To avoid additional signaling overhead and detection process, a long preamble sequence is constructed by concatenating the conjugated and circularly shifted replicas of a single root Zadoff-Chu (ZC) sequence in RA procedure. Moreover, we propose a novel impulse-like timing metric based on length-alterable differential cross-correlation (LDCC), that is immune to carrier frequency offset (CFO) and capable of mitigating the impact of noise on timing estimation. Statistical analysis of the proposed metric reveals that increasing correlation length can obviously promote the output signal-to-noise power ratio, and the first-path detection threshold is independent of noise statistics. Simulation results in different LEO scenarios validate the robustness of the proposed method to severe channel distortion, and show that our method can achieve significant performance enhancement in terms of timing estimation accuracy, success probability of first access, and mean normalized access energy, compared with the existing RA methods.

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Section: B Proposed Timing Metric Design Based On Ldccmentioning

confidence: 99%

Energy-Efficient Random Access for LEO Satellite-Assisted 6G Internet of Remote Things

Zhen

Bashir

et al. 2021

IEEE Internet Things J.

182

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“…In [9][10][11], there are timing methods in which selfcorrelation and cross-correlation are used in combination. Ren et al [9] presented a pseudo-noise-sequence weighted preamble, whose specific structure is then exploited in the timing estimator.…”

Section: Journal Of Computer Network and Communicationsmentioning

confidence: 99%

“…Ren's method improves the accuracy of the timing offset estimator significantly. In [10,11], HM and Liu proposed preamble-independent timing methods, which perform better than all the previous ones since the number of the available correlation terms is far more than that of other methods. It is worth mentioning that the method proposed in [11] has the same performance but it is less computationally complex than that in [10].…”

Section: Journal Of Computer Network and Communicationsmentioning

confidence: 99%

“…is the subset of C . In [10], HM proposed a robust timing method which can exploit all the available product terms defined by (11). HM's estimator gets a significant improvement in timing accuracy compared to Ren's method but performs still unsatisfactorily when the SNR of the received signal is low.…”

Section: Timing Synchronization In [2] Schmidl and Cox Proposed A Pmentioning

confidence: 99%

“…Ren [9] Kang [6] Yang [8] Schmidl [2] HM and Liu [10][11] Ren [9] Kang [6] Yang [8] Schmidl [2] HM and Liu [10][11] Proposed all the available correlation products in the simulation. It is evident that the proposed method has a remarkably better performance than others.…”

Section: Journal Of Computer Network and Communicationsmentioning

confidence: 99%

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Robust Preamble-Based Timing Synchronization for OFDM Systems

Liu

et al. 2017

Journal of Computer Networks and Communications

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This study presents a novel preamble-based timing offset estimation method for orthogonal frequency division multiplexing (OFDM) systems. The proposed method is robust, immune to the carrier frequency offset (CFO), and independent of the structure of the preamble. The performance of the new method is demonstrated in terms of mean square error (MSE) obtained by simulation in multipath fading channels. The results indicate that the new method significantly improves timing performance in comparison with existing methods.

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