A new design of prefilter for reducing timing synchronization jitter

Summary For high‐precision timing synchronization in feedback Gardner algorithm and different feedforward nonlinear algorithms, timing jitter reduction is the key problem, especially with a small roll‐off factor in high‐order modulation. Through the elaborate analysis about the timing jitter, this p...

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Vydané v:International journal of communication systems Ročník 30; číslo 17
Hlavní autori: Chi, Yonggang, Wu, Fenghui, Yang, Mu, Zheng, Yuxi, Chen, Sanbin
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Chichester Wiley Subscription Services, Inc 25.11.2017
Predmet:
Algorithms
Computer simulation
Error detection
Filter design (mathematics)
Gardner detector
Impulse response
Nonlinearity
non‐data‐aided symbol‐timing recovery
pattern noise
prefilter design
Synchronism
Timing jitter
Vibration
ISSN:1074-5351, 1099-1131
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Shrnutí:Summary For high‐precision timing synchronization in feedback Gardner algorithm and different feedforward nonlinear algorithms, timing jitter reduction is the key problem, especially with a small roll‐off factor in high‐order modulation. Through the elaborate analysis about the timing jitter, this paper proposes a new prefilter design method based on finite impulse response structure. Using a suitable Kaiser window for suppressing the sidelobe energy of the proposed prefilter, this method can further decrease the complexity of filter design and eliminate most part of the pattern noise. Compared with the previous prefilter design algorithms, the approach has a better improvement in steady‐state phase jitter reduction without increasing the capture time in Gardner timing error detector. Meanwhile, with such kind of prefilter, the performance of logarithmic nonlinearity is better than that of square law nonlinearity, this is not reported in literature. Simulation results show that the residual timing jitter in both kinds of algorithms is closed to the modified Cramer‐Rao bound when the roll‐off factor is equal to 0.1 in 1024QAM. For the timing jitter reduction in the high‐order modulation, a new prefilter design with finite impulse response structure is proposed, which is suitable for both feedforward nonlinear timing recovery and feedback Gardner timing error detector timing recovery even with a small roll‐off factor. Especially in the feedforward nonlinear timing recovery algorithm, it shows an obvious performance improvement, and the LOGN algorithm outperforms other 3 typical nonlinear algorithms in 1024QAM.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:1074-5351
1099-1131
DOI:10.1002/dac.3354