On economical timing-error detectors for QAM receivers

Pelet, E.R.; Salt, J.E.

doi:10.1049/iet-com:20060554

Cited by 4 publications

(7 citation statements)

References 8 publications

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“…The MSE of the Gardner TED is evaluated after the loop reaching to steady state. Our results are compared to the simulation results using the traditional bandpass filter in D'Andrea and Luise and the simplified highpass filter in . The curves after adding the prefilter are shown with a solid line in Figure and Figure .…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Our results are compared to the simulation results using the traditional bandpass filter in D'Andrea and Luise 22 and the simplified highpass filter in. 24 The curves after adding the prefilter are shown with a solid line in Figure 9 and Figure 10. According to the simulation results, we can see that most of the pattern noise is suppressed by the proposed prefilter.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The algorithm proposed in the literature is systematically analyzed, and the theoretical derivation and the closed‐form expression of the loop are obtained in Pelet and Salt . In order to simplify the system design in D'Andrea and Luise, Pelet proposed a highpass infinite impulse response filter to eliminate the low‐frequency timing components in the Gardner timing error detector (TED) at the cost of accuracy degradation . Similarly, a combination of prefilter and postfilter design method can almost achieve jitter‐free timing estimation in the square‐law nonlinear (SLN) algorithm .…”

Section: Introductionmentioning

confidence: 99%

“…Even when the roll‐off factor is equal to 0.1, the most parts of the pattern noise are removed, and the timing estimation accuracy of 2 kinds of algorithms is still closed to MCRB. Compared with the algorithms in D'Andrea and Luise and Pelet and Salt, the proposed method can simplify the filter design process without performance degradation.…”

Section: Introductionmentioning

confidence: 99%

“…23 In order to simplify the system design in D'Andrea and Luise, 22 Pelet proposed a highpass infinite impulse response filter to eliminate the low-frequency timing components in the Gardner timing error detector (TED) at the cost of accuracy degradation. 24 Similarly, a combination of prefilter and postfilter design method can almost achieve jitter-free timing estimation in the square-law nonlinear (SLN) algorithm. 25 The biggest challenge in these prefilter design methods is that the filter coefficients need to be calculated during the real-time iteration, and the design result lacks generality in different systems.…”

Section: Introductionmentioning

confidence: 99%

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A new design of prefilter for reducing timing synchronization jitter

Chi

et al. 2017

Int J Communication

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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.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new design of prefilter for reducing timing synchronization jitter

Chi

et al. 2017

Int J Communication

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Feedback Timing Method Based on Joint Optimization Function of Code Period and Timing Parameters in Non-Cooperative Communication

Qin

Wang

et al. 2019

IEEE Access

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In non-cooperative communication, the code frequency, the pulse shaping filter and other prior parameters are unknown to the receiver, which increases the challenge of non-cooperative receiving system design. A straightforward method may estimate these parameters in advance following traditional receiving systems. Estimation errors will undoubtedly be involved and passed between stages, which will decease system performance, especially in low signal-to-noise ratio (SNR) scenarios. To address this problem, this paper constructs a carefully designed optimization function for timing estimation that combines both the code frequencies and the timing parameters from multiple chips. Consequently, a feedback-based tracking model is proposed to solve such an optimization function. Finally, extensive simulation results validate the efficiency of the proposed method, which achieves ten times better accuracy than the traditional method and can partially overcome the influence of code frequency deviations. INDEX TERMS Non-cooperative communication, timing estimation, Gardner detector, self-noise, early-late detector, code loop tracking.

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