A BPSK/QPSK Timing-Error Detector for Sampled Receivers

Gardner, F. F.

doi:10.1109/tcom.1986.1096561

Cited by 694 publications

(241 citation statements)

References 7 publications

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“…In practice, p(t) is often root-raised cosine with roll-off factor (ρ) ranging between 0.2 and 0.5 [33][34][35][36]. For FSK modulation, rectangular pulse shape is commonly used [1].…”

Section: Signal Modelmentioning

confidence: 99%

Automatic modulation classification of digital modulations in presence of HF noise

Hazza

Shoaib

Alshebeili

et al. 2012

EURASIP J. Adv. Signal Process.

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Designing an automatic modulation classifier (AMC) for high frequency (HF) band is a research challenge. This is due to the recent observation that noise distribution in HF band is changing over time. Existing AMCs are often designed for one type of noise distribution, e.g., additive white Gaussian noise. This means their performance is severely compromised in the presence of HF noise. Therefore, an AMC capable of mitigating the time-varying nature of HF noise is required. This article presents a robust AMC method for the classification of FSK, PSK, OQPSK, QAM, and amplitude-phase shift keying modulations in presence of HF noise using feature-based methods. Here, extracted features are insensitive to symbol synchronization and carrier frequency and phase offsets. The proposed AMC method is simple to implement as it uses decision-tree approach with pre-computed thresholds for signal classification. In addition, it is capable to classify type and order of modulation in both Gaussian and non-Gaussian environments.

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“…In practice, p(t) is often root-raised cosine with roll-off factor (ρ) ranging between 0.2 and 0.5 [33][34][35][36]. For FSK modulation, rectangular pulse shape is commonly used [1].…”

Section: Signal Modelmentioning

confidence: 99%

Automatic modulation classification of digital modulations in presence of HF noise

Hazza

Shoaib

Alshebeili

et al. 2012

EURASIP J. Adv. Signal Process.

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“…El hardware disponible para este prototipo, especialmente el ADC, permite obtener como máximo dos muestras/símbolo; por otra parte, sería mejor si la implementación consigue un buen balance entre complejidad y desempeño, de aquí que se ha seleccionado el detector de error propuesto por Gardner [5,6].…”

Section: A Detector Del Error De Sincronización (Ted)unclassified

mplementación en FPGA de un sistema totalmente digital de recuperación de reloj

Cardenas

Arévalo

2011

ings

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ResumenLa recuperación de la señal de reloj y de datos CDR es un subsistema importante de cada dispositivo de comunicaciones dado que el receptor debe recuperar la información exacta del reloj del transmisor, misma que está usualmente codificada dentro de la trama de datos entrante. Se han desarrollado algunas técnicas analógicas para CDR basadas en la teoría de PLLs empleando un VCO externo. Sin embargo, en algunas ocasiones la conexión del núcleo digital (FPGA, DSP) con los componentes externos puede resultar complicada. De este modo, el núcleo digital es también utilizado para solventar la tarea de la recuperación de la señal de reloj mediante técnicas totalmente digitales, sin el uso de un VCO externo. El presente artículo describe un subsistema totalmente digital de recuperación de señal de reloj, implementado en un FPGA.

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“…The Non Data-Aided (NDA) symbol clock estimation scheme proposed by Gardner [20] can be applied, since it works without any data knowledge and exhibits very satisfactory performance even at low signal-to-noise ratios. Extraction of the k-th normalized sampling epoch k is performed recursively via the following "closed-loop" equation,…”

Section: A Timing Recoverymentioning

confidence: 99%

“…As observed in [20], the timing discriminator performance is invariant to carrier phase, so that timing information can be extracted without prior acquisition of the carrier recovery loop. As for the digital timing interpolator, we employed the cubic interpolator described in [21] and [22].…”

Section: A Timing Recoverymentioning

confidence: 99%

“…At the receiver side, we used the NDA approach of [20] for timing recovery, while for amplitude and phase recovery we used the approach described in [14], with the following parameters: AGC adaptation step γ α = 10 [9]. However, in the nonlinear channel, simulation results demonstrate the superior performance of the proposed 16-APSK modulation.…”

Section: B Trellis-coded Apskmentioning

confidence: 99%

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Performance analysis of turbo-coded APSK modulations over nonlinear satellite channels

Gaudenzi

Guillen

Martinez

2006

IEEE Trans. Wireless Commun.

159

117

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Abstract-This paper investigates the performance of M -ary Amplitude-Phase Shift Keying (APSK) digital modulation over typical nonlinear satellite channels. The effect of the satellite nonlinearity is studied, and distortion pre-and post-compensation techniques for coded APSK are presented. Moreover, clock timing, signal amplitude and carrier phase recovery schemes are discussed. For the latter, a new class of non turbo decoder-aided closed-loop phase synchronizers featuring good performance and low complexity is studied. Finally, an end-to-end coded APSK system simulator inclusive of the satellite channel model and synchronization sub-systems is discussed and its performance compared to standard trellis-coded QAM concatenated with Reed-Solomon codes, showing a remarkable gain in both power and spectral efficiency. Coded APSK, recently selected for the new standard -DVB-S2-for digital video broadcasting and interactive broadband satellite services [1], is shown to represent a power-and spectral-efficient solution for satellite nonlinear channels.

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A BPSK/QPSK Timing-Error Detector for Sampled Receivers

Cited by 694 publications

References 7 publications

Automatic modulation classification of digital modulations in presence of HF noise

Automatic modulation classification of digital modulations in presence of HF noise

mplementación en FPGA de un sistema totalmente digital de recuperación de reloj

Performance analysis of turbo-coded APSK modulations over nonlinear satellite channels

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