Simple sampling clock synchronisation scheme for reduced‐guard‐interval coherent optical OFDM systems

Omomukuyo, Oluyemi; Chang, Deyuan; Dobre, Octavia A.; Venkatesan, R.; Ngatched, Telex M. N.

doi:10.1049/el.2015.3064

Cited by 11 publications

(3 citation statements)

References 7 publications

(10 reference statements)

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“…The spread training sequence is modulated with full-response CPM having binary alphabet and modulation index 0.5. The performance metric used is the estimators' variance [34] and it is given in (14),…”

Section: Resultsmentioning

confidence: 99%

“…Also the proposed algorithm can be used to estimate the constant sampling clock offsets (SCOs) in such systems. The SCO is mainly produced by the difference in the frequency of the transmitter sampling clock of digital-to-analog converter and the receiver's sampling clock of analog-to-digital converter [14]. Data aided and non-data aided schemes have been commonly used in the literature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Robust Timing and Phase Offset Estimation Technique for CPM-DSSS-Based Secured Communication Link

Shehzadi¹,

Sheikh²,

Kulsoom

et al. 2021

IEEE Access

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Continuous Phase Modulation-Direct Sequence Spread Spectrum (CPM-DSSS) is a promising scheme for a secured Point-to-Point (P2P) communication system having Anti-Jamming (AJ) capabilities. However, like other communication systems, synchronization of CPM-DSSS based systems is required for reliable detection of data. This paper presents a novel algorithm for estimating the timing and phase offset for binary full-response CPM-DSSS based systems. A burst mode transmission is considered, here, and within each burst, a training sequence is embedded along with data. Firstly, the entire burst is spread using DSSS and then modulated with CPM, which is later upconverted and passed on to the channel. After down-conversion at the receiver, the proposed algorithm estimates timing and phase offset from the received spread training sequence. Then estimation accuracy of the proposed algorithm is compared with the state-of-the-art. The results indicate that the proposed joint estimator is superior by 9 dB and 10 dB for the estimation of timing and phase offset, respectively, as compared to the existing algorithm. Furthermore, the estimator's variance for three different frequency pulses is compared with Modified Cramer-Rao Bound (MCRB). The results show that the phase offset estimator's variance approaches MCRB for all Signal-to-Noise Ratios (SNRs). The effectiveness of the proposed algorithm in the multipath fading channel is also demonstrated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Robust Timing and Phase Offset Estimation Technique for CPM-DSSS-Based Secured Communication Link

Shehzadi¹,

Sheikh²,

Kulsoom

et al. 2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The sampling clock synchronization is based on the principle that the sampling clock offset (SCO) induces a phase rotation which varies linearly with both the OFDM subcarrier and symbol indices [10], [11]. The estimate of the relative SCO, 𝛾 ̂, between the clocks of the DAC and ADC is [10]:…”

Section: Sampling Clock Synchronizationmentioning

confidence: 99%

Bandwidth-efficient synchronization for fiber optic transmission: system performance measurements

Omomukuyo

Dobre

Venkatesan

et al. 2017

IEEE Instrum. Meas. Mag.

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By any measure, the various services and applications which are crucial to today's society rely on fast, efficient, and reliable information exchange. Nowadays, most of this information traffic is carried over long distances by optical fiber, which has intrinsic advantages such as wide transmission bandwidth and low attenuation. However, continuing traffic growth has imposed many challenges, especially for equipment manufacturers who have to develop optical transmission solutions to handle the demand for higher data rates without incurring increased capital and operational costs. A feasible approach to overcoming these challenges is to scale the channel capacity by employing orthogonal frequency division multiplexing (OFDM) superchannels. However, OFDM is sensitive to synchronization errors, which can result in complete failure of the receiver-based digital signal processing. Measurement results of various existing OFDM synchronization methods have highlighted inherent limitations with regards to poor system performance, which determines the quality-of-service level perceived by the end user, and complexity, which throws doubts as to their suitability for implementation in actual equipment. In this article, we first provide a brief overview of optical transmission systems and some of their performance specifications. We then present a simple, robust, and bandwidth-efficient OFDM synchronization method, and carry out measurements to validate the presented synchronization method with the aid of an experimental setup.

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Experimental demonstration of an adaptive SFO pre-compensation scheme for OFDM-PON

Liu

Chen

et al. 2019

Optics Communications

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Simple sampling clock synchronisation scheme for reduced‐guard‐interval coherent optical OFDM systems

Cited by 11 publications

References 7 publications

A Robust Timing and Phase Offset Estimation Technique for CPM-DSSS-Based Secured Communication Link

A Robust Timing and Phase Offset Estimation Technique for CPM-DSSS-Based Secured Communication Link

Bandwidth-efficient synchronization for fiber optic transmission: system performance measurements

Experimental demonstration of an adaptive SFO pre-compensation scheme for OFDM-PON

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