SUMMARY Conventional symbol time (ST) synchronization algorithms for orthogonal frequency-division multiplexing (OFDM) systems are mostly based on the maximum correlation result of the cyclic prefix. Due to the channel effect, the estimated ST is not accurate enough. Hence, one needs to further identify the channel impulse response (CIR) so as to obtain a better ST estimation. Overall, the requ...

Using a glass-box theory of finite domain constraints, FD, we show how the entailment of user-defined constraints can be expressed by antimonotone FD constraints. We also provide an algorithm for checking the entailment and consistency of FD constraints. FD is shown to be expressive enough to allow the definition of arithmetical constraints, as well as nontrivial symbolic constraints, that are ...

A class of higher-order compact upwind biased finite difference (FD) schemes based on the Taylor Series Expansion is developed in this work. The numerical accuracy of this family of compact upwind biased FD schemes is demonstrated by means of Fourier analysis wherein it is shown that these FD schemes have very low dispersion errors over a relatively large bandwidth of wave numbers as compared t...

Diffuse optical tomography (DOT) modality uses diffusion equation solution of low power laser distribution in the imaging tissue. DOT method has three main running mode and geometric subbranches. Run modes are: Continuous Wave (CW), Time Resolved (TR) Frequency Domain (FD) modes. These run might have transmission-through, back-reflected or ring geometry depend on source detector placements tiss...

No systematic validation study is available with optical frequency domain imaging (OFDI), directly compared with frequency domain optical coherence tomography (FD-OCT) and intravascular ultrasound (IVUS). Controversy also remains about the impact of different stent contour tracing methods by OFDI/FD-OCT. In vitro: coronary phantom models (1.51-5.04 mm) were imaged with OFDI, FD-OCT, and IVUS, d...

This paper presents an approach to design observer-based fault detection (FD) systems for continuous linear time-invariant systems directly from frequency domain data. The design doesn’t need knowledge of system model. The computation mainly consists in a singular value decomposition (SVD) and a QR decomposition. The proposed approach is finally illustrated by an example. Copyright c ©2005 IFAC

OBJECTIVES The main objective of this study was to assess the blood flow rate and velocity in coronary artery stenosis using intracoronary frequency domain optical coherence tomography (FD-OCT). A correlation between fractional flow reserve (FFR) and FD-OCT derived blood flow velocity is also included in this study. METHODS & RESULTS A total of 20 coronary stenoses in 15 patients were assesse...

Abstract A novel equalizer for single carrier Digital Television Terrestrial Broadcasting system is proposed. Because of the state-of-art equalization normally uses frequency domain DFE scheme, herein, we suggested combining with a maximum ratio combing (MRC) receiver diversity block and accordingly a frequency domain maximum ratio combing decision feedback filter (FD-MRC-DFE) structure is obta...

Abstract Single-carrier (SC) transmission is an appropriate transmission scheme for uplink transmission because of its low peak-to-average power ratio (PAPR). Spread spectrum (SS) transmission achieves higher frequency diversity gain and hence improves the bit error rate (BER) performance. The authors have recently proposed SC with frequency-domain spread spectrum (SC-FDSS) transmission with or...

In order to suppress inter-symbol interference (ISI), the Frequency domain decision feedback equalization (FD-DFE) algorithm is proposed in this paper for single carrier frequency domain equalization (SC-FDE) combined with Alamouti space time block coding (STBC) systems over frequency-selective channels. We use the cyclic prefix (CP) and two transmit antennas to achieve the significant diversit...