In order to suppress the influence of phase noise in OFDM communications systems, the correction of the common phase error (CPE) does not suffice always, especially when high data rates are required. In this paper we introduce a phase noise suppression algorithm which estimates higher spectral components of the phase noise process in the frequency domain, thus characterizing the deviation from ...

The paper continues the rigorous investigations of the mean field Green function solution of the effective two-dimensional two-band Hubbard model [N.M. Plakida et al., Phys. Rev. B, 51, 16599 (1995)] of the superconducting phase transitions in cuprates, started in [Gh. Adam, S. Adam, J.Phys.A: Math. Theor., 40, 11205 (2007)]. Discussion of the (δ, T ) phase diagram of the model points to the di...

Frequency synthesizers are used in a large number of time division multiplexed (TDMA) and frequency hopping wireless applications where quickly attaining frequency lock is critical. A new frequency synthesizer is described which employs a scheme for reducing lock time by a factor of two using a conventional phase locked loop architecture. Faster lock is attained by shifting the loop filter’s ze...

Introduction: Previous studies have shown that a Monte Carlo method for the transportations photon beam in medical linear accelerator is a good way. Strip of simulation can be used to measure the dose distribution in phantoms and patients' body. EGSnrc Code is the only code written for use in the field of radiation therapy that has many subset codes that BEAMnrc code is an impo...

The broadband, coherent nature of narrow-linewidth fiber frequency combs is exploited to measure the full complex spectrum of a molecular gas through multiheterodyne spectroscopy. We measure the absorption and phase shift experienced by each of 155 000 individual frequency-comb lines, spaced by 100 MHz and spanning from 1495 to 1620 nm, after passing through hydrogen cyanide gas. The measured p...

In this paper, we investigate the influence of carrier phase jitter on the performance of an OFDM/CDMA system. This carrier phase jitter reduces the performance of the system, defined as the signal-to-noise ratio at the input of the decision device. When all users have the same power level and phase jitter spectrum, it is shown that for the highest load, the degradation only depends on the jitt...

In this paper our aim is to investigate the properties of the modulation domain and more specifically, to evaluate the relative contributions of the modulation magnitude and phase spectra towards speech intelligibility. For this purpose, we extend the traditional (acoustic domain) analysis–modification–synthesis framework to include modulation domain processing. We use this framework to constru...

Stochastic property of speech signal is a fundamental research topic in speech analysis and processing. In this paper, multiple levels of randomness in speech signal are discussed, and the stochastic properties of unvoiced pronunciation are studied in detail, which has not received sufficient research attention before. The study is based on the signals of sustained unvoiced pronunciation captur...

We investigate the quark spectrum in the quark-gluon plasma phase near color superconducting (CS) and chiral phase transitions. Owing to the precursory soft modes of the phase transitions, there appear novel excitaion spectra: In the CS transition, the quark matter shows non-Fermi liquid behavior and leads to the pseudogap in the density of states of quarks. In the chiral transition, three coll...