The optimization of QAM signals demodulator
Journal Title: Вісник НТУУ КПІ. Серія Радіотехніка, Радіоапаратобудування - Year 2014, Vol 0, Issue 57
Abstract
Introduction. The processes of signal processing in the quadrature demodulator and the problem of clock synchronization and reference oscillations of quadrature basis providing are considered for a relatively high speed modulation conditions. Main part. The analysis is performed and the basic concepts of the implementation of PLL clock oscillation for optimum decoding of phase of signal elements in the QAM signal are formulated. The approach to unify features a reliable determination of character with no synchronization reference quadrature basis is proposed. The rationale for coherent accumulation of current signal elements for statistical support of clock synchronization process is done. Time values of the signal elements of QAM signal are considered, some rules for operation with circular data buffers while it’s coherent accumulate are formulated. The results of the implementation of coherent clock synchronization in demodulation QAM signals on the example of recommendation ITU-T V.29 is presented. Conclusions. It is shown that the described algorithm of coherent clock synchronization implementation and concepts that formed the basis of its providing reliable clock synchronization during demodulation of QAM signals with high modulation speed.
Authors and Affiliations
O. Pavlov
Keywords
Related Articles
- EP ID EP308997
- DOI 10.20535/RADAP.2014.57.13-22
- Views 101
- Downloads 0
The metod of geometrical simulation of power nonharmonic determined processes and its application in radiotechnic
The example three-dimensional mathematical simulation of determined periodic power processes in radiotechnic circuits (devices) with various parameter and with nonharmonic signals is discussioned in this article. The new...
Reduction of systemotechnical complex model to a level of multielement physical system
Reduction method of systemotechnical complex (STC) model is propose for principal regularity elucidation of part in wholeness unification and analysis of components in STC interaction. The analysis of characters in STC o...
The assesment of sensitivity in Electrical Impedance Tomography by normal transformation method
Introduction. The classifier creation on the base of discrete normal orthogonal transformation to access the advisability of inverse Electrical Impedance Tomography (EIT) solving is proposed. Measured voltages on electro...
Conventional deconvolution in the Fourier transforms. The image degradation inverse matrix construction
Algorithm for symbolic formation of the multiple transformation matrix for the filter parameters matrix reduction to diagonal form is proposed in this paper. The distorted image is adjusted by this filter (degraded thru...
Analysis of ambiguity function of complicated radiolocation signal with binary phase manipulation by Legendre sequence
Introduction. This article consist calculated ambiguity function, autocorrelation function, cross sections of ambiguity function in different planes. Statement of a problem. Is shown the requirements for the correlation...