Features of quasicogerent signal processing in frequency manipulation telecommunications

DOI №________________

Abstract

The paper represents the principles of analytical description the formation of signals frequency manipulation in telecommunication systems. The peculiarities of quasi-coherent processing of signals of frequency manipulation on the basis of digital frequency downstream transformation with subsequent filtration and multiple decimation are described. The analysis of the influence of finite-dimensional calculations on the quality of signal processing is carried out, which can be further used to select the internal computational discharges of digital downconversions while preserving the given quality of signal processing and hardware costs for its realization. The conditions of realization of the model of the frequency converter with the decrease of the sampling rate on the basis of cascade filters are investigated. The requirements for the selection of signal decimation parameters when eating in the noise conditions are experimentally investigated. The conditions for implementation of the model of the frequency converter with lower frequency sampling based on cascaded filters CIC (Cascaded integrator-comb) filters and formation of characteristics of cascade on the basis of programmable filters (PFIR) are investigated. The results of the study allow to establish the following: the presence of noise in the channel of the digital quadrature heterodyne with a level from zero to half the amplitude of the useful signal can increase the decimation factor of the corrective FIR filter one and a half times. It has been experimentally established that the reduction of the decimation factor of the corrective FIR filter can increase the noise level in the quadrature generator channel, while the amplitude of the useful component at the DDC output decreases and distortion increases.

Keywords: frequency manipulation, interpolation, decimation, signal filtering, telecommunication system.

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