M.I. Spazhakin – Post-graduate Student, Department of Radio Engineering, Voronezh State Technical University;

Engineer, Sector of Digital Signal Processing, Voronezh branch of JSC «IRKOS»

E-mail: spazhakinmi@rambler.ru

S.A. Slinchuk – Associate Professor, Department of Radio Engineering, Voronezh State Technical University E-mail: VGTU-kafRT@yandex.ru

A.B. Tokarev – Dr. Sc. (Eng.), Professor, Department of Radio Engineering, Voronezh State Technical University;

Head of Research Sector, Voronezh branch of JSC «IRKOS»

E-mail: tokarevab@ircoc.vrn.ru

P.P. Churakov – Dr. Sc. (Eng.), Professor, Dean of Faculty «Testing, Information Technologies and Systems», 

Penza State University

Increasing the efficiency of broadband radio monitoring systems is inextricably linked with the application of multi-channel narrowband signal processing when the characteristics of modern narrowband digital communication standards must be evaluated. The aim of the processing to allocate a limited set of previously known channels allows to make the processing of channels in two stages. In the first stage, preliminary filtering, conversion to zero frequency and decimation are applied to wideband signal by digital filter bank, on the second stage - narrowband filtering of the selected set of channels. The article considers an example of development of a two-stage multichannel filter designed for processing signals of the TETRA standard. The estimation and comparison of the output signal’s spectral characteristics of a two-stage filter with the output signal of a one-stage filter are performed. The frequency selectivity of the proposed two-stage approach is compared with the selectivity of a one-stage approach in the presence of a strong signal in the adjacent channel.

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2. A. Palomo Navarro; Tony Keenan; Rudi Villing; Ronan Farrell. Non-uniform channelization methods for next generation SDR PMR base stations // IEEE Symposium on Computers and Communications (ISCC). 2011. P. 620−625.
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9. Spazhakin M.I., Tokarev A.B. Sravnitel'ny'j analiz okonny'x funkczij, ispol'zuemy'x dlya razrabotki bankov czifrovy'x fil'trov mnogokanal'ny'x sistem radiomonitoringa // Cb. trudov XXIII Mezhdunar. NTK «Radiolokacziya, navigacziya, svyaz'». Voronezh: VGU. 2017.
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