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In the paper, we will discuss the powerfull class of channel codes referred to as turbo codes. We commence with a brief discussion for MAP and log-MAP decoding algorithms. Then we work with proposed turbo decoding method, which is called as PL-log-MAP. Some numerical results and research experiments, such as simulation for bit error rate estimation and images transmission have been presented. It is...
In the paper, the block diagram and some highlights of transfer microwave radio pulse module based on Gunn diode of 3A768 is considered. Dependences of the diode current and output power on bias voltage are investigated. Characteristics of transmitter are resulted. Output power of 10 Wt in a range of temperatures of ± 50°C is reached.
Device of noise-concealing information coding from the measurement converter and message decoding was developed. The main purpose of the device is transfer information by inhomogeneous communication channels as borehole pipes. Coding is carried out with additional non-information bytes. The algorithm of operation of the decoder is considered. Possibility of receiving of code and improving of the single...
This paper describes different approaches for high resolution short range 3D imaging with ground penetrating radar (GPR) based on research performed at the Radar R&D (Tomsk). Radar R&D is active in the field of GPR technology and its applications more than 15 years. Ultra-wide operational bandwidth in GPR can be used to obtain high-resolution images of targets. In this paper, different approaches...
Ground penetrating radar (GPR) techniques are based on the possibility of sending electromagnetic pulses and registering of the signals back-scattered by the interface between propagation media of different dielectric permittivity. They had been successfully using to examine structures and materials from inside. In the studying, GPR sounding is practically used for detection and reconstruction of...
A method for physical process approximation using the differential Taylor transformation is substantiated. The power basis is transformed to bases of orthogonal Chebyshev polynomials. It is shown that the convergence of series is substantially increased by transition to expansion in Chebyshev polynomials of first kind and shifted Chebyshev polynomials. An algorithm for calculating differential spectrum...
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