Národní úložiště šedé literatury Nalezeno 5 záznamů.  Hledání trvalo 0.00 vteřin. 
Analysis of influence of code doppler on mean acquisition time in direct sequence spread spectrum communication systems with serial search
Bezucha, Petr ; Hovorka, Ladislav
This contribution shows influence of code Doppler on mean acquisition time of a serial search direct-sequence spread/spectrum pseudo/noise code acquisition system in Gaussian channel. Results of this analysis enable us to set the parameters of this system to the optimum values and minimize the mean acquisition time.
Derivation of the network properties from the energetic model of .sub.m-./sub. port
Braun, Jaromír ; Žilka, Zdeněk ; Berka, Zbyněk
Flow of energy in the complex systems is the basic phenomenon of real communication systems. This phenomenon have to be taken into account in the theory of "black box model" of arbitrary dynamic system.
Interconnections in electronic systems and signal integrity faults
Žilka, Zdeněk ; Berka, Zbyněk ; Braun, Jaromír
Signal integrity can be verified before the availability of the actual produced system on its accurate virtual prototype (VP). In this paper simple models are described which are particularly useful when the design is amended after the VP verification failed.
Receivers for CDMA systems
Hovorka, Ladislav ; Šimša, Jan
In the contribution the optimum and suboptimum methods of code division multiple access (CDMA) multiuser detectors (MUD) are summarised. The need of estimation of codes timings and amplitudes of individual users are discussed.
Frequency stability of fractional-N synthesizers
Kroupa, Věnceslav František ; Štursa, Jarmil
The spectral properties of the PLL frequency synthesizer operating in the fractional-N mode are investigated. This operation is based on the swallowing of pulses in the feedback path of the PLL. The pulse swallower is controlled by the steering signal which is generated by the network DDFS operating as a ä-delta modulator of a given order. The influence of the modulator order on phase spectrum of the steering signal is shown.

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