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Notes to multistage Wiener filter in DS-CDMA detector
Šimša, Jan
The contribution follows report oriented towards design of Wiener filter in DS-CDMA detector of signals as a multistage structure. Such approach avoids evaluation of the inverse of a known autocorrelation matrix of a sampled response of the chip matched filter to a wide-sense stationary input signal. The contribution gives more detailed description of detector signal processing and its consequences.
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DS-CDMA signal blind MMSE detector adaptation
Šimša, Jan
The contribution is focused on multiusxer detection of code-division multiplexewd signals-directsequnce CDMA. A very efficient detection of an ińdividual signal within synchronous CDMA mitigating multiuser interference as well as addditive noise is MMSE multiuser detection.
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Ultra low frequency yeast cells electric activity
Cifra, Michal ; Pokorný, Jiří ; Jelínek, František ; Hašek, Jiří ; Šimša, Jan
This paper presents results from the measurement of the electrical activity cold sensitive beta-tubulin mutant tub2-401 of yeast cells in frequency region 0.4 - 1.6 kHz. 25 measurements of both synchronized and nonsynchronized cells show that the synchronized cells have higher electrical activity what corresponds to the findings of Pohl et al. Mechanical oscillations of electrically polar structures in cell may give rise to electric oscillations we measured.
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Lineární adaptivní slepé MMSE detektory DS-CDMA signálů
Šimša, Jan
Příspěvek je zaměřen na detekci CDMA signálů lineárními adaptivními slepými MMSE detektory. Jsou diskutovány některé algoritmy adaptace a vhodné hodnoty jejich parametrů. Detektory jsou atraktivní vzhledem ke sníženému rozsahu nezbytných apriorních informací o parametrech signálu a vzhledem k adaptaci na jejich změny.
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Simulation of turbo codec
Audrlický, Luděk ; Šimša, Jan
In the contribution the results of simulation of iterative decoding of parallel concatenated convolutionally encoded binary data sequence is presented. The role of the type and the size of interleaver is shortly mentioned. The efficient number of a decoder iterations is evaluated.
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Multiuživatelská detekce
Šimša, Jan
Ve vyžádané přednášce byly shrnuty principy multiuživatalských detektorů pro přijímače v kódovém multiplexu /CDMA/ pracujících digitálních komunikačních systémů a dále uveden přehled detektorů suboptimálních.
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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.
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