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36 results on '"Molnar K"'

15. Cochannel interference suppression with successive cancellation in narrow-band systems.

Author

Arslan, H. and Molnar, K.

Abstract

Successive cancellation of cochannel signals is described in the context of TDMA mobile radio systems employing coherent receivers. Both symbol aligned and mis-aligned cochannel signals are studied. Signal separability, a major problem in successive cancellation of cochannel signals, is obtained using the relative timing delay between cochannel signals. Both hard and soft subtractions are examined. Soft subtraction, along with initial signal separation, leads to significant C/I gains [ABSTRACT FROM PUBLISHER]

Published
2001
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36. Power consumption and RF propagation analysis on ZigBee XBee modules for ATPC

Author

Goran Horvat, Damir Šoštarić, Drago Zagar, and Molnar, K. et. al.

Subjects
Adaptive control, Computer science, business.industry, Node (networking), ZigBee, WSN, Power Consumption, RF Propagation, Adaptive Transmission Power Control, Radio Irregularity, RSSI, Transmitter power output, Network topology, Transmission (telecommunications), Electronic engineering, business, Wireless sensor network, Data transmission, Power control, Computer network
Abstract

Wireless Sensor Networks (WSN) are used in various fields with the purpose of establishing low cost network for data exchange. An important aspect in ZigBee WSN study is the reduction of node power consumption in order to reduce the overall power consumption of a network and to reduce the induced CO 2 emissions. One approach in power consumption reduction is the Adaptive Transmission Power Control (ATPC), where the end nodes reduce their transmit power in certain conditions. This paper analyses the impact of adaptive power control on the power consumption of Digi's XBee PRO WSN modules. To determine the conditions for adaptive power control, this paper presents measurements analysis for indoor RF propagation in order to determine the minimum received signal strength for high data transfer reliability. Sequentially, the impact of radio irregularity on the received signal is shown against numerous factors, and the proposed method for adaptive power control is discussed. It is shown that by implementing ATPC the reduction in power consumption is evident while retaining the data transfer reliability.

Published
2012

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