Branislav Petrovic | University of Niš (original) (raw)

Papers by Branislav Petrovic

Research paper thumbnail of Battery capacity estimation of wireless sensor node

Wireless sensor networks (WSNs) include a large number of distributed sensor nodes that consist o... more Wireless sensor networks (WSNs) include a large number of distributed sensor nodes that consist of sensor, microcontroller and transceiver block. As the main source of energy sensor nodes usually use non-rechargeable batteries, so that the stored energy is a very important resource of a WSN. The main goal of this paper is estimating the battery lifetime of a sensor node in respect to the usage pattern. Calculating the battery remaining capacity is performed in real application conditions by using information from datasheets for all its blocks. Simulation results show that the design and operation modes of the sensor node affect the battery lifetime.

Research paper thumbnail of Elevator System with Dual Power Supply

Modern high-rise buildings require use of a growing number of elevators that have become importan... more Modern high-rise buildings require use of a growing number of elevators that have become important factors in energy consumption. Most of the existing lifts are powered from the grid. In order to reduce grid energy consumption and increase reliability, an improved elevator system which uses dual power supply is proposed in this paper. This system supplies electronic modules of the elevator with renewable sources whenever there is sufficient sunlight and maintains usual work of the elevator in case of electricity power failure. The corresponding architecture of the proposed elevator system and needed battery capacity for correct operation are given in this paper.

Research paper thumbnail of Frequency synthesizer utilizing pulse-width modulation of digital VCO control signal

Research paper thumbnail of Reliable data transfer Rendezvous protocol in wireless sensor networks using 2D-SEC-DED encoding technique

Microelectronics Reliability, 2016

Many applications in Wireless Sensor Networks (WSNs) require all data to be transmitted with mini... more Many applications in Wireless Sensor Networks (WSNs) require all data to be transmitted with minimal or without loss, what implies that reliability is an important characteristic. In any WSN, there are two basic approaches to recover erroneous packets. One way is to use Automatic Repeat reQuest (ARQ), and another is Forward Error Correction (FEC). The error-control systems for applications based on ARQ use error detection coupled with retransmission requests to maximize reliability at some cost to throughput. Error detection is generally provided by the lower protocol layers which use checksums (e.g. Cyclic Redundancy Checksums (CRCs)) to discard corrupted packets and trigger retransmission requests. In these solutions event a single erroneous bit can render a packet useless to the end user. Having in mind that in WSNs the power is scarce and is primarily consumed by wireless transmission and reception, we propose to use FEC rather than ARQ. FEC is a way of correcting packets by transmitting additional information bits with aim to reduce the frequency of retransmission requests. During this, data bytes are optionally encoded after being fragmented with Error Correcting Code (ECC) to recover data bits in case of small number of bit errors. Various FEC encoding schemes such as erasure and Hamming based codes are available. The choice of the encoding schemes depends on the applications and error characteristics (error models/ patterns) of the wireless channel. Erasure encoding is preferable for usage when the error pattern is burst dominated, while Hamming encoding when noise causes random errors. Our observations show that most bit errors are single-bit or double-bit errors and burst errors are present but rare. In this work, an efficient Hamming based FEC encoding scheme of relatively low complexity called Two Dimensional-Single Error Correcting-Double Error Detecting (2D-SEC-DED), intended to minimize packet retransmissions and to save energy, has been developed. Such FEC scheme can be used to correct all single-bit and 99.99%of double/multiple-bit errors. Since the radio block is dominant energy consumer within a Sensor Node (SN), we focus our attention to answer the question: which is the adequate metric to use, and under what conditions to accurately characterize the quality of the communication, related to reliable data transfer, with minimal energy consumption. To this end, as first, in a case when the bit error is not high and most errors are single-bit, we show that 2D SEC-DED encoding scheme is more energy efficient in comparison to erasure encoding. As second, the advantages of using 2D-SEC-DED in respect to CRC (NO-FEC) encoding, concerning decreasing the energy consumption and increasing the reliability of the radio block are derived through implementation of two versions of the Rendezvous Protocol for Long Living (RPLL) referred as Modified-RPLL (M-RPLL as FEC based) and Ordinary-RPLL (O-RPLL as NO-FEC), respectively.

Research paper thumbnail of Power Consumption Analysis of Distributed Lift System

In this paper the distributed power supply for the embedded lift processor system is analyzed, dr... more In this paper the distributed power supply for the embedded lift processor system is analyzed, drawbacks exaggerated and solution is suggested. A basic structure of lift system and practical lift processor realization is described. Power supply requirements for the lift processor are defined accordingly industry standard classifications. Power consumption analyse of the distributed power system is analyzed. The results shown that number of floors is greater than six, a dc/dc structure of floor processor power supply is optimal solution.

Research paper thumbnail of Multi-channel Media Access Control for Wireless Sensor Networks: A survey

2011 10th International Conference on Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS), 2011

This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Netw... more This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Networks (WSNs). We first give an overview of multi-channel communication in WSNs and propose the classification of existing multi-channel MAC protocols for WSNs. Then, we describe briefly three representative protocols by stating their essential behavior and emphasizing their strengths and weaknesses.

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

2007 8th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...

Research paper thumbnail of Propagation delay time measurement through combinational logic circuit using the heterodyne technique

Measurement Science and Technology, 1995

This paper discusses the operating principles of a digital propagation delay time meter based on ... more This paper discusses the operating principles of a digital propagation delay time meter based on the heterodyne technique. It is composed of two independent oscillators, two mixers, phase detector, two counters, a digital-to- analogue converter and microcomputer. The meter is used for propagation delay time measurement through CMOS and TTL combinational logic circuits. An accuracy of 1% and a resolution

Research paper thumbnail of TDMA Protocols with Reduced Frame for Wireless Sensor Networks

Research paper thumbnail of Using adaptive filtering in single-phase grid-connected system

2014 29th International Conference on Microelectronics Proceedings - MIEL 2014, 2014

ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable ene... more ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable energy. In this area power inverters are crucial building blocks in a segment of energy converters, since they change direct current (DC) to alternating current (AC). Grid connected power inverters should operate in synchronism with the grid voltage. In this paper, the structure of a power system based on adaptive filtering is described. The main purpose of the adaptive filter is to adapt the output signal of the inverter to the corresponding load and/or grid signal. By involving adaptive filtering the response time decreases and quality of power delivery to the load or grid increases. A comparative analysis which relates to power system operation without and with adaptive filtering is given. In addition, the impact of variable impedance of load on quality of delivered power is considered. Results which relates to total harmonic distortion (THD) factor are obtained by Matlab/Simulink software.

Research paper thumbnail of TDMA Protocols with Reduced Frame for Wireless Sensor Networks

Research paper thumbnail of Concept of the high reliability motor drive system for lift

Research paper thumbnail of Using adaptive filtering in single-phase grid-connected system

2014 29th International Conference on Microelectronics Proceedings - MIEL 2014, 2014

ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable ene... more ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable energy. In this area power inverters are crucial building blocks in a segment of energy converters, since they change direct current (DC) to alternating current (AC). Grid connected power inverters should operate in synchronism with the grid voltage. In this paper, the structure of a power system based on adaptive filtering is described. The main purpose of the adaptive filter is to adapt the output signal of the inverter to the corresponding load and/or grid signal. By involving adaptive filtering the response time decreases and quality of power delivery to the load or grid increases. A comparative analysis which relates to power system operation without and with adaptive filtering is given. In addition, the impact of variable impedance of load on quality of delivered power is considered. Results which relates to total harmonic distortion (THD) factor are obtained by Matlab/Simulink software.

Research paper thumbnail of OTA-based dual input integrator

International Journal of Electronics, 1992

A new type of dual input integrator (ODI) realized with two operational transconductance amplifie... more A new type of dual input integrator (ODI) realized with two operational transconductance amplifiers (OTAs) is proposed. A compensation of non-ideally matched characteristics of OTAs, based on dividing the integration period into two subintervals, is achieved. Very high linearity and increased frequency and dynamic range are obtained. The ODI is suitable for measurement of very small time differences between two

Research paper thumbnail of Propagation delay time measurement through combinational logic circuit using the heterodyne technique

Measurement Science & Technology, 1995

This paper discusses the operating principles of a digital propagation delay time meter based on ... more This paper discusses the operating principles of a digital propagation delay time meter based on the heterodyne technique. It is composed of two independent oscillators, two mixers, phase detector, two counters, a digital-to- analogue converter and microcomputer. The meter is used for propagation delay time measurement through CMOS and TTL combinational logic circuits. An accuracy of 1% and a resolution

Research paper thumbnail of Wireless sensor node with low-power sensing

Facta universitatis - series: Electronics and Energetics, 2014

Wireless sensor network consists of a large number of simple sensor nodes that collect informatio... more Wireless sensor network consists of a large number of simple sensor nodes that collect information from external environment with sensors, then process the information, and communicate with other neighboring nodes in the network. Usually, sensor nodes operate with exhaustible batteries unattended. Since manual replacement or recharging of the batteries is not an easy, desirable or always possible task, the power consumption becomes a very important issue in the development of these networks. The total power consumption of a node is a result of all steps of the operation: sensing, data processing and radio transmission. In most published papers in literature it is assumed that the sensing subsystem consumes significantly less energy than a radio block. However, this assumption does not apply in numerous applications, especially in the case when power consumption of the sensing activity is comparably bigger than that of a radio. In that context, in this work we focus on the impact of the sensing hardware on the total power consumption of a sensor node. Firstly, we describe the structure of the sensor node architecture, identify its key energy consumption sources, and introduce an energy model for the sensing subsystem as a building block of a node. Secondly, with the aim to reduce energy consumption we investigate joint effectiveness of two common power-saving techniques in a specific sensor node: duty-cycling and power-gating. Duty-cycling is effective at the system level. It is used for switching a node between active and sleep mode (with the dutycycle factor of 1%, the reduction of in dynamic energy consumption is achieved). Power-gating is used at the circuit level with the goal to decrease the power loss due to the leakage current (in our design, the reduction of dynamic and static energy consumption of off-chip sensor elements as constituents of sensing hardware within a node of is achieved). Compared to a sensor node architecture in which both energy saving techniques are omitted, the conducted MATLAB simulation results suggest that in total, thanks to involving duty-cycling and power-gating techniques, a three order of magnitude reduction for sensing activities in energy consumption can be achieved.

Research paper thumbnail of Multi-channel Media Access Control for Wireless Sensor Networks: A survey

2011 10th International Conference on Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS), 2011

This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Netw... more This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Networks (WSNs). We first give an overview of multi-channel communication in WSNs and propose the classification of existing multi-channel MAC protocols for WSNs. Then, we describe briefly three representative protocols by stating their essential behavior and emphasizing their strengths and weaknesses.

Research paper thumbnail of TV link receiver unit realization

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003

In this paper, one practical realization of indoor unit of TV link receiver is described. Receive... more In this paper, one practical realization of indoor unit of TV link receiver is described. Receiver unit is part of microwave radio relay system in 10GHz range. Unit is capable for receiving and demodulating FM signals in baseband of up to 10 MHz. Baseband is divided in two parts. First (0 to 5 MHz) is reserved for video signal, and second (5 MHz to 10 MHz) is for two audio subcarriers. Realization is based on satellite receiver in-door unit structure. It include Samsung BS-Tuner, integrated circuit SGS Thompson STV0042 for video processing and microcontroller unit based on Atmel's AT89C2051.

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

2007 8th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...

Research paper thumbnail of Battery capacity estimation of wireless sensor node

Wireless sensor networks (WSNs) include a large number of distributed sensor nodes that consist o... more Wireless sensor networks (WSNs) include a large number of distributed sensor nodes that consist of sensor, microcontroller and transceiver block. As the main source of energy sensor nodes usually use non-rechargeable batteries, so that the stored energy is a very important resource of a WSN. The main goal of this paper is estimating the battery lifetime of a sensor node in respect to the usage pattern. Calculating the battery remaining capacity is performed in real application conditions by using information from datasheets for all its blocks. Simulation results show that the design and operation modes of the sensor node affect the battery lifetime.

Research paper thumbnail of Elevator System with Dual Power Supply

Modern high-rise buildings require use of a growing number of elevators that have become importan... more Modern high-rise buildings require use of a growing number of elevators that have become important factors in energy consumption. Most of the existing lifts are powered from the grid. In order to reduce grid energy consumption and increase reliability, an improved elevator system which uses dual power supply is proposed in this paper. This system supplies electronic modules of the elevator with renewable sources whenever there is sufficient sunlight and maintains usual work of the elevator in case of electricity power failure. The corresponding architecture of the proposed elevator system and needed battery capacity for correct operation are given in this paper.

Research paper thumbnail of Frequency synthesizer utilizing pulse-width modulation of digital VCO control signal

Research paper thumbnail of Reliable data transfer Rendezvous protocol in wireless sensor networks using 2D-SEC-DED encoding technique

Microelectronics Reliability, 2016

Many applications in Wireless Sensor Networks (WSNs) require all data to be transmitted with mini... more Many applications in Wireless Sensor Networks (WSNs) require all data to be transmitted with minimal or without loss, what implies that reliability is an important characteristic. In any WSN, there are two basic approaches to recover erroneous packets. One way is to use Automatic Repeat reQuest (ARQ), and another is Forward Error Correction (FEC). The error-control systems for applications based on ARQ use error detection coupled with retransmission requests to maximize reliability at some cost to throughput. Error detection is generally provided by the lower protocol layers which use checksums (e.g. Cyclic Redundancy Checksums (CRCs)) to discard corrupted packets and trigger retransmission requests. In these solutions event a single erroneous bit can render a packet useless to the end user. Having in mind that in WSNs the power is scarce and is primarily consumed by wireless transmission and reception, we propose to use FEC rather than ARQ. FEC is a way of correcting packets by transmitting additional information bits with aim to reduce the frequency of retransmission requests. During this, data bytes are optionally encoded after being fragmented with Error Correcting Code (ECC) to recover data bits in case of small number of bit errors. Various FEC encoding schemes such as erasure and Hamming based codes are available. The choice of the encoding schemes depends on the applications and error characteristics (error models/ patterns) of the wireless channel. Erasure encoding is preferable for usage when the error pattern is burst dominated, while Hamming encoding when noise causes random errors. Our observations show that most bit errors are single-bit or double-bit errors and burst errors are present but rare. In this work, an efficient Hamming based FEC encoding scheme of relatively low complexity called Two Dimensional-Single Error Correcting-Double Error Detecting (2D-SEC-DED), intended to minimize packet retransmissions and to save energy, has been developed. Such FEC scheme can be used to correct all single-bit and 99.99%of double/multiple-bit errors. Since the radio block is dominant energy consumer within a Sensor Node (SN), we focus our attention to answer the question: which is the adequate metric to use, and under what conditions to accurately characterize the quality of the communication, related to reliable data transfer, with minimal energy consumption. To this end, as first, in a case when the bit error is not high and most errors are single-bit, we show that 2D SEC-DED encoding scheme is more energy efficient in comparison to erasure encoding. As second, the advantages of using 2D-SEC-DED in respect to CRC (NO-FEC) encoding, concerning decreasing the energy consumption and increasing the reliability of the radio block are derived through implementation of two versions of the Rendezvous Protocol for Long Living (RPLL) referred as Modified-RPLL (M-RPLL as FEC based) and Ordinary-RPLL (O-RPLL as NO-FEC), respectively.

Research paper thumbnail of Power Consumption Analysis of Distributed Lift System

In this paper the distributed power supply for the embedded lift processor system is analyzed, dr... more In this paper the distributed power supply for the embedded lift processor system is analyzed, drawbacks exaggerated and solution is suggested. A basic structure of lift system and practical lift processor realization is described. Power supply requirements for the lift processor are defined accordingly industry standard classifications. Power consumption analyse of the distributed power system is analyzed. The results shown that number of floors is greater than six, a dc/dc structure of floor processor power supply is optimal solution.

Research paper thumbnail of Multi-channel Media Access Control for Wireless Sensor Networks: A survey

2011 10th International Conference on Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS), 2011

This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Netw... more This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Networks (WSNs). We first give an overview of multi-channel communication in WSNs and propose the classification of existing multi-channel MAC protocols for WSNs. Then, we describe briefly three representative protocols by stating their essential behavior and emphasizing their strengths and weaknesses.

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

2007 8th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...

Research paper thumbnail of Propagation delay time measurement through combinational logic circuit using the heterodyne technique

Measurement Science and Technology, 1995

This paper discusses the operating principles of a digital propagation delay time meter based on ... more This paper discusses the operating principles of a digital propagation delay time meter based on the heterodyne technique. It is composed of two independent oscillators, two mixers, phase detector, two counters, a digital-to- analogue converter and microcomputer. The meter is used for propagation delay time measurement through CMOS and TTL combinational logic circuits. An accuracy of 1% and a resolution

Research paper thumbnail of TDMA Protocols with Reduced Frame for Wireless Sensor Networks

Research paper thumbnail of Using adaptive filtering in single-phase grid-connected system

2014 29th International Conference on Microelectronics Proceedings - MIEL 2014, 2014

ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable ene... more ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable energy. In this area power inverters are crucial building blocks in a segment of energy converters, since they change direct current (DC) to alternating current (AC). Grid connected power inverters should operate in synchronism with the grid voltage. In this paper, the structure of a power system based on adaptive filtering is described. The main purpose of the adaptive filter is to adapt the output signal of the inverter to the corresponding load and/or grid signal. By involving adaptive filtering the response time decreases and quality of power delivery to the load or grid increases. A comparative analysis which relates to power system operation without and with adaptive filtering is given. In addition, the impact of variable impedance of load on quality of delivered power is considered. Results which relates to total harmonic distortion (THD) factor are obtained by Matlab/Simulink software.

Research paper thumbnail of TDMA Protocols with Reduced Frame for Wireless Sensor Networks

Research paper thumbnail of Concept of the high reliability motor drive system for lift

Research paper thumbnail of Using adaptive filtering in single-phase grid-connected system

2014 29th International Conference on Microelectronics Proceedings - MIEL 2014, 2014

ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable ene... more ABSTRACT Recently, there has been a pronounced increase of interest in the field of renewable energy. In this area power inverters are crucial building blocks in a segment of energy converters, since they change direct current (DC) to alternating current (AC). Grid connected power inverters should operate in synchronism with the grid voltage. In this paper, the structure of a power system based on adaptive filtering is described. The main purpose of the adaptive filter is to adapt the output signal of the inverter to the corresponding load and/or grid signal. By involving adaptive filtering the response time decreases and quality of power delivery to the load or grid increases. A comparative analysis which relates to power system operation without and with adaptive filtering is given. In addition, the impact of variable impedance of load on quality of delivered power is considered. Results which relates to total harmonic distortion (THD) factor are obtained by Matlab/Simulink software.

Research paper thumbnail of OTA-based dual input integrator

International Journal of Electronics, 1992

A new type of dual input integrator (ODI) realized with two operational transconductance amplifie... more A new type of dual input integrator (ODI) realized with two operational transconductance amplifiers (OTAs) is proposed. A compensation of non-ideally matched characteristics of OTAs, based on dividing the integration period into two subintervals, is achieved. Very high linearity and increased frequency and dynamic range are obtained. The ODI is suitable for measurement of very small time differences between two

Research paper thumbnail of Propagation delay time measurement through combinational logic circuit using the heterodyne technique

Measurement Science & Technology, 1995

This paper discusses the operating principles of a digital propagation delay time meter based on ... more This paper discusses the operating principles of a digital propagation delay time meter based on the heterodyne technique. It is composed of two independent oscillators, two mixers, phase detector, two counters, a digital-to- analogue converter and microcomputer. The meter is used for propagation delay time measurement through CMOS and TTL combinational logic circuits. An accuracy of 1% and a resolution

Research paper thumbnail of Wireless sensor node with low-power sensing

Facta universitatis - series: Electronics and Energetics, 2014

Wireless sensor network consists of a large number of simple sensor nodes that collect informatio... more Wireless sensor network consists of a large number of simple sensor nodes that collect information from external environment with sensors, then process the information, and communicate with other neighboring nodes in the network. Usually, sensor nodes operate with exhaustible batteries unattended. Since manual replacement or recharging of the batteries is not an easy, desirable or always possible task, the power consumption becomes a very important issue in the development of these networks. The total power consumption of a node is a result of all steps of the operation: sensing, data processing and radio transmission. In most published papers in literature it is assumed that the sensing subsystem consumes significantly less energy than a radio block. However, this assumption does not apply in numerous applications, especially in the case when power consumption of the sensing activity is comparably bigger than that of a radio. In that context, in this work we focus on the impact of the sensing hardware on the total power consumption of a sensor node. Firstly, we describe the structure of the sensor node architecture, identify its key energy consumption sources, and introduce an energy model for the sensing subsystem as a building block of a node. Secondly, with the aim to reduce energy consumption we investigate joint effectiveness of two common power-saving techniques in a specific sensor node: duty-cycling and power-gating. Duty-cycling is effective at the system level. It is used for switching a node between active and sleep mode (with the dutycycle factor of 1%, the reduction of in dynamic energy consumption is achieved). Power-gating is used at the circuit level with the goal to decrease the power loss due to the leakage current (in our design, the reduction of dynamic and static energy consumption of off-chip sensor elements as constituents of sensing hardware within a node of is achieved). Compared to a sensor node architecture in which both energy saving techniques are omitted, the conducted MATLAB simulation results suggest that in total, thanks to involving duty-cycling and power-gating techniques, a three order of magnitude reduction for sensing activities in energy consumption can be achieved.

Research paper thumbnail of Multi-channel Media Access Control for Wireless Sensor Networks: A survey

2011 10th International Conference on Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS), 2011

This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Netw... more This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Networks (WSNs). We first give an overview of multi-channel communication in WSNs and propose the classification of existing multi-channel MAC protocols for WSNs. Then, we describe briefly three representative protocols by stating their essential behavior and emphasizing their strengths and weaknesses.

Research paper thumbnail of TV link receiver unit realization

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003

In this paper, one practical realization of indoor unit of TV link receiver is described. Receive... more In this paper, one practical realization of indoor unit of TV link receiver is described. Receiver unit is part of microwave radio relay system in 10GHz range. Unit is capable for receiving and demodulating FM signals in baseband of up to 10 MHz. Baseband is divided in two parts. First (0 to 5 MHz) is reserved for video signal, and second (5 MHz to 10 MHz) is for two audio subcarriers. Realization is based on satellite receiver in-door unit structure. It include Samsung BS-Tuner, integrated circuit SGS Thompson STV0042 for video processing and microcontroller unit based on Atmel's AT89C2051.

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...

Research paper thumbnail of One Realization of Low-Power Wireless Sensor Node

2007 8th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services, 2007

... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović... more ... 502 One Realization of Low-Power Wireless Sensor Node Goran S. Nikolić, Branislav D. Petrović Abstract – In this paper a practical realization of sensor node is described. ... In this paper a data exchange between sensor node and cluster head only bee analyzed. ...