| 1. |
- Nilsson, Emil, et al.
(författare)
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A new CMOS radio for low power RFID applications
- 2010
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Ingår i: Proceedings of 2010 IEEE International Conference on RFID-Technology and Applications : June 17-19, 2010 : Dong Fang Hotel, Guangzhou, China.. - Piscataway, N.J. : IEEE Press. - 9781424467006 ; , s. 106-111
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Konferensbidrag (refereegranskat)abstract
- A novel radio receiver circuit, functioning as a tuned active, detecting antenna, is described. The receiver is suggested to be part of a new radio system with the potential of competing with the range capability of active RFID-tags and, through its low power and long lifetime, with passive RFID-tags. The circuit is outlined and the functionality is verified by simulations and measurements.A 24 MHz discrete prototype showed better than -70 dBm sensitivity and 5 kHz bandwidth, with a power consumption of 102 μW. Simulations of a monolithic implementation were performed at 2.5 GHz. The detector is modeled by using 180 nm CMOS transistors. In simulations the power consumption for the detector is below 125 μW at a sensitivity of -83 dBm and a bandwidth of 9 MHz.Our conclusion is that this novel simple circuit architecture is well suited for monolithic implementation of a low power transceiver.
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| 2. |
- Bengtsson, Henrik, et al.
(författare)
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Protocol for wireless real-time systems
- 1999
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Ingår i: Proceedings of the 11th Euromicro Conference on Real-Time Systems, 1999. - Los Alamitos, CA : IEEE Computer Society. - 0769502407 ; , s. 168-174
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Konferensbidrag (refereegranskat)abstract
- A protocol and a communication mechanism intended for time and safety critical applications using a radio channel for information transport are considered jointly. The protocol is based on a scheme of retransmissions done on demand within a given time window. Each retransmission is coded with a varying number of redundant symbols. The set of blocks used for retransmission is controlled by two quality-of-service parameters: deadline for the transmission and the probability that the correct decoded message will reach the recipient before this deadline. Analysis of a protocol model indicates that it is possible to transmit time critical information in a mobile wireless system with very low error probabilities in an industrial environment.
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| 3. |
- Bengtsson, Lars, 1958-, et al.
(författare)
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Brains for Autonomous Robots : Hardware and Surgery Tools
- 1994
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Ingår i: Proceedings of PerAc '94. From Perception to Action. - Los Alamitos : IEEE. - 0818664827 - 9780818664823 ; , s. 436-439
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Konferensbidrag (refereegranskat)abstract
- This paper presents a hardware architecture and a software tool needed for future autonomous robots. Specific attention is given to the execution of artificial neural networks and to the need for a good inspection and visualization tool when developing this kind of systems. Achievable performance using state-of-the-art technology is estimated and module miniaturization issues are discussed. © 1994 IEEE.
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| 4. |
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| 5. |
- Bilstrup, Urban, et al.
(författare)
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A fault tolerance test enabling QoS in a Bluetooth piconet
- 2004
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Konferensbidrag (populärvet., debatt m.m.)abstract
- An important trend, in personal area networks, is that time critical application becomes more common, e.g., voice over IP, video phone calls, network games. This segment of applications demands for quality of service (QoS) guarantees, to provide the correct functionality. The Bluetooth standard provides an optional interface to support QoS guarantees, but the standard does not suggest any actual implementation. A wireless communication channel is stochastic by nature, providing QoS guarantees with this precondition make traditional deterministic real-time theory obsolete. In this paper a probabilistic fault tolerance test enabling quality of service guarantees in a Bluetooth piconet is given. The basic Bluetooth network architecture is based on a master-slave configuration, i.e., a point to point connection. More advanced network architectures are possible where up to eight Bluetooth equipped units can be active members of one network (piconet). Furthermore, several piconets can interconnect and form a so called scatternet.
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| 6. |
- Bilstrup, Urban, et al.
(författare)
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An architecture comparison between a wireless sensor network and an active RFID system
- 2004
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Ingår i: The 29th Annual IEEE International Conference on Local Computer Networks, 2004. - : IEEE. - 0769522602 ; , s. 583-584
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Konferensbidrag (refereegranskat)abstract
- In This work a new hardware platform for active RFID and wireless sensor network is presented. Furthermore a comparison of these two architectures is performed, i.e., the singlehop and the multihop architecture. The comparison reveals important issues regarding the utilization and energy consumption for the singlehop as well as for the multihop architecture.
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| 7. |
- Bilstrup, Urban, et al.
(författare)
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An Implementation of a 3-tier Hierarchical Wireless Sensor Network
- 2006
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Ingår i: 2006 IEEE International Conference on Industrial Informatics. - Piscataway, N.J. : IEEE Press. - 0780397002 ; , s. 138-143
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Konferensbidrag (refereegranskat)abstract
- In this paper an implementation of a wireless sensor network is described. The aim with the implementation is to investigate if present design patterns are applicable on wireless sensor networks. A 3-tier model is adopted as a possible candidate for the software as well as for the network architecture. The implemented wireless sensor network consists of a heterogeneous set of hardware devices such as sensors, sensor hubs, beepers, PDAs and connectors. Most of the hardware components are COTS and most of the software is GNU licensed. All these form a 3-tier hierarchical network architecture.
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| 8. |
- Bilstrup, Urban, et al.
(författare)
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Bluetooth in industrial environment
- 2000
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Ingår i: 2000 IEEE International Workshop on Factory Communication Systems. - Piscataway, N.J. : IEEE Press. - 0780365003 ; , s. 239-246
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Konferensbidrag (refereegranskat)abstract
- In this paper an initial study of the use of Bluetooth in industrial environment is presented. The tests have been performed at a paper-mill, and in an office environment at Halmstad University. It shows the possibility to use Bluetooth for wireless short range communication in an industrial environment.
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| 9. |
- Bilstrup, Urban, et al.
(författare)
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Capacity limitations in wireless sensor networks
- 2003
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Ingår i: ETFA 2003. - Piscataway, N.J. : IEEE. - 0780379373 ; , s. 529-536
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Konferensbidrag (refereegranskat)abstract
- It is expected that wireless sensor network will be used in home automation and industrial manufacturing in the future. The main driving forces for wireless sensor networks are fault tolerance, energy gain and spatial capacity gain. Unfortunately, an often forgotten issue is the capacity limits that the network topology of a wireless sensor network represents. In this paper we identify gains, losses and limitations in a wireless sensor network, using a simplified theoretical network model. Especially, we want to point out the stringent capacity limitations that this simplified network model provide. Where a comparison between the locality of the performed information exchange and the average capacity available for each node is the main contribution.
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| 10. |
- Bilstrup, Urban, 1971-, et al.
(författare)
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Knowledge Horizon - Dynamic limitations in a wireless ad hoc network
- 2003
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Ingår i: SNCNW 2003 Swedish National Computer Networking Workshop 2003 on-line proceedings. ; , s. 1-3
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Konferensbidrag (refereegranskat)abstract
- In this paper we investigate the impact of node mobility in a wireless ad hoc network (WAHN). Especially we investigate the possibility to provide guaranteed services in a WAHN, i.e., the network topology predictability. We combine link expiration time (LET) estimation with information propagation speed (IPS) in a time-space diagram and as result an operation area is revealed. The result gives that a WAHN, where the nodes are mobile, has a knowledge horizon (KH), the distance of which is dependent on the mobility of the nodes. Beyond the KH, knowledge about the network state is impossible to achieve. Thus, we can not predict long distance network topology state when the node mobility is high.
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