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Cognitive Radio (CR) is a state-of-the-art technology that provides unlicensed users the capacity to share the wireless spectrum with licensed users in an opportunistic way. However, due to the complexity of Cognitive Radio, it is difficult to be implemented in handheld devices such as PDA or iPAD. The challenging for the design here is mainly about the power consumption and resource utilization....
This paper presents an adaptive MAC protocol applying to battery powered wireless senor monitoring network, which could tolerate a certain amount of packet loss but require long lifetime. We are interested in the tradeoff between power consumption and a certain amount of packet loss which application could tolerate. The adaptive MAC protocol, which would choose pure Aloha based transmission or CSMA...
This paper presents a SystemC-based system-level modeling framework for wireless sensor networks. Benefit from the advantages of SystemC in the aspect of hardware and software co-simulation, this modeling framework allows the performance evaluation of sensor networks at system-level with elaborate sensor node models. It is used to study an industrial application, in which an IEEE 802.15.4 sensor network...
This paper develops a technique, using a built-in detector, for measuring the specifications of RF subsystems and fine-tuning them with a feedback control algorithm. At the same time, optimum power consumption points can be chosen from different biasing schemes. The detector has small area overhead with low frequency output. The sampled output waveform is analyzed using an FFT. The low frequency measurements...
This paper presents the design, optimization and methods for test a high frequency high gain low-noise amplifier (LNA), using a UMC RF 0.18 mum CMOS process. The LNA was designed to be part of a low-power/low-voltage RF CMOS transceiver, for operation in the 2.4 GHz ISM band. The LNA has a power consumption of 3.6 mW, for a power supply of only 1.8 V. The LNA has a control signal that makes it to...
Power consumption is an important design criterion in the design of wireless sensor networks. Hybrid radio frequency/free space optical wireless sensor networks (RF/FSO WSN) have been proposed to reduce the energy consumption of traditional RF-based sensor networks. This paper compares the performance of such a hybrid sensor network against the well-known RF-based low energy adapting clustering hierarchy...
The RF transceivers in MILES are used to trigger firing or communicate informations about the conditions of soldier and weapons. These transceivers have characteristics of low data rate and low power consumption for short range communication on the human body. Therefore, ZigBee devices are the best candidates for this kind of application. Although a ZigBee device operates under very low radiation...
Power wastage is one of the most serious problems at present. The slogan ldquoturn off lights when not in userdquo has long been going around, but lights turned on in unoccupied rooms are frequently seen, particularly in public agencies or schools. The power line communication protocol frame work differs from ones used in the past such as X-10 [1], CEBus [3], LonWorks [6], etc. This system is intended...
Power consumption is an important design consideration for wireless sensor networks (WSNs). Hybrid radio frequency/free space optical (RF/FSO) WSNs have the potential to reduce this power consumption substantially. This paper studies the performance of the RF/FSO WSN by comparing its network lifetime against the lifetime of a traditional RF-only WSN. Two types of networks are considered: reconfiguring...
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