because of urgent needs of groundwater resources in the tochal region of north tehran, an integration of electric and electromagnetic methods was applied to investigate the location and the direction of water bearing fractures. first, the vlf electromagnetic profiling was performed on suitable places and two locations were detected for supplementary resistivity surveys. then, a number of vertic...

Application Note 1313 2 The demand for ubiquitous wireless communications is challenging the physical constraints placed upon current wireless communications systems. In addition, wireless customers expect wireline quality from their service providers. Service providers have invested a lot in a very limited slice of the radio spectrum. Consequently, network equipment manufacturers must produce ...

To fully utilize the available spectrum for a wireless communication system it is feasible to adapt to different situations on the channel as well as different systems with various quality of service. In this paper a generic OFDM transmitter is presented and it is shown that high flexibility can be obtained with a reasonable amount of additional hardware. Part of the design, the FFT-processor, ...

This paper deals on converting mechanical impact on piezoelectric plate into electrical energy and using this harvested energy to power a wireless sensor node (WSN). Here we discuss on the power processing unit which consists of rectification, storage and regulation of voltage. The wireless sensor node senses the ambient vibrations around it and uses the harvested energy to send unique identifi...

A wireless interconnect system which transmits and receives RF signals across a chip using integrated antennas, receivers, and transmitters is proposed and demonstrated. The transmitter consists of a voltage-controlled oscillator, an output amplifier, and an antenna, while the receiver consists of an antenna, a low-noise amplifier, a frequency divider, and buffers. Using a 0.18m CMOS technology...

The capacity of wireless ad-hoc network is enhanced with rate adaptive algorithms. For rate adaptation, feedback of channel condition is essential. One of the ways to achieve this is the Cross-Layer Design (CLD) approach. The key idea is to exploit the channel condition by optimal selection of data rate. The data rate can be decided at transmitter or receiver to achieve the goal of capacity enh...

Indoor Wireless Communi ation Systems J. He, A. Verstak, L. T. Watson, Fellow, IEEE, C. A. Stinson, N. Ramakrishnan, C. A. Sha er, T. S. Rappaport, Fellow, IEEE, C. R. Anderson, Student Member, IEEE, K. Bae, Student Member, IEEE, J. Jiang, Student Member, IEEE, and W. H. Tranter, Fellow, IEEE Abstra t|In this paper, a global optimization te hnique is applied to solve the optimal transmitter pla...