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—Energy conservation is essential in wireless sensor networks (WSNs) because of limited energy in nodes' batteries. Collaborative beamforming uses multiple transmitters to form antenna arrays; the electromagnetic waves from these antenna arrays can create constructive interferences at the receiver and increase the transmission distance. Each transmitter can(More)
— This paper presents a low power impulse generator design for ultra-wideband (UWB) impulse radio (IR) applications. Simple digital delay elements and a NAND gate are used to generate short duration pulses. A varactor controls the pulse width of the generated signal. The low-end of the spectrum of the generated pulse is attenuated using an integrated(More)
Intensity-modulated radiation therapy (IMRT) requires precise delivery of the prescribed dose of radiation to the target and surrounding tissue. Irradiation of moving body anatomy is possible only if stable, accurate, and reliable information about the moving body structures are provided in real time. This paper presents a magnetic position tracking system(More)
— A capacitively source degenerated buffer provides a negative impedance and can be used as the negative resistance cell in the voltage-controlled oscillator (VCO). This eliminates the need for a negative resistance cell within the VCO itself. Eliminating the negative resistance cell within the VCO allows us to reduce the overall power consumption for a(More)
— This letter analyzes the implementation issues related to coherent receivers for UWB impulse radio with a special emphasis on timing and jitter problems. We propose a new jitter tolerant receiver design that is easy to implement. Analytical BER analysis and simulations verify that the performance of the proposed receiver is comparable to that of a(More)
—Energy efficiency is a major design issue in the context of Wireless Sensor Networks (WSN). If the acquired data is to be sent to a faraway base station, collaborative beamforming performed by the sensors may help to distribute the communication load among the nodes and to reduce fast battery depletion. However, collaborative beamforming techniques are far(More)
  • Chen Wu-Hsin, S Sayilir, R Willmot, Choi Tae-Young, Wu-Hsin, Chen Sanghoon +16 others
  • 2014
A 6-Gb/s wireless inter-chip data link using 43-GHz transceivers and bond-wire antennas" (2009). Abstract—A 43-GHz wireless inter-chip data link including antennas, transmitters, and receivers is presented. The industry standard bonding wires are exploited to provide high efficiency and low-cost antennas. This type of antennas can provide an efficient(More)
The effects of imperfect radiofrequency (RF) pulses on the echo amplitudes from the Carr-Purcell (CP), Carr-Purcell-Meiboom-Gill (CPMG), and the PHase-Alternating Phase-Shift (PHAPS; combination of CP and CPMG) multiple spin-echo schemes were studied. Properties of the PHAPS scheme for transverse relaxation time measurements was emphasized. Numerical(More)