Mark J. W. Rodwell

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We present a cross-layer modeling and design approach for multiGigabit indoor wireless personal area networks (WPANs) utilizing the unlicensed millimeter (mm) wave spectrum in the 60 GHz band. Our approach accounts for the following two characteristics that sharply distinguish mm wave networking from that at lower carrier frequencies. First, mm wave links(More)
In this paper, we investigate spatial multiplexing at millimeter (mm) wave carrier frequencies for short-range indoor applications by quantifying fundamental limits in line-of-sight (LOS) environments and then investigating performance in the presence of multipath and LOS blockage. Our contributions are summarized as follows. For linear arrays with(More)
A feedback-based approach is proposed to achieve phase-frequency synchronization among physically isolated sensors. This will enable forming a distributed phased array to significantly increase the communication range between energy-limited sensor fields and the central information collector. A three-element distributed phased array is prototyped based on a(More)
The 7 GHz of unlicensed spectrum in the 60 GHz band offers the potential for multiGigabit indoor wireless personal area networking (WPAN). With recent advances in the speed of silicon (CMOS and SiGe) processes, low-cost transceiver realizations in this "millimeter (mm) wave" band are within reach. However, mm wave communication links are more fragile than(More)
The first antimonide-based compound semiconductor (ABCS) MMIC, a Ka-Band low-noise amplifier using 0.25m gate length InAs/AlSb metamorphic HEMTs, has been fabricated and characterized on a 75 m GaAs substrate. The compact 1.1 mm three-stage Ka-band LNA demonstrated an average of 2.1 dB noise-figure between 34–36 GHz with an associated gain of 22 dB. The(More)
Calibration of sub-converter mismatches is a challenging task for high-performance time-interleaved analog-to-digital converters (TIADC). Presently known blind correction methods can remove static gain and sampling time mismatches. However, actual subconverters significantly deviate from a simple gain-timing model, and the resulting modeling error strictly(More)
We present the design, fabrication, and results from the first monolithically integrated optical phase-locked loop (OPLL) photonic integrated circuit (PIC) suitable for a variety of homodyne and offset phase locking applications. This InP-based PIC contains two sampled-grating distributed reflector (SG-DBR) lasers, semiconductor optical amplifiers (SOAs),(More)
This paper presents recent experimental results from a novel hardware prototype of an outdoor millimeter-wave line-ofsight (LOS) MIMO link. The system architecture establishes multiple parallel data channels using antenna element spacing derived from the principles of diffraction-limited optics. A millimeter-wave carrier frequency reduces the antenna array(More)
Analog-to-digital converters (ADCs) with high sampling rates and output resolution are required for the design of mostly digital transceivers in emerging multi-Gigabit communication systems. A promising approach is to use a timeinterleaved (TI) architecture with slower sub-ADCs in parallel, but mismatch among the sub-ADCs, if left uncompensated, can cause(More)