Loading [a11y]/accessibility-menu.js
W. Soboyejo - IEEE Xplore Author Profile

Showing 1-9 of 9 results

Filter Results

Show

Results

We propose an all-digital UWB transmitter architecture that exploits the low duty cycle of impulse-radio UWB to achieve ultra-low power consumption. The design supports the IEEE 802.15.4a standard and is demonstrated for its mandatory mode. A digitally controlled oscillator produces the RF carrier between 3 and 10 GHz. It is embedded in a phase-aligned frequency-locked loop that starts up in 2 ns ...Show More
Radio transceivers relying on impulsed radio UWB signals show a strong potential for low data rate communications at an ultra low power consumption. They are for instance proposed by the IEEE 802.15.4a low-rate wireless personal area networks standard (LR-WPAN) to support low data rates, low power and low complexity short-range radio communications. In this paper, we give an overview of our recent...Show More
A low-power impulse-radio ultra-wideband receiver is demonstrated for low data-rate applications. A topology selection study demonstrates that the quadrature analog correlation is a good receiver architecture choice when energy consumption must be minimized. The receiver operates in the 3.1-5 GHz band of the UWB FCC spectrum mask on channels of 500 MHz bandwidth. The pulse correlation operation is...Show More
A digital UWB TX that supports the IEEE 802.15.4a standard is presented. A digitally controlled oscillator produces the RF carrier for all bands between 3 and 10GHz. It is embedded in a phase-aligned frequency-locked loop that starts up in 2ns and thus exploits the signal duty-cycle that can be as low as 3%. A digital modulator shapes the BPSK symbols at the required 500MHz chip rate. The energy r...Show More
Impulse-based ultra-wideband systems are appealing for low-power short-range communications as they can benefit from duty-cycled low-complexity analog architectures. Low-power receivers correlate in the analog domain and sample only at the pulse repetition frequency. However, achieving acquisition with such a receiver requires an efficient search strategy, as digital post-processing (equalization)...Show More
Impulse-based ultra-wideband systems are appealing for low-power short-range communications as they can benefit from low-complexity analog architectures. Having such a receiver in mind, we consider two pulse position and code phase acquisition search strategies, as synchronization remains the biggest bottleneck of UWB. Moreover, as the transmitter power consumption increases proportionally with sy...Show More
A 3-to-5GHz quadrature analog correlation RX for UWB impulse radio draws 16mA at 20Mpulses/s, making it suitable for low-power low-data-rate applications. The RX is fully integrated in a CMOS 0.18μm process and comprises an LNA, quadrature LO generation and mixers, baseband filtering, an integrator, timing circuitry, and an ADCShow More
Emerging impulse-based ultra-wideband (UWB) technology shows strong advantages for the implementation of low-power transceivers. In this paper we propose a carrier-based UWB system that brings two distinctive advantages over other UWB systems: 1) lower power operation due to the fact that signal processing is optimally partitioned between analog and digital baseband; 2) better spectrum utilization...Show More
The successful realization of a wireless body area network (WBAN) requires innovative solutions to meet the energy consumption budget of the autonomous sensor nodes. The radio interface is a major challenge, since its power consumption must be reduced below 100 /spl mu/W (energy scavenging limit). The emerging ultra-wide-band (UWB) technology shows strong advantages in reaching this target. First,...Show More