In this paper we propose an alternate approach to collision resolution in a CSMA protocol. Most contention protocols resolve collisions by backing off in time. We introduce spatial backoff, the use of power control to resolve collisions by backing off in space. We call this approach power backoff (PB) and incorporate it into a CSMA protocol as CSMA/PB. Through simulation, we show that collision...

Abstrac tThis paper presents a procedure for the power-optimal design of high-resolution low-bandwidth switched-capacitor (SC) ∆Σ modulators (∆ΣMs). The most power efficient ΔΣ architecture is identified among single-loop switched-capacitor (SC) feedback (FB) and feed-forward (FF) topologies with different loop order N, oversampling ratio OSR, and quantizer resolution B. Based on the results ob...

In this paper the potential of high resolution spectroscopy of nearby AGN with XEUS is discussed. The focus is upon the energy resolution that is needed in order to disentangle the different spectral components. It is shown that there is an urgent need for high spectral resolution, and that a spectral resolution of 1 eV, if possible, leads to a significant increase in diagnostic power as compar...

Power dissipation is becoming an increasingly important issue in the design of analog to digital converters as signal processing systems move into applications requiring either portability, or as in the case of some telecommunications applications, a high degree of parallelism. This research focuses on minimizing power dissipation in high resolution pipelined analog to digital converters, which...

In this paper, an all-digital and low-power reference clock generator with cell-based design for biotelemetry applications is presented. The proposed clock generator employs a cascade-stage structure to achieve high resolution and wide range at the same time. Besides, based on the proposed Schmitt-trigger-based delay cell (STDC), hysteresis delay cell (HDC), and digitally controlled varactor (D...

in this paper power system model is represented in a new domain that relates to multi-resolution analysis (mra) space. by developing mathematical model of elements in this space using galerkin method, a new alternative method for power system simulation in nonsinusoidal and periodic conditions is developed. the mathematical formulation and characteristics of new proposed space is expressed. als...

We have applied the maximum entropy method (MEM) to the analysis of quasi-elastic laser scattering (QELS) spectra and have established a technique for determining capillary wave frequencies with a higher time resolution than that of the conventional procedure. Although the QELS method has an advantage in time resolution over mechanical methods, it requires the averaging of at least 20-100 power...

In speech processing applications, the instantaneous bandwidth of speech can be used to adaptively control the performance of an audio sensor’s analog front end. Extracting the instantaneous bandwidth of speech depends on the detection of speech edges in the time-frequency plane. In this paper, we propose a spike encoding circuit for real-time and low-power speech edge detection. The circuit ca...

High-resolution radars (HRR) using ultra wideband (UWB) signals is a promising system for various detection and ranging applications. The radar resolution increases as a decrease of the pulse width, then radar echoes including background unwanted ones become spiky. Various modifications of constant false alarm rate (CFAR) and matched filters have been proposed to reduce false alarm induced by u...

| Adaptive channel equalization algorithms are commonly used in wireless communications receivers to counter intersymbol interference, multi-path dispersion, and other time varying channel degradations. In this paper we obtain approximate expressions for the increase in mean square error of the LMS adaptive algorithm when the total processing power is decreased by reducing the number of data an...