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Digital Implementation (digital + implementation)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

Digital implementation of cellular sensor-computers

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 4 2006
Péter Földesy
Abstract A bit-sliced digital implementation method of the cellular sensor-computer is proposed. The proposed sensor-computer architecture is analysed, and an implementation example is introduced. The analogue and the digital implementation methods are compared. It is found that on or below 0.18 µm technology the digital implementation of the cellular sensor-computer is a viable alternative to the analogue versions in general-purpose designs. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Intermediate frequency zero-crossing detection of filtered MSK based on irregular sampling

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 7 2007
Tobias Scholand
Short range communication systems such as Bluetooth and DECT (Digital Enhanced Cordless Telecommunications) deploy Gaussian frequency shift keying (GFSK), which is a continuous phase modulation (CPM) scheme derived from minimum shift keying (MSK). Since these short range communication systems require low-cost transceiver structures, the development of appropriate receiver techniques has been a major research topic. Particularly, analogue limiter--discriminator--integrator (LDI) dump filtering techniques have received considerable attention. With the availability of digital signal processing (DSP), the digital implementation of LDI techniques has become increasingly attractive. In order to make LDI receivers more accessible, zero-crossing detection was proposed. First, the authors shall focus on the establishment of an appropriate mathematical discrete-time system model, taking bandlimiting receiver filters into account explicitly. This system model serves as the basis for the development of a multitude of digital zero-crossing detection techniques. Starting from this mathematical discrete-time system model, the authors shall focus on a novel, yet promising, approach to digital zero-crossing detection in the intermediate frequency domain, using irregular sampling instead of the commonly employed regular sampling. The novel detectors shall be termed zero-crossing decorrelation detectors (ZXDDs), because a decorrelating approach will be used. The authors shall present three different variants of the ZXDD. The performance of these ZXDD schemes has been analysed in simulations by the authors and obtained results shall be presented and compared to the performance of known LDI and zero-crossing detection based techniques. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Feedforward joint phase and timing estimation for MSK,type signals

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 4 2001
Michele Morelli
Novel non data,aided (NDA) algorithms are proposed for joint estimation of timing and carrier phase in MSK,type modulations. They are based on maximum likelihood methods and have a feedforward structure which is suitable to fully digital implementation. Performance with MSK and Gaussian MSK. (GMSK) is assessed by computer simulations and compared with that of other existing estimation schemes. [source]