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A digital modulator with bandpass delta-sigma modulator
Proceedings of the 30th European Solid-State Circuits Conference, 2004A digital quadrature modulator with a bandpass ??-modulator is presented that interpolates orthogonal input carriers by 16 and performs a digital quadrature modulation at carrier frequencies fs/4, ?fs/4 (fs is the sampling frequency). After quadrature modulation, the signal is converted into an analogue IF signal using a bandpass ??
Johan Sommarek +4 more
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Digital Single-Sideband Modulation
IEEE Transactions on Communications, 1973This paper considers digitized Weaver modulators for single-sideband modulation that can be used in radio communications and telemetering. A system of 12 such modulators to process 12 analog signals digitally is replaced by six multiplex modulators at the cost of additional computation at the input but with an overall reduction in computation time and ...
S. Singh, K. Renner, S. C. Gupta
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Applied Optics, 1974
Present situations of developments of digital spatial modulators are summarized and new models of the digital spatial modulators made of crystals of gadolinium molybdate are introduced. The first model is of a frame at a time mode. A principle of the design is based on the ferroelectric and ferroelastic properties of the crystal. The second model is of
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Present situations of developments of digital spatial modulators are summarized and new models of the digital spatial modulators made of crystals of gadolinium molybdate are introduced. The first model is of a frame at a time mode. A principle of the design is based on the ferroelectric and ferroelastic properties of the crystal. The second model is of
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Triggering module for waveform digitization
Brain Research Bulletin, 1991A full circuit description is provided for a triggering module used to assist a small laboratory computer in digitizing muscle force- and EMG waveforms. During the stimulation of individual motor units using a standard fatigue test, a train of 13 pulses are delivered at a rate of 40 pps either intracellularly to a motor neuron, or extracellularly to ...
R M, Reinking, Y, Laouris
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Hybrid digital modulation classification
2012 8th International Wireless Communications and Mobile Computing Conference (IWCMC), 2012In this paper, a hybrid modulation classification via Kolmogorov-Smirnov test and cumulant test method for the cognitive network has been proposed. The modulation classification is a method to evaluate the unknown modulation format. In cognitive systems, the cognitive users (CR) can classify the modulation formats of the primary users (PR), which helps
Yuanxuan Li, Fanggang Wang, Gang Zhu
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Compressive modulation in digital communication
2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013Bandwidth efficiency is one of the most important indicators to measure different modulation schemes in digital communication systems. The waveforms of existing modulation schemes are all separated in time domain, making it difficult for them to improve in bandwidth efficiency.
Yingyu Li +3 more
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On the Reduction of Hardware in Digital Modulators
IEEE Transactions on Communications, 1979A Possible simplification of digital modulation (carrier multiplication with sine or cosine signal) is discussed. Using the fact that samples of a sine (or cosine) function are periodic under certain circumstances, a novel implementation is proposed. Depending on the ratio of sampling and carrier frequencies this implementation can lead to a reduction ...
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