This work proposes a novel demodulation circuit to address the implementation of Wake-Up Receivers (Wu-Rx) in Wireless Sensor Nodes (WSN). This RF demodulator, namely Modulated Oscillator for envelOpe Detection (MOOD), is compatible with both FSK and OOK/ASK modulation schemes. The system embeds an LC oscillator, an envelope detector and a base-band amplifier. To optimize the trade-off between ...

This paper presents a system based on five-port demodulator which measures DoA (directions-of-arrival) of radio frequency signals received on an antenna array in the azimuth plane. The receiver operating at 2.4 GHz is composed of four five-port demodulators connected to a ULA (uniform linear array) of four patch antennas. The DoA is estimated by measuring the phase difference of signals picked ...

The photoelastic modulation-reflection absorption infrared spectrum ~PEM-RAIRS! of CO on single crystal Pd~111! is measured for CO pressures up to ;150 Torr. The ac component of the signal, corresponding to the infrared signal of the surface, is measured using a synchronous demodulator circuit rather than using a lock-in amplifier as used in previous experiments to measure the infrared spectra ...

It has been recently shown that minimum-meansquared-error (MMSE) demodulators are effective means of interference suppression in code-division multiple-access (CDMA) systems. The MMSE demodulator can be implemented adaptively using an initial training sequence, followed by decision-directed adaptation. This requires that the symbol-level timing of the desired user be known prior to training. In...

In this review paper, traditional and novel demodulation methods applicable to amplitude-modulation atomic force microscopy are implemented on a widely used digital processing system. As a crucial bandwidth-limiting component in the z-axis feedback loop of an atomic force microscope, the purpose of the demodulator is to obtain estimates of amplitude and phase of the cantilever deflection signal...

We evaluate the average number of locally minimal solutions for maximum-a-posteriori (MAP) demodulation in code-division multiple-access (CDMA) systems. For this purpose, we use a sophisticated method to investigate the ground state properties for the Sherrington-Kirkpatrick-type (i.e. fully connected) spin glasses established by Tanaka and Edwards in 1980. We derive the number of locally minim...

Recently, a digital baseband receiver called zerointermediate frequency zero-crossing demodulator (ZIFZCD) was developed for digital FM signal detection. ZIFZCD is applicable to many worldwide mobile and personal communications systems. In addition, ZIFZCD offers lower power consumption and simpler implementation, compared to the conventional analog implementation [e.g., a limiter-discriminator...

A receiver structure suitable for coded M-ary DPSK signals on static and time-varying channels is investigated. The transmitter consists of a convolutional code, an interleaver, and a diierential encoder, and hence represents a type of \serial turbo code". In the receiver, the kernel is an a posteriori probability (APP) demodulator. A priori information is accepted and reliability outputs are p...

This report establishes the "effective noise power bandwidths" and "noise reduction factors" of a resettable integrator and of conventional passive lowpass filters. It then discusses the use of the resettable integrator with its necessary sample and hold circuit, as compared to the use of a passive lowpass filter which follows the receiver demodulator in time-division data transmission systems,...

A new sequential phase demodulator based on a Regularized Quadrature and Phase Tracking system (RQPT) is applied to demodulate two-dimensional fringe patterns. This RQPT system tracks the fringe pattern’s quadrature and phase in a sequential way following the path of the fringes. To make the RQPT system more robust to noise the modulating phase around a small neighborhood is modeled as a plane ...