Instantaneous Frequency Measurement (IFM) devices are the essential parts of anyESM, ELINT, and RWR receiver. Analog IFMs have been used for several decades. However, thesedevices are bulky, complex and expensive. Nowadays, there is a great interest in developing a wideband, high dynamic range, and accurate Digital IFMs. One Digital IFM that has suitably reached allthese requirements is mono-bi...

Digital modulation signal instantaneous characteristics are susceptible to noise interference, and instantaneous frequency extraction is easy to be folded and distorted. In this paper, a novel digital signal modulation mode identification algorithm under low SNR is proposed. In the algorithm, empirical mode decomposition (EMD) has been employed to extract signal instantaneous characteristics fi...

in this paper some new applications of empirical mode decomposition (emd) and hilbert spectrum in seismic ground-roll attenuation, random noise attenuation and spectral decomposition are introduced. hilbert spectrum is a time-frequency representation for hilbert-huang transform which is obtained by combination of instantaneous frequency (if) concept and intrinsic mode function of empirical mode...

The paper describes algorithms for the classification of digital modulations and estimation of symbol length. ASK, FSK2, FSK4, MSK, BPSK, QPSK, 8PSK and QAM-16 were chosen for recognition as the best-known digital modulations used in modern communication technologies. The first algorithm is based on module and phase spectrogram analysis, the second algorithm uses instantaneous values of signal ...

In modern information and sensor systems the timely estimation of the carrier frequency of received signals is of critical importance. This paper presents the Digital Instantaneous Frequency Measurement (DIFM) technique, which can measure the carrier frequency of a received waveform within a fraction of a microsecond. The resulting frequency range, resolution and accuracy of the system are scal...

This paper discusses practical constraints of Error Vector Magnitude (EVM) measurements for high-coverage Radio Frequency Integrated Circuit (RFIC) device testing. Noise, distortion, spurious signals, and phase noise all degrade EVM, and therefore EVM provides a comprehensive measure of an RFIC’s quality of use in digital communications. New wireless standards with large instantaneous bandwidth...

We present analytical results characterizing the e ects of multipath interference on an FM subcarrier data channel. A closed form expression for the FM discriminator output (or the instantaneous received frequency) is obtained when there are M re ected path signals in addition to the primary path signal. We derive the power spectral density when the multipath interference is weak, and determine...