time-frequency spectrum estimation
Time-Delay Estimation in Dispersed Spectrum Cognitive Radio Systems
... are identical in this scenario, they are referred to as “selection combining” in the figure. It is observed from Figure 7 that the optimal combining has better performance than the selection combining and the equal ...
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Time Frequency Spectrum Sharing Scheme for Next Generation OFDM Systems
... 3.1. Channel Information. In order to be aware of the phys- ical conditions in the perspective of the resource allocation scheme, there is a need to exploit some channel parameters reflecting the channel quality of each ...
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A New Approach for Estimation of Instantaneous Mean Frequency of a Time-Varying Signal
... instantaneous frequency (IF) of a signal is a param- eter of practical importance in situations such as seis- mic, radar, sonar, communications, and biomedical appli- cations [1, 2, 3, ...induced frequency ...
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Robust Blind Frequency and Transition Time Estimation for Frequency Hopping Systems
... spread spectrum (FHSS) techniques are widely used in military communications for combating narrowband interference and for security ...the estimation in FHSS are transition time and hopping ...
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Selection of Effective EEG Band for Estimation of Cognitive State while Listening Music
... The frequency spectrum of a signal is basically the frequency components (spectral components) of that ...Among frequency analysis techniques, Fourier transform is considered to be the best ...
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A High Resolution Method for Acoustic Localization in Far field Based on Sliding DFT Algorithm
... the time delay estimation and orientation localization, in this paper, we are aimed at finding a high resolution algorithm to improve the deviation in the far-field source ...novel time delay ...
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Maximum-Likelihood Estimation of Demographic Parameters Using the Frequency Spectrum of Unlinked Single-Nucleotide Polymorphisms
... Figure 2.—Power to detect growth with ⵑ500 unlinked sites. The num- ber of sites used for each point in a curve is scaled on the basis of 500 sites in a sample size of 20. (a) Effect of sample size on power to detect re- ...
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Spatial polarimetric time frequency distribution based DOA estimation: combining ESPRIT with MUSIC
... Spatial spectrum estimation technology has always been the focused research project in an array signal processing of High Frequency Surface Wave Radar ...with time-frequency analysis ...
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Carrier Frequency Offset Estimation for OFDM Systems Using Time/Frequency-Domain Techniques
... the spectrum much more efficiently by spacing the channels much ...to frequency synchronization problem. In this paper focus is on frequency offset, which may be caused by Doppler shift in the ...
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Cognitive Radio The New Paradigm in the History Of Wireless Communication
... Spectrum Sensing A major challenge in cognitive radio is that the secondary users need to detect the presence of primary users in a licensed spectrum and quit the frequency band as quickly as ...
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Estimation of Time-Scaling Factor for Ultrasound Medical Images Using the Hilbert Transform
... signal spectrum is plotted with the Gaussian spectrum used for simulation, see Figure ...high time-scaling fac- tor to estimate, a high number of iterations can be necessary to converge through the ...
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Heart Rate Variability Characterization Using a Time-Frequency Based Instantaneous Frequency Estimation Technique
... the time or frequency domain ...the spectrum. The different frequency bands (LF, MF and HF) are clearly separated and their time-varying nature clearly ...
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Auditory Spectrum-Based Pitched Instrument Onset Detection
... constant-Q spectrum in order to find the best fitting fundamental ...pitch estimation was introduced in [7], which utilizes an energy descriptor for detecting hard onsets and a pitch descriptor for ...
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Low-frequency estimation of continuous-time moving average Lévy processes
... stochastic processes including semimartingales and non-semimartingales, cf. Basse and Pedersen [1], Basse-O’Connor and Rosinsky [2], Bender, Lindner and Schicks [3], as well as long-memory processes. Starting point was ...
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Discrete Time Frequency Signal Analysis and Processing Techniques for Non Stationary Signals
... in time-frequency analysis, due to their simplicity in usage, well-established algorithm and analysis technique ...hanced time-frequency resolution QTFDs have been ...or time-varying ...
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Frequency Estimation Using Time-Frequency Based Methods
... amplitude, frequency, phase, and the variability of its instantaneous spectral ...existing frequency estimation techniques and proposes a new technique for estimating the instantaneous ...
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Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... high frequency communication is selectively fading be- cause of the multi-path propagation and abundance of interference from the ...Every frequency channel due to interferences and fading shows different ...
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Performance evaluation of MIMO OFDM implementation on Wireless Open Access Research Platform (WARP)
... orthogonal frequency division multiplexing (OFDM) technique, is two candidate techniques that are suitable for use on high-speed data transmission in the ...of frequency selective fading and using ...
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Spatial time frequency distribution of cross term based direction of arrival estimation for weak non stationary signal
... the time- frequency distributions of the source signals was con- sidered by Belouchrani et ...quadratic time-frequency distribution matrices corresponding merely to the named cross terms ...
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DOA Estimation Using Time-Frequency Conversion Pre-Processing Method
... DOA estimation by applying the wavelet transform method into several subbands MUSIC scenarios ...DOA estimation algorithm using a time-frequency conversion pre-processing method with a signal ...
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