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The Wigner-Ville Hough transform (WVHT) has been applied to detect and estimate the parameters of linear frequency-modulated continuous-wave (LFMCW) low probability of intercept (LPI) radar waveforms. The WVHT, which is optimal for a single linear frequency modulated (LFM) signal, becomes sub-optimal when applied to LFMCW signals since the observed waveform is composed of concatenated LFM pulses....
A novel distributed localization method for wireless sensor networks (WSN) is proposed in this paper. Linear frequency modulation (LFM) waves are emitted from two anchors simultaneously to create an interference field. Through the frequency measurement of local RSSI (Received Signal Strength Indication) signal, the TDoA (Time-Difference-of-Arrival) is estimated independently at each sensor to detect...
This paper investigates the non-data-aided SNR estimation techniques for analog modulation signals. Two existing algorithms, M2M4 and ED-based estimators, are modified and applied to SNR estimation for signals with analog modulation. This paper also proposes a simple but practical Spectrum-based SNR estimator for analog modulation. The performances of the three SNR estimators are compared and analyzed.
A novel distributed TDoA (Time-Difference-of-Arrival) estimation method for wireless sensor networks (WSN) is proposed in this letter. Linear frequency modulation (LFM) waves are emitted from two anchors simultaneously to create an interference field. Through the frequency measurement of local RSSI (Received Signal Strength Indication) signal, the TDoA is estimated independently at each sensor to...
In this paper, a new blind carrier frequency and phase offset detector, and modulation order identifier are presented for phase shift keying (PSK) signals. These operations are intermediate steps between signal detection and demodulation, and play a key role in various military and non- military applications. As compared with previous related approaches, the proposed algorithm provides a fully blind...
Both ionospheric slow phase-path disturbance and targets' maneuver will make the targets' echoes broaden in HF radar. Although their mechanism to spread the spectra is different, they are consistent on the view of the phase of targets' echoes. Using the algorithm of ionospheric disturbance decontamination which has been successfully applied in practice, a method for recovering maneuver targets spectra...
This paper provides a detailed analysis of a recently proposed algorithm for efficient frequency estimation and tracking. A correlation based Pulse-Pair (PP) method, which is an efficient technique for frequency estimation, is used for the frequency tracking. It is known that the PP method has a very low number of multiplications, but, has the disadvantage of requiring inverse tan operations in its...
SNR estimation of LFM signal detection is often applied in radar, mobile communications, Radiolocation and seismic exploration with vibrator. The common method of LFM signal detection is correlation, which can not only be used to explain time delay in Multipath Propagation, but also to estimate SNR in detection of output signal. The records of signal plus noise before the signal detection are called...
The aim of this paper is the detection and parameter estimation for multicomponent linear frequency modulation (LFM) signals based on Hilbert-Huang Hough transform of the signals. The proposed method iteratively decomposes the multicomponent LFM signals into monocomponent LFM signals and applies Hilbert-Huang Hough transform to each LFM component, which is a mapping from the time domain to the parameter...
This paper have focused on the parameter estimation for multicomponent linear frequency modulation (LFM) signals using EMD based fractional Fourier transform. The proposed method iteratively decomposes the multicomponent LFM signals into monocomponent LFM signals and applies fractional Fourier transform (FRFT) to each LFM component, which is a mapping from the time domain to the fractional Fourier...
The aim of this work is the performance evaluation for a method used to analyze of a mono-component linear frequency modulation (LFM) signal, based on the quadratic phase function of the signal. A closed form is found for the output signal to noise ratio. The parameter selection problems of the algorithm are also discussed. Thresholds of the input SNR are presented to guarantee a reasonably accurate...
Detection performance of a complex linear FM signal from a finite number of noisy discrete-time observations is discussed. The computation method of spectrum peak SNR is given. The detector statistic based spectrum peak SNR is constructed and the probability density functions (PDF) of spectrum peak SNR under the 'noise-only' hypothesis and the 'noise-and-signal' hypothesis are examined respectively...
Estimation of the instantaneous frequency (IF) of nonlinear FM signals with additive Gaussian noise is considered. An algorithm for the IF estimation is proposed based on Wigner-Ville distribution (WVD) maxima and local singular value decomposition (SVD).Simulation result shows that the proposed method is valid for nonlinear FM signals.
In this paper, we present a comparison of two strategies for FMCW radars. The potential presence of multiple targets implies using specific waveforms for beat frequencies association. Here, we compare performance of two such waveforms in terms of targets distance and velocity estimation. Our comparison, based on theoretical bounds derivation is validated by Monte Carlo simulations. In particular we...
This paper proposed a method to estimate sub-carriers frequencies of multi-carrier CDMA signals utilizing higher-order cyclic cumulants, based on the cyclic stationary characteristic of multi-carrier CDMA signals. Because higher-order cyclic cumulants can effectively suppress stationary noise and non-stationary Gaussian noise, through theoretical analysis, we can prove that the higher-order cyclic...
For a high-order polynomial-phase signal (PPS), instantaneous frequency rate (IFR), which is defined as the second derivative of the phase, is estimated by using an estimator with only a second-order nonlinearity. Compared to high-order phase function (HPF), the proposed IFR estimator presents improved performance including smaller mean-squared error (MSE) and lower SNR threshold. Statistical analysis...
In this paper we present methods enabling the analysis and detection of the Universal Mobile Telecommunications System (UMTS) signals. Presented procedures enable estimation of the basic parameters of the signal, identification of the standard and provide knowledge concerning essential information about the transmitted signal. Efficiency tests of proposed method of analysis are also introduced in...
This paper deals with the design and implementation of an algorithm for non-data aided carrier offset compensation in a QPSK communication system. The work concentrates on frequency synchronization and we propose a new modulation removal algorithm where the carrier offset is corrected in two steps, reducing the computational complexity. Moreover, a FPGA-accelerated implementation is introduced. Initial...
In this paper, an integrated cubic phase function (ICPF) for parameter estimation of linear frequency-modulated (LFM) signals is introduced. The ICPF extends the standard cubic phase function (CPF) and provides improved estimation performances in cases involving low signal-to-noise ratio (SNR) and multi-component LFM signals, at the cost moderately increased complexity. The asymptotic bias and mean...
A novel algorithm for the direction of arrival (DOA) estimation based on the fractional Fourier transform (FRFT) is proposed. Multi-component LFM signals are filtered and demodulated into a number of stationary single frequency signals. Then the direction estimation of LFM signals can be achieved by combining with the traditional MUSIC method in the fractional Fourier (FRF) domain. The statistical...
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