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Diversity and channel estimation using time-varying signals and time-frequency techniques

Hao Shen, A. Papandreou-Suppappola
2006 IEEE Transactions on Signal Processing  
The proposed algorithm simplifies to the estimation of the parameters of multiple linear chirps, which we perform using the modified matching pursuit decomposition.  ...  We also derive conditions on the parameters of the modulation signals to achieve multipath diversity.  ...  ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their useful comments which improved this paper.  ... 
doi:10.1109/tsp.2006.877665 fatcat:jq77fot6q5csjets6xtgzrmp7q

Matched Filter Implementation, Complexity, and Gain in Fractional Fourier Domain

Sherif A. Elgamel
2021 Advances in Military Technology  
The complexity of the FrFD matched filter over the normal frequency transform matched filter is also investigated.  ...  The performance enhancements for using the matched filter in the FrFD are presented and the enhancement in the signal to noise ratio (SNR) output at different target SNRs are also described.  ...  the transmitting signal parameters (known signal parameters), the optimum fractional order is estimated to transform the received signal to the optimum FrFD, • FrFT of the received signal: the optimum  ... 
doi:10.3849/aimt.01513 fatcat:pskfe7fi2bhv3m62an5uhpcwdu

Discrete chirp-Fourier transform and its application to chirp rate estimation

Xiang-Gen Xia
2000 IEEE Transactions on Signal Processing  
Besides the multiple frequency matching similar to the DFT, the DCFT can be used to match the multiple chirp rates in a chirp-type signal with multiple chirp components.  ...  We show that when the signal length is prime, the magnitudes of all the sidelobes of the DCFT of a quadratic chirp signal are 1, whereas the magnitude of the mainlobe of the DCFT is .  ...  For chirp-type signals, besides frequencies of multiple harmonics, there are chirp rates of multiple chirps, and the DFT can be used only to match the multiple frequencies, but the multiple chirps, in  ... 
doi:10.1109/78.875469 fatcat:fvkyhz74uzei7ll7gd6i6ebb3m

Joint Model Order Selection and Parameter Estimation of Chirps With Harmonic Components

Yaron Doweck, Alon Amar, Israel Cohen
2015 IEEE Transactions on Signal Processing  
We consider the problem of jointly determining the number of harmonic components of a fundamental linear chirp, and estimating its parameters (i.e., its initial frequency and frequency rate), given time  ...  samples of the observed signal.  ...  ACKNOWLEDGMENT The authors would like to thank the associate editor and the anonymous reviewers for their insightful and constructive comments which helped to improve and clarify the paper.  ... 
doi:10.1109/tsp.2015.2391075 fatcat:voc6f2gxxrfptbdv67yqk7fprm

Parameter estimation of linear and quadratic chirps by employing the fractional fourier transform and a generalized time frequency transform

SHISHIR B SAHAY, T MEGHASYAM, RAHUL K ROY, GAURAV POONIWALA, SASANK CHILAMKURTHY, VIKRAM GADRE
2015 Sadhana (Bangalore)  
The time shift property of the GTFT is discussed. The paper describes methods for estimation of parameters of individual chirp signals on receipt of a noisy mixture of chirps.  ...  A priori knowledge of the nature of chirp signals in the mixture -linear or quadratic is required, as the two proposed methods fall in the category of model-dependent methods for chirp parameter estimation  ...  Parameter estimation of chirp signals normally involves estimation of the unknown relationship between IF and time.  ... 
doi:10.1007/s12046-015-0380-8 fatcat:u2osxmx7yffadal4f25vbbcv3q

MMSE estimation of nonlinear parameters of multiple linear/quadratic chirps

Hsiang-Tsun Li, P.M. Djurie
1998 IEEE Transactions on Signal Processing  
An iterative algorithm similar to our MMSE estimation procedure proposed in another paper by the authors is applied to parameter estimation of multiple superimposed chirp signals in white Gaussian noise  ...  The necessary parameter initializations of the procedure are accomplished by peak detections in the Choi-Williams time-frequency distribution of the data followed by application of the least-squares principle  ...  MMSE Estimation of Nonlinear Parameters of Multiple Linear/Quadratic Chirps I. INTRODUCTION Chirp signals are frequently encountered in many scientific and engineering areas.  ... 
doi:10.1109/78.661350 fatcat:6n25dysvt5g6jbgrgwqs6aivoq

Estimating the Parameters of Multiple Wideband Polynomial-Phase Signals in Sensor Arrays using Spatial Time-Frequency Distributions

Aboulnasr Hassanien, Alex B. Gershman, Kon Max Wong
2007 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07  
A new algorithm for estimating the parameters of multiple wideband polynomial-phase signals (PPSs) in sensor arrays is developed.  ...  Then, the properties of SHIMs of multiple wideband PPSs are employed to obtain recursive estimates of the PPS frequency parameters.  ...  CONCLUSIONS A new algorithm to estimate the parameters of multiple wideband polynomial-phase signals in sensor arrays is proposed.  ... 
doi:10.1109/icassp.2007.366424 dblp:conf/icassp/HassanienGW07 fatcat:sj3zrjalajcwhim7rno7rmvuz4

A New Diversity Combining Scheme Based on Interleaving Method for Time-of-arrival Estimation of Chirp Signal

Seong-Hyun Jang, Jong-Wha Chong
2012 Journal of IKEEE  
A new diversity combining scheme is proposed for time-of-arrival (TOA) estimation of chirp signal in dense multipath channel.  ...  To increase the de-correlation effect, the proposed diversity scheme employs interleaving method based on the property of de-chirped signal.  ...  Specifically, the chirp signals can be used with subspace-based super resolution (SBSR) algorithm such as multiple signal classification (MUSIC) [6] and estimation of signal parameters via rotational  ... 
doi:10.7471/ikeee.2012.16.2.153 fatcat:pn2szudb2jejzluxp66l6u5ypy

Using edge information in time–frequency representations for chirp parameter estimation

Nicholas N. Bennett, Naoki Saito
2005 Applied and Computational Harmonic Analysis  
In particular, we show that using the edge information: (1) reduces the variance of the chirp parameter estimates in the case where the chirp signal has a single component; and (2) reduces the amount of  ...  Time-frequency representations of a signal can provide a useful means for obtaining parameter estimates for signals consisting of various chirps.  ...  and (2) reduces the amount of spurious cross talk results when the signal has multiple chirp components.  ... 
doi:10.1016/j.acha.2004.11.002 fatcat:cmqo2a4kmvcr5ku6piuaeigjdq

A novel parameter estimation of chirp signal in α-stable noise

Xuelian Liu, Chunyang Wang
2017 IEICE Electronics Express  
So it is difficult to accurately estimate the parameters of chirp signal in α-stable noise. In addressing this problem, a novel method of accurate parameter estimation of chirp signal is proposed.  ...  The proposed method can effectively estimate the initial frequency and chirp rate of the chirp signal in α-stable noise.  ...  Because the chirp signal has a low probability of intercept [3] , the study on chirp signal detection and parameters estimation has aroused general concern.  ... 
doi:10.1587/elex.14.20161053 fatcat:pqfyfs4nizaghecardfpov2zbe

PARAMETER ESTIMATION OF CHIRP SIGNAL USING STFT

Mary Deepthi Joseph, Gnana Sheela
2017 Zenodo  
STFT is one of the time-frequency method and it is a valuable tool for estimating the parameters like start frequency, end frequency, band width, pulse width and chirp rate of chirp signal.  ...  This paper suggested a technique called short time Fourier transform (STFT) for the parameter estimation of chirp signal in intercept SONAR.  ...  Hence the different parameters of chirp signal are estimated at SNR= -3dB.  ... 
doi:10.5281/zenodo.3958645 fatcat:rf4mbml4b5abhf4wj4tjw6npmy

Separation and localization of multiple distributed wideband chirps using the fractional Fourier transform

Jiexiao Yu, Liang Zhang, Kaihua Liu, Deliang Liu
2015 EURASIP Journal on Wireless Communications and Networking  
In this paper, we consider the problem of localizing the multiple distributed wideband chirp sources using the fractional Fourier transform.  ...  A novel direction of arrival (DOA) estimation algorithm in the Dechirping domain is proposed, which is extended from the conventional multiple signal classification (MUSIC) algorithm in the time domain  ...  Acknowledgements This work is funded by the National Natural Science Fund of China (No. 61501322).  ... 
doi:10.1186/s13638-015-0497-9 fatcat:f6v2jrj2tbg57gmhul5aixh2le

Chirplet Signal and Empirical Mode Decompositions of Ultrasonic Signals for Echo Detection and Estimation

Yufeng Lu, Erdal Oruklu, Jafar Saniie
2013 Journal of Signal and Information Processing  
In case of signals consisting of multiple interfering chirplets, the CSD algorithm, based on successive search for estimating optimal chirplet parameters, outperforms the EMD algorithm which estimates  ...  In particular, we have utilized the EMD as a signal conditioning method for Hilbert time-frequency representation in order to estimate the arrival time and center frequency of chirplets in order to quantify  ...  Similarly, a signal consisting of multiple chirp echoes can be simulated and decomposed using EMD.  ... 
doi:10.4236/jsip.2013.42022 fatcat:ubndaq3bqbhlxb3436waa4taya

Joint Estimation of Time-Frequency Signature and DOA Based on STFD for Multicomponent Chirp Signals

Ziyue Zhao, Congfeng Liu
2014 International Scholarly Research Notices  
In the study of the joint estimation of time-frequency signature and direction of arrival (DOA) for multicomponent chirp signals, an estimation method based on spatial time-frequency distributions (STFDs  ...  According to the results of the array processing, Hough transform is performed and the estimation of time-frequency signature is obtained.  ...  Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper.  ... 
doi:10.1155/2014/937139 pmid:27382610 pmcid:PMC4897410 fatcat:qtvsxsixbralrbvsyuy2dfm4hi

Estimation of Time-varying Communication Channels Using Reduced Length Chirp Pilots

Seda Senay, Electrical Engineering Department New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
2018 Journal of Communications  
The transmission of two consecutive chirps with different rates as a pilot sequence is a method that has been used for the estimation of linear time-varying (LTV) channel parameters.  ...  In this paper, we propose an improvement on the chirp-based channel estimation method for an LTV model.  ...  The application of chirp signals in parameter estimation of time-varying communication channels is not a new approach; chirps have also been used in sonar and radar systems [6] [7] [8] [9] [10] [11] .  ... 
doi:10.12720/jcm.13.3.114-118 fatcat:bf2vibtqsvapjkqedxzhhvbtpe
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