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An Effective Adaptive Threshold Based Compressive Spectrum Sensing in Cognitive Radio Networks

S. Varalakshmi, K. Senthil Kumar, A. K. Gnanasekar, S. Sureshkrishna
2021 Information Technology in Industry  
In this technique compressed signal is sensed without any reconstruction of the signal.  ...  To conquer this problem, noise variance is estimated using parametric estimation technique and the threshold is varied adaptively.  ...  In this adaptive sensing technique, the probability of detection is improved in the low SNR region compared to other two techniques.  ... 
doi:10.17762/itii.v9i1.260 fatcat:we34wun3rfg7jbiaowttjgkyiy

A noise reduction system based on hybrid noise estimation technique and post-filtering in arbitrary noise environments

Junfeng Li, Masato Akagi
2006 Speech Communication  
An estimator for the a priori speech absence probability is derived from the coherence characteristic of the noise field at spectral subtraction output, improving the spectral enhancement of the desired  ...  Experimental results demonstrated that the hybrid estimation technique produces more accurate spectral estimates for localized noises and the proposed noise reduction system results in significant improvements  ...  Takeshi Saitou for his help in the listening tests.  ... 
doi:10.1016/j.specom.2005.06.013 fatcat:b5z2rcaxnvhznbq5genaec763u

Performance of Threshold Detection in Cognitive Radio with Improved Otsu's and Recursive One-Sided Hypothesis Testing Technique

2019 VOLUME-8 ISSUE-10, AUGUST 2019, REGULAR ISSUE  
In this paper, for efficient threshold estimation, the improved Otsu and ROHT are combined for estimating threshold even in the presence of noise floor without need of prior knowledge.  ...  A prominent example of an Adaptive Threshold Estimation Technique (ATT) for energy detection in Cognitive Radio (CR) is the Recursive One-sided Hypothesis Testing Technique (ROHT).  ...  ACKNOWLEDGMENT Authors would like to express sincere gratitude to management and principal of KLEF, Vijayawada, Andhra Pradesh, India, for their support and encouragement to carry out the research work  ... 
doi:10.35940/ijitee.i3063.0789s319 fatcat:52jx2kzmfvhufiku46v2xvwcwi

Antijamming Performance of Adaptive Chaos Based CDMA System with MRC in Imperfect Channel Estimation Environment

Meher Krishna Patel, Stevan M. Berber, Kevin W. Sowerby
2017 Wireless Communications and Mobile Computing  
Under the perfect synchronization conditions, probability of error in closed form is derived.  ...  Pilot symbols are used to estimate the fading coefficients using least mean square (LMS) algorithm, and effect of imperfect channel estimation on bit error rate (BER) is studied.  ...  Since all the received signals should be in same phase for MRC; therefore, channel estimators play important role in MRC technique.  ... 
doi:10.1155/2017/2716949 fatcat:67l7dryiurd4vjktoowajtver4

Speech enhancement using modified wiener filter based MMSE and speech presence probability estimation

V. Vijayasari Bolisetty, U. Yedukondalu, I. Santiprabha
2020 International Journal of Informatics and Communication Technology (IJ-ICT)  
In next phase, MMSE technique is applied where Gaussian distribution of each signal i.e. original and noisy signal is analyzed.  ...  The Gaussian distribution provides spectrum estimation and spectral coefficient parameters which can be used for probabilistic model formulation.  ...  estimated and reduced to improve the speech quality. During last decade, various enhancement techniques have been presented for speech signal enhancement.  ... 
doi:10.11591/ijict.v9i2.pp63-72 fatcat:ektbbqodbrbl3mxkcwmjderlei

A Novel Algorithm to Improve Resolution for Very Few Samples

Sidi Mohamed, Samir Kameche
2017 International Journal of Advanced Computer Science and Applications  
This paper presents a new technic to improve resolution and direction of arrival (DOA) estimation of two closed source, in array processing, when only few samples of received signal are available.  ...  It combines spatial smooth method to widen the spatial resolution, bootstrap technique to estimate increased sample size, and a high resolution technique which is Multiple Signal Classification (MUSIC)  ...  Multiple Signal Classification (MUSIC) or Estimation of Signal Parameter via Rotational Invariance Technique (ESPRIT), and detect sources using eigenvalues obtained from covariance matrix of samples.  ... 
doi:10.14569/ijacsa.2017.081041 fatcat:kvbpvkhlarevjl3fdriqr32vwe

Signal probability based statistical timing analysis

Bao Liu
2008 Proceedings of the conference on Design, automation and test in Europe - DATE '08  
Leveraging with existing power estimation techniques, I propose signal probability (i.e., the logic one occurrence probability on a net) based statistical timing analysis, for improved accuracy and reduced  ...  Power estimation techniques are categorized as (1) static, (2) statistical, and (3) simulation and testing based methods.  ...  For efficiency improvement over Monte Carlo (SPICE) simulation, I resort to probabilistic techniques in power estimation literature, e.g., circuit switching activity estimation based on signal probability  ... 
doi:10.1145/1403375.1403513 fatcat:rtfukmb4fjfihbhy2sxoamzjru

Signal Probability Based Statistical Timing Analysis

Bao Liu
2008 2008 Design, Automation and Test in Europe  
Leveraging with existing power estimation techniques, I propose signal probability (i.e., the logic one occurrence probability on a net) based statistical timing analysis, for improved accuracy and reduced  ...  Power estimation techniques are categorized as (1) static, (2) statistical, and (3) simulation and testing based methods.  ...  For efficiency improvement over Monte Carlo (SPICE) simulation, I resort to probabilistic techniques in power estimation literature, e.g., circuit switching activity estimation based on signal probability  ... 
doi:10.1109/date.2008.4484736 dblp:conf/date/Liu08 fatcat:e6mtcyd5s5d7zhfhutreoatpci

BER Improvement Using Error Concealment Technique for Pulse Code Modulation System

Ahmed Mohammed Ahmed
2018 Diyala Journal of Engineering Sciences  
The output of pulse code modulation (PCM) encoder is statistically described; this description is used at the receiver to reduce the error of the received signal.  ...  The results show that a significant improvement gained in bit error rate that was reduced from 0.078 to 0.052 at 0 dB of Eb N0⁄ by soft decoding, compared to hard decoding.  ...  the transmitted encoded symbol; MAP estimator is selected because it minimizes the probability error for the decoded symbol.  ... 
doi:10.24237/djes.2018.11110 fatcat:qkdb72d4trdv3hvvhapvwbv4hm

Estimation of speech absence uncertainty based on multiple linear regression analysis for speech enhancement

Jihwan Park, Jong-Woong Kim, Joon-Hyuk Chang, Yu Gwang Jin, Nam Soo Kim
2015 Applied Acoustics  
We propose a novel approach to improve the performance of speech enhancement systems by using multiple linear regression to improve the technique of estimating the speech presence uncertainty.  ...  Conventional speech enhancement techniques use a fixed ratio Q of the a priori probability of speech presence and speech absence, or determine the value of Q simply by comparing one particular parameter  ...  a b s t r a c t We propose a novel approach to improve the performance of speech enhancement systems by using multiple linear regression to improve the technique of estimating the speech presence uncertainty  ... 
doi:10.1016/j.apacoust.2014.06.017 fatcat:rt7qdlsjwfd7jj7uw5ty7l2zb4

Modification of the robust chirp-rate estimator for impulse noise environments

Igor Djurović, Pu Wang, Cornel Ioana
2010 Signal Processing  
In this approach, robust filtering of the polynomial-phase signals (PPS) is performed in an initial stage followed by the standard chirp-rate estimation for filtered signal.  ...  A modification of the robust chirp-rate estimator is proposed. The proposed technique has large breakdown point resulting in robustness to high amount of the impulse noise.  ...  The accuracy improvement can be observed with respect to both the standard CPF and the robust CPF where estimation function is calculated for auto-correlation of the signal.  ... 
doi:10.1016/j.sigpro.2009.10.022 fatcat:zt3n4726rrfkbpuvsqcck2l66m

155.pdf

SHAIK AZEEZ
2021 figshare.com  
achieved Better BER, signal to noise ration, and detection probability.  ...  Therefore least square error and symmetry correction techniques are implemented for balancing the uncertainty of acoustic signals.  ... 
doi:10.6084/m9.figshare.14685609.v1 fatcat:3dycvyuzzzh25podwcui3zmzqu

A new DOA estimation technique based on subarray beamforming

Nanyan Wang, P. Agathoklis, A. Antoniou
2006 IEEE Transactions on Signal Processing  
Performance analysis and extensive simulations show that the proposed technique offers significantly improved estimation resolution, capacity, and accuracy relative to existing techniques.  ...  A new direction-of-arrival (DOA) estimation technique using subarray beamforming is proposed.  ...  ACKNOWLEDGMENT The authors wish to thank the reviewers for helpful comments and suggestions.  ... 
doi:10.1109/tsp.2006.877653 fatcat:hq56ysa2afdmzirrfr7tl3enra

DTCWT-ICA based Improved DOA Estimation of Closely Spaced and Coherent Signals with Uniform Linear Array

Dharmendra Ganage, Sinhgad College of Engineering, Yerram Ravinder, Pune Institute of Computer Technology
2019 International Journal of Intelligent Engineering and Systems  
MUSIC algorithm is best suited for estimating the non-coherent signals due to its accuracy and a high degree of resolution.  ...  Direction of Arrival (DOA) estimation is the important stage in a smart antenna that estimates the direction of impinging signals on an antenna array, and the most high-resolution DOA estimation subspace  ...  exploiting high probability failure of DOA estimation for coherent signals.  ... 
doi:10.22266/ijies2019.0228.29 fatcat:244f63xh6nhurgbvhmrhbrs7gy

Estimation and optimization of reliability of noisy digital circuits

Satish Sivaswamy, Kia Bazargan, Marc Riedel
2009 2009 10th International Symposium on Quality of Electronic Design  
The challenge stems in part from the lack of computationally efficient techniques for analyzing and optimizing circuits for reliability.  ...  Also, we propose a hybrid method that combines exact analysis with probabilistic measures to estimate reliability.  ...  the analysis, probabilistic techniques have been widely used to estimate signal probabilities.  ... 
doi:10.1109/isqed.2009.4810296 dblp:conf/isqed/SivaswamyBR09 fatcat:5z3yoxqhgbeatacw2zmeqfhuq4
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