ESTIMATION OF THE MESSAGE TRANSMISSION PROBABILITY IN CHANNELS WITH ERRORS PACKETS

2021 ◽  
Author(s):  
М.Л. МАСЛАКОВ ◽  
С.А. КУДРЯШОВА
Keyword(s):  
Numerical Simulation ◽  
Error Rate ◽  
Transmission Probability ◽  
Message Transmission ◽  
Discrete Channel

Рассмотрена передача сообщений в каналах с пачками ошибок. Реализована модель дискретного канала с формированием как одиночных, так и пачек ошибок с заданной вероятностью. Модель позволяет получить оценки вероятности потери сообщений для различных условий. Представлены результаты моделирования. The paper deals with the transmission of messages over channels with error packets. A model of a discrete channel has been designed with the formation of both single errors and packets of errors with a given probability. The model provides estimates of the message error rate for various conditions. The results of the numerical simulation are presented.

scholarly journals THE REDUCTION OF PAPR IN OFDM BY USING NEW COMPANDING TRANSFORM

2014 ◽  
pp. 1-3
Author(s):  
T. NAGARAJU ◽  
K. RAMANAIDU
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Bit Error Rate ◽  
Error Rate ◽  
Average Power ◽  
High Peak ◽  
Papr Reduction ◽  
Power Ratio ◽  
Main Drawback ◽  
Reduction Techniques

The main drawback of the OFDM is its high peak to average power ratio(PAPR).There are several PAPR reduction techniques. Among the various PAPR reduction techniques, companding transform is attractive for its simplicity and effectiveness. This paper proposes a new companding algorithm. The proposed algorithm offers an improved bit error rate and minimized out-of-band interference while reducing PAPR effectively, compared with the others. Theoretical analysis and numerical simulation are presented.

Simulated Study for OOK Modulation in the Mud Pulse Telemetry

2015 ◽  
Vol 727-728 ◽  
pp. 809-812
Author(s):  
Bo Qin Xu ◽  
Zhu Jun Zhang ◽  
Jun Wei Hu
Keyword(s):  
Numerical Simulation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Pressure Wave ◽  
Signal To Noise Ratio ◽  
Signal Amplitude ◽  
Modulation Scheme ◽  
Drilling Process ◽  
Signal To Noise ◽  
Process Pressure

Mud pulse telemetry (MPT) transmits data from borehole to surface during the drilling process. Pressure wave is generated in the drilling channel and is used as carrier of the downhole data. Through numerical simulation, this paper analyzes the bit error rate (BER) of mud pulse telemetry under different signal to noise ratio (SNR) based on on-off keying (OOK) modulation scheme. By observing the effect of waveform error on BER, the allowed variation ranges in signal amplitude and period are obtained.

scholarly journals Optical Orbital Angular Momentum Demultiplexing and Channel Equalization by Using Equalizing Dammann Vortex Grating

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Mingyang Su ◽  
Junmin Liu ◽  
Yanliang He ◽  
Shuqing Chen ◽  
Ying Li
Keyword(s):  
Numerical Simulation ◽  
Angular Momentum ◽  
Light Intensity ◽  
Diffraction Efficiency ◽  
Orbital Angular Momentum ◽  
Bit Error Rate ◽  
Error Rate ◽  
Channel Equalization ◽  
Grating Structure

A novel equalizing Dammann vortex grating (EDVG) is proposed as orbital angular momentum (OAM) multiplexer to realize OAM signal demultiplexing and channel equalization. The EDVG is designed by suppressing odd diffraction orders and adjusting the grating structure. The light intensity of diffraction is subsequently distributed evenly in the diffraction orders, and the total diffraction efficiency can be improved from 53.22% to 82%. By using the EDVG, OAM demultiplexing and channel equalization can be realized. Numerical simulation shows that the bit error rate (BER) of each OAM channel can decrease to 10-4 when the bit SNR is 22 dB, and the intensity is distributed over the necessary order of diffraction evenly.

scholarly journals A NUMERICAL SIMULATION OF THE COVID-19 EPIDEMIC IN ARGENTINA USING THE SEIR MODEL

2021 ◽  
Vol 51 (3) ◽  
pp. 179-184
Author(s):  
Patricia Gauzellino ◽  
Gabriela Savioli ◽  
José Carcione ◽  
Juan Santos ◽  
Alejandro Ravecca ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Buenos Aires ◽  
Transmission Probability ◽  
Control Measures ◽  
Model Parameters ◽  
Fatality Rate ◽  
Reproduction Ratio ◽  
Disease Evolution ◽  
Seir Model ◽  
Rate Transmission

A pandemic caused by a new corona virus has spread worldwide, affecting Argentina. We implement an SEIR model to analyze the disease evolution in Buenos Aires and neighboring cities.The model parameters are calibrated using the number of casualties officially reported. Since infinite solutions honor the data, we show different cases. In all of them the reproduction ratio R0 decreasesafter early lockdown, but then raises, probably due to an increase in the community circulation of the virus. Therefore it is mandatory to reverse this growing trend in R0 by applying control strategiesto avoid a high number of infectious and dead individuals. The model provides an effective procedure to estimate epidemic parameters (fatality rate, transmission probability, infection and incubationperiods) and monitor control measures during the epidemic evolution.

Perceptual Characteristics of Consonant Production in Apraxia of Speech and Aphasia

2019 ◽  
Vol 28 (4) ◽  
pp. 1411-1431 ◽  
Author(s):  
Lauren Bislick ◽  
William D. Hula
Keyword(s):  
Error Rate ◽  
Error Rates ◽  
Group Differences ◽  
Diagnostic Process ◽  
Apraxia Of Speech ◽  
Contextual Variables ◽  
Error Type ◽  
Type Distribution ◽  
Phonetic Features ◽  
Syllable Position

Purpose This retrospective analysis examined group differences in error rate across 4 contextual variables (clusters vs. singletons, syllable position, number of syllables, and articulatory phonetic features) in adults with apraxia of speech (AOS) and adults with aphasia only. Group differences in the distribution of error type across contextual variables were also examined. Method Ten individuals with acquired AOS and aphasia and 11 individuals with aphasia participated in this study. In the context of a 2-group experimental design, the influence of 4 contextual variables on error rate and error type distribution was examined via repetition of 29 multisyllabic words. Error rates were analyzed using Bayesian methods, whereas distribution of error type was examined via descriptive statistics. Results There were 4 findings of robust differences between the 2 groups. These differences were found for syllable position, number of syllables, manner of articulation, and voicing. Group differences were less robust for clusters versus singletons and place of articulation. Results of error type distribution show a high proportion of distortion and substitution errors in speakers with AOS and a high proportion of substitution and omission errors in speakers with aphasia. Conclusion Findings add to the continued effort to improve the understanding and assessment of AOS and aphasia. Several contextual variables more consistently influenced breakdown in participants with AOS compared to participants with aphasia and should be considered during the diagnostic process. Supplemental Material https://doi.org/10.23641/asha.9701690

Using the Computer to Minimize SDS User Error Rate and Facilitate SDS Interpretation and Research

1978 ◽  
Vol 11 (3) ◽  
pp. 150-154
Author(s):  
Gary E. Price ◽  
Robert D. Michal ◽  
James M. O'Neil
Keyword(s):  
Error Rate

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake

How Useful is the Power Law of Practice for Recognizing Practice in Concentration Tests?

2007 ◽  
Vol 23 (3) ◽  
pp. 157-165 ◽  
Author(s):  
Carmen Hagemeister
Keyword(s):  
Logistic Regression ◽  
Reaction Time ◽  
Power Law ◽  
Error Rate ◽  
Reaction Times ◽  
Practice Effect ◽  
Practice Effects ◽  
Rate Decrease ◽  
Small Practice

Abstract. When concentration tests are completed repeatedly, reaction time and error rate decrease considerably, but the underlying ability does not improve. In order to overcome this validity problem this study aimed to test if the practice effect between tests and within tests can be useful in determining whether persons have already completed this test. The power law of practice postulates that practice effects are greater in unpracticed than in practiced persons. Two experiments were carried out in which the participants completed the same tests at the beginning and at the end of two test sessions set about 3 days apart. In both experiments, the logistic regression could indeed classify persons according to previous practice through the practice effect between the tests at the beginning and at the end of the session, and, less well but still significantly, through the practice effect within the first test of the session. Further analyses showed that the practice effects correlated more highly with the initial performance than was to be expected for mathematical reasons; typically persons with long reaction times have larger practice effects. Thus, small practice effects alone do not allow one to conclude that a person has worked on the test before.

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