Analysis of beat noise in OCDMA system with saddle point approximation method

Under continuous cutting conditions, the reliability of alumina-based ceramic cutting tools wear life with abrasion wear was discussed extensively. An ultimate state equation of alumina-based ceramic cutting tools wear life was proposed according to stress-strength interference theory. Based on the premise that the probability distribution of random parameters has been known, the fracture toughnessKICand the hardnessHwhich obey Weibull distribution were transformed into normal distribution by means of the equivalent normal distribution method, and then the reliability of alumina-based ceramic cutting tools wear life was analyzed by saddle point approximation method. The probability density function and cumulative distribution function of the ultimate state equation were accurately and quickly obtained by way of saddle point approximation, as a result, the saddle point approximation method was proved accurate with high computing speed in comparison with the Monte-Carlo method. Therefore, the application of the saddle point approximation method developed the reliability analysis theory of alumina-based ceramic cutting tools wear life.

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Uncertainty-Based Design and Optimization Using First Order Saddle Point Approximation Method for Multidisciplinary Engineering Systems

ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems Part A Civil Engineering ◽

10.1061/ajrua6.0001076 ◽

2020 ◽

Vol 6 (3) ◽

pp. 04020028 ◽

Cited By ~ 2

Author(s):

Debiao Meng ◽

Tianwen Xie ◽

Peng Wu ◽

Shun-Peng Zhu ◽

Zhengguo Hu ◽

...

Keyword(s):

Saddle Point ◽

Approximation Method ◽

Engineering Systems ◽

Saddle Point Approximation ◽

Design And Optimization ◽

First Order ◽

Point Approximation

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Saddle Point Approximation of Mutual Information for Finite-Alphabet Inputs over Doubly Correlated MIMO Rayleigh Fading Channels

Applied Sciences ◽

10.3390/app11104700 ◽

2021 ◽

Vol 11 (10) ◽

pp. 4700

Author(s):

Yuyu Liu ◽

Jinbao Zhang ◽

Dan Zhang

Keyword(s):

Mutual Information ◽

Saddle Point ◽

Fading Channels ◽

Approximation Method ◽

Rayleigh Fading ◽

Saddle Point Method ◽

Finite Alphabet ◽

Rayleigh Fading Channels ◽

Saddle Point Approximation ◽

Point Approximation

Given the mutual information of finite-alphabet inputs cannot be calculated concisely and accurately over fading channels, this paper proposes a new method to calculate the mutual information. First, the applicability of the saddle point method is studied, and then the mutual information is estimated by the saddle point approximation method with known channel state information. Furthermore, we induce the expectation of mutual information over doubly correlated multiple-input multiple-output (MIMO) Rayleigh fading channels. The validity of the saddle point approximation method is verified by comparing the numerical results of the Monte Carlo method and the saddle point approximation method under different doubly correlated MIMO fading channel scenarios.

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