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In this paper, the bias-free operational uni-traveling-carrier photodiode (UTC-PD) for terahertz wave generation is designed via physics-based simulation. The physics-based model is established at first and then the reliability of the simulation is demonstrated by comparison to previously reported experimental results. The epitaxial layers of the UTC-PD are analyzed and investigated to improve its...
Blind recognition of error correcting code over GF (2) have been studied intensively in past few years, however, few works have been involved the case of non-binary codes. In order to approach the problem, a novel method for blind recognition of Reed-Solomon (RS) codes is proposed in this paper, which is based on Galois Field Fourier Transform of code polynomial. Moreover, theoretical analysis of...
In this paper, a new method for blind recognition of BCH code from an intercepted sequence of noise affected codewords is proposed. The proposed method recovers the parameters of a BCH code by finding the roots of it's generator polynomial. Firstly, the Galois Field Fourier Transform (GFFT) operation is carried out for each sequence of an estimated length. Then, find the positions of common zero spectral...
This paper designs a packaging structural of six-chip white LED down light with a total power of 15 W. The highest temperature of LED chip is 110.5°C, and the temperature of heat sink is 71.6 °C ∼73.2°C by finite element method (FEM). The experimental data are obtained by the thermocouple, with forward current of 700-mA at the ambient temperature of 35°C. The relative error between the simulation...
In recent years, highly glazed atria are popular because of their architectural aesthetics and advantage of introducing daylight into inside. However, cooling load estimation of such atrium buildings is difficult due to complex thermal phenomena that occur in the atrium space. The study aims to find out a simplified method of estimating cooling loads through simulations for various types of atria...
Since there is a great phase lag in the frequency characteristics of LCC resonant converter, a compensation network composed of a band-stop filter and a leading-and-lagging network is designed to stabilize the system. Simulation results verify that the output voltage can be regulated automatically under the disturbance of load changing and input fluctuation. And good steady-state accuracy and short...
In this paper, we give an expression of power spectral density (PSD) of all orthogonal frequency division multiplex (OFDM)-type signals. According to the analysis results, the different PSDs are compared between the original classic OFDM signals and the orthogonal frequency division multiplex/offset QAM (OFDM/OQAM) signals. With the consideration of the clipping peak-to-average power ratio (PAPR)...
This paper shows a strategy for the fuzzy logic control system using an offline simulated ball mill grinding approach. In this study, a step change in the force reference signal is considered a disturbance. The current study focuses on the design and implementation of a fuzzy logic control system for product flow rate of ball mill grinding process. The performance of the system is analyzed by simulating...
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