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The cover image is based on the Research Article A discrete information coding matrix algorithm based on image features for tracking circulation of commodities by Guo Chun Wan et al., https://doi.org/10.1002/jnm.2597.
For fast‐consumed‐commodities industry, it is usually difficult for producers to track the commodities in their circulation process, especially, when their labels have been damaged. In this paper, we develop a novel method based on channel coding theory of forward error correction (FEC) to prevent the flooding of counterfeit products with a very low cost and easy implementation. This anti‐interference...
In order to adapt to the improvement of freight train braking technology, it is a good method to establish a semi‐physical braking intelligent test system, and the core technology of modeling and interface that supports the system is especially critical. Based on the above background, this paper is focus on the simulation modeling that reflects the braking performance characteristics of freight trains...
Quantum key distribution is the process of using quantum communication to establish a shared key between two parties. It has been demonstrated the unconditional security and effective communication of quantum communication system can be guaranteed by an excellent Gaussian random number (GRN) generator with high speed and an extended random period. In this paper, we propose to construct the Gaussian...
This paper proposes a compounded encoding and decoding algorithm based on the information‐grayscale matrix. Generally, it is very difficult to track the original information in the circulation of commodity. This algorithm is aimed to be applied to product tracing, especially fast‐moving consumer goods (FMCG). According to the traceability requirements of product information, we construct the structure...
We developed an advanced data acquisition system for the very long baseline interferometry used for deep‐space detection in recent years. However, there are serious time delay and phase inconsistency problems in the data acquisition system, which greatly increase the complexity of subsequent processors and reduce measurement accuracy. To solve the problem, we establish a numerical model to analyze...
This paper proposes an efficient modeling of series‐parallel structure for the digital downconversion (DDC) implemented in the field programmable gate array for astronomical observation system. The received signals by a radio telescope are of intermediate frequency, and they can be stored and analyzed only after having been converted into digital baseband signals. Although many algorithms have been...
In this paper, a miniaturized quarter-wavelength rectangular patch antenna with coaxial feed is proposed. The resonance frequency of the proposed antenna is simulated and measured so that the relationship between its mechanical deformation and resonance frequency can be determined. Also, additional tensile tests are employed to further clarify the relationship by increasing strain increments per loading...
The frequency-coded chipless RFID tag based on spiral resonators has stable performance, but its size is large and its capacity is small. In this paper, we combine the spiral filter structure with defected ground structure, which can control the attenuation effect generated by spiral filter structure. It encodes data according to the differences of attenuation between traps. The tag with six resonators...
Electromagnetic analysis for multilayered interconnect structures is carried out by integral equation approach in which volume-surface integral equations (VSIEs) are used. The conducting interconnects are described with surface integral equations (SIEs) whereas the dielectric substrates are governed by volume integral equations (VIEs). The VSIEs are usually solved by the method of moments (MoM) with...
The magnetic field integral equation (MFIE) in a timedomain form is used to describe transient electromagnetic (EM) scattering by conductors. The MFIE is a second kind of integral equation that can help improve the conditioning of the matrix equation but is less widely addressed in the time domain. The time-domain MFIE (TDMFIE) is generally solved by the spatial-domain method of moments (MoM) at each...
Accurate electromagnetic (EM) modeling for lossy conductors requires to consider their finite conductivity and the conducting loss is usually accounted for by an approximate surface impedance when the skin depth of current is small. However, such an approximation may not be valid for large skin depth caused by low frequencies or small conductivities. We propose a different approach to model the lossy...
Transient electromagnetic scattering by dielectric objects is formulated through time-domain electric field integral equations (TDFEIEs). The TDEFIEs are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. In the space-domain MoM, the magnetic current density is expanded by the n̂×RWG basis function and this could be problematic...
Terrestrial digital multimedia TV/handle broadcasting (DMB-TH) is a newly upcoming framing structure, channel coding and modulation for digital television terrestrial broadcasting system standard of China, which is recently drafted and is ready to be verified in order to deploy mobile multimedia broadcasting services for the public. The adoption of strong channel coding techniques appears to be of...
This paper focuses on the design of an adaptive orthogonal frequency division multiplexing (OFDM) system based on the feedback of interactive channel estimation. It shows how the interactive information of turbo code can be used to improve the precision of channel estimation and how the improved channel estimation is used to optimize the performance of the OFDM system adaptively. The result of simulation...
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