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In various ground-penetrating radar (GPR) systems, antennas can not be in contact with ground medium perfectly. In this paper, we analyzed the effect of the antenna elevation on quality of bistatic GPR data. For this study, a pair of resistively-loaded dipoles with broadside (BD) and endfire (EF) configurations was modeled. In the numerical model, a ground medium contains an infinite perfect electric...
This paper proposes a novel symbol-to-bit demapping algorithm for Gray-labeled phase shift keying (PSK) constellations. Unlike the Max-Log-MAP demapper, the proposed algorithm does not perform exhaustive search operations, but directly computes the soft information by exploiting the binary search and the symmetry of the Gray-labeled PSK constellations. Hence its complexity is remarkably reduced from...
A 16-port shared-arm dipole array (SADA) is designed and its performance is numerically verified. When constructing a physical array structure using a dipole element for imaging radar applications, spacing between elements should be less than a quarter wavelength for alias-free sampling in the aperture domain. The SADA in this paper is designed such that two antenna elements share a single dipole...
We propose a design methodology of a bit mapper based on the extrinsic information transfer (EXIT)-chart analysis for the dual-polarized multiple-input multiple-output (MIMO) digital video broadcasting-2nd generation terrestrial (DVB-T2) system. The proposed methodology reduces the design complexity and the simulation results show that newly-designed bit mappers outperform over the conventional bit...
Serving a huge data rate of the ultra-high definition television (UHDTV) standard requires an enhancement of the transmission data rate of the conventional digital terrestrial transmission (DTT) systems. In order to improve the data rate, adopting dual-polarized MIMO techniques and higher order modulation schemes has been spotlighted. However, there are only few performance evaluations of the system...
A 2-port shared-arm dipole array is designed and its beam pattern investigated. In designing a dipole array for near-field imaging, longitudinal arrangement of the elements may become a problem due to the antenna spacing limit for alias-free sampling. The proposed shared-arm dipole array is designed such that the two adjacent dipole elements share a single dipole arm, achieving an alias-free sampling...
In this paper, a shared arm slot array is designed and its performance investigated for use in imaging radar. In constructing a physical array structure for near-field target sensing, spacing antenna elements may become problematic owing to the limited antenna spacing constraint for alias-free sampling in the aperture domain. The proposed shared arm slot array is designed such that two slot elements...
This paper presents the performance of the DVB-T2 broadcasting system including SISO, 2×1 MISO Alamouti and 2×2 MIMO Spatial Multiplexing. The DVB-T2 standard is now optionally using 2×1 MISO Alamouti system that is known to be optimal to achieve greater diversity gain. However in the future it is expected that the next generation of various broadcasting systems will take the MIMO system to obtain...
In this paper, a radiation pattern-reconfigurable antenna is designed to operate over DCS 1800 and PCS 1900 frequency bands. The electrical shape of the proposed antenna is symmetric about the vertical center axis. Depending on the switching state, the antenna alternates its beam direction between the two patterns with no input impedance variation. The antenna size is optimized in order to use PIN...
Communication between dental service providers and their patients is a key element of service quality. However, it is clear, and surveys confirm, that verbal communication during treatment is difficult for patients. In this paper, we discuss the development and service quality evaluation of a handheld device enabling limited communication during dental treatment. The shape and function of the device...
In hierarchical modulation (HM) based on DQPSK modulation, the performance of the receiver is influenced by the modulation noise and the demodulation method for base layer. To design an HM system, these performance penalty factors should be analyzed. This paper presents useful information for designing HM systems by doing mathematical and numerical analysis on their performance penalties.
For UWB radar applications, a small RD and an impulse generator have been designed and fabricated. The performance of the combined RD and the impulse generator has been proved through the radar scan experiment. The results show that the combined RD and the impulse generator functions well as a UWB radar components.
In this paper, the antenna with a practical structure is presented. Firstly, the size of the antenna is decreased from the original geometry by utilizing the image theory. The image theory also plays a role in removing the need for a balun. Secondly, the antenna includes two PIN diodes as switching devices.
32nm 3-bit 32Gb NAND Flash Memory for mass production has been successfully developed for the first time. To shorten the development time and lower the cost, one side double patterning technology in a gate direction and the minimum number of spare blocks have been adopted. Additionally, considering endurance and data retention of cell characteristics, the optimal gate and active lengths are fixed...
A beam reconfigurable antenna based on folded dipole structure has been presented. The antenna can switch beams without the input impedance variation. The front-to-back ratio is measured as approximately 7dB. To implement the antenna, a bi-stable leaf spring MEMS switch is considered.
Recently we have developed a precise quantitative phase-contrast microscope by in-line phase- shifting digital holography. The phase resolution of the system is 1.30 with blank image and which is better than those obtained with off-axis systems. The three-dimensional shape of a living fibroblast cell is measured with this system.
This paper discusses transmit antenna subset selection schemes for downlink closed-loop multiple-input multiple-output (MIMO) systems in multicell environments. A simplified cooperative scheme is proposed to increase the sum of the mutual information of the links in all cells. The proposed simplified-cooperative scheme is realistic in that it only utilizes a limited amount of information from adjacent...
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