Gwang-Sun Kim

This paper presents novel ultrareliable and low-latency communication (URLLC) techniques for URLLC services, such as Tactile Internet services. Among typical use cases of URLLC services are teleoperation, immersive virtual reality, cooperative automated driving, and so on. In such URLLC services, new kinds of traffic such as haptic information including kinesthetic information and tactile information need to be delivered in addition to high-quality video and audio traffic in traditional multimed

In this paper, a novel preamble structure, including a synchronization field (S-field) and a cell-search field (C-field), is proposed for orthogonal-frequency-division-multiplexing-based cellular systems. An efficient algorithm for downlink synchronization and cell search using the preamble is also proposed. The synchronization and cell-search process includes the initial symbol-timing estimation using continuously or, at least, periodically transmitted downlink signal, the frame detection, the

In this paper, a novel preamble structure, including a synchronization field (S-field) and a cell searching field (C-field), is proposed. An efficient algorithm for downlink synchronization and cell searching using the preamble is also proposed. The synchronization process includes initial symbol timing estimation using continuously or at least periodically transmitted downlink signal, frame detection, fine symbol timing estimation and frequency offset estimation using the preamble S-field, and

An efficient multi‐user multiple‐input–multiple‐output (MIMO) protocol is proposed and verified to be significantly advantageous over the conventional IEEE 802.11ac protocol for next‐generation wireless local area network systems employing massive MIMO and orthogonal frequency division multiple access.

We propose and analyze concatenated coding schemes for direct-sequence code-division multiple-access (DS/CDMA) systems in asynchronous channels. In the concatenated coding, bandwidth-efficient 2/sup 2L-2/-state L/(L+1)-rate 2-MTCM with biorthogonal signal constellation is used for the inner code, and (2/sup L/-1,[(2/sup L/-1)/L/2]) RS code is used for the outer code. It is shown that we can get considerable performance gain over the uncoded system without sacrificing the data transmission rate.

The performance of DS/CDMA systems using forward link beamforming and RAKE diversity combining is investigated analytically in frequency selective fading channels, whereas previous studies have resorted to Monte Carlo simulations in flat fading channels. The capacity of DS/CDMA systems is considerably improved by employing forward link beamforming.

Kim Kwang Soon. 2015. The aspect of extension and use of kinship terms of address-in the center of {hyeong}, {nuna}, {oppa}, {unni}. Korean Semantics, 48. This study on the characteristics of the aspect that {hyeong}, {oppa}, {nuna}, and {unni} included in kinship terms in Korea are extended to and used as the terms to address people in a non-kinship group. Kinship terms are lexeme selected and used based on [blood relations]. However they are also used in subjects to [-blood relations] in moder

We propose and analyze a multiuser receiver using a decorrelating filter and Viterbi decoders for trellis-coded direct-sequence code-division multiple-access (DS/CDMA) systems with biorthogonal signal constellation in asynchronous channels. The biorthogonality is implemented by user signature waveforms and the decorrelating filter. The performance of the proposed system is investigated with emphasis on the asymptotic cases: it is shown that the proposed system provides us with some coding gain a

For pt.I see ibid., vol.50, p.2018-31 (2002). In part I, we proposed and investigated a hybrid pulse position modulation/ultrashort light pulse code-division multiple-access (PPM/ULP-CDMA) system for ultrafast optical communication networks. In this scheme, the large bandwidth of a ULP is efficiently utilized by virtue of the very high time resolution of a time-space processor. More detailed analysis and discussion on the receiver scheme using the time-space processor is now presented; nonideal

This study on the evaluation and suggestion regarding synonyms. This article contains the novel evaluation and suggestion regarding synonyms. In the previous discussions about synonyms, the major study method was to classify the common meaning and the individual meaning by investigating the individual meaning of each lexeme with a dictionary and the examples of corpus data. However, this research method has not fully discussed the principle of how each lexeme becomes a synonym. In addition, cate

A vector channel model is proposed and some statistical properties of the asymptotic efficiency of the decorrelating detector with base-station antenna arrays are investigated. It is shown that we can get gain over the conventional decorrelator by employing antenna arrays and the gain increases as the number of antennas increases and the angle dispersion decreases. It is also shown that we can increase the asymptotic efficiency of the decorrelating detector with base-station antenna arrays up to

Multiuser detection has been an interesting topic because of its capability of eliminating multiuser interference and resistance to the near-far problem. The decorrelator approach has been investigated as a suboptimum multiuser detector for a low complexity receiver at the expense of the enhancement and correlation of noise. We consider a quasi-maximum likelihood (quasi-ML) detector in the reverse link system which uses antenna arrays in quasi-synchronous channels. It is shown that the performan

We consider nonparametric signal detection problems under the presence of additive noise exhibiting weak dependence. We derive the test statistic of the locally optimum rank detector under a weakly dependent noise model for random signals. The performance characteristics of the locally optimum rank detector are analyzed in terms of asymptotic relative efficiency.

To date, Korean color terms have been actively discussed in a variety of aspects among multiple scholars. However, Korean color terms have not been discussed objectively based on authentic data, which will be supplemented by this study. In particular, the Korean color terms {Kemta} and {Kkamahta}, are widely used in the Korean language, but there is no information available related to the usage of these words. In order to provide this information, this research will show the difference in usage