• Title/Summary/Keyword: multi-modem

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Design and Implementation of the Channel Adaptive Broadband MODEM (채널 적응형 광대역 모뎀 설계 및 구현)

  • Chang, Dae-Ig;Kim, Nae-Soo
    • The KIPS Transactions:PartC
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    • v.11C no.1
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    • pp.141-148
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    • 2004
  • Recently, the demand of broadband communications such as high-speed internet, HDTV, 3D-HDTV and ATM backbone network has been increased drastically. For transmitting the broad-bandwidth data using wireless network, it is needed to use ka-band frequency. However, the use of this ka-band frequency is seriously affected to the received data performance by rain fading and atmospheric propagation loss at the Ka-band satellite communication link. So, we need adaptive MODEM to endure the degraded performance by channel environment. In this paper, we will present the structure and design of the 155Mbps adaptive Modem adaptively compensated against channel environment. In order to compensate the rain attenuation over the ka-band wireless channel link, the adaptive coding schemes with variable coding rates and the multiple modulation schemes such as trellis coded 8-PSK, QPSK, and BPSK are adopted. And the blind demodulation scheme is proposed to demodulate without Information of modulation mode at the multi-mode demodulator, and the fast phase ambiguity resolving scheme is proposed. The design and simulation results of adaptive Modem by SPW model are provided. This 155Mbps adaptive MODEM was designed and implemented by single ASIC chip with the $0.25\mu{m}$ CMOS standard cell technology and 950 thousand gates.

A Study about the architect who plans the modern time building of Incheon (인천의 근대건축물의 설계한 건축가에 관한 연구)

  • Sohn, Jang-Won;Park, Jung-Lan
    • Journal of The Korean Digital Architecture Interior Association
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    • v.5 no.2
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    • pp.15-20
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    • 2005
  • It extended in the opening after simultaneous strong point flag and to Incheon the building where the designer whom the many modem time building comes to build but becomes known was not many so. The research against these people did not become accomplished and not to be the back author research which analyzes the work propensity which is the possibility of doing the possibility of becoming accomplished there was not a basic of architectural design. The research which it sees it led and khu lu thu the road khey keyl the back the depths data, it confronted compared to it secured does not become known during that time the multi architect who and the plan office and and and it searched the result of the back which it puts out well it put to the architects who become known and.

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Plasticitic Characteristics of Hypertext in Costume (복식에 나타난 하이퍼텍스트의 조형적 특성)

  • Kwon, Jung-Sook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.30 no.2 s.150
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    • pp.198-206
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    • 2006
  • Hypertext is a web form consisted of HTML(hypertext markup language) which is used in Internet. Hypertext in costume is the product of modem industrial society. Hypertext is not a mechanical technique that enlarges external capacity of human beings. It is rather a motif that extends the internal ability of human beings. It brings about the social innovation by extending the expression realm of costume and providing the various views of recognition. This study regards costume not as an artistic work but as a text which interacts in the open relationship of human body, society and culture and causes dynamic generation of meaning. This study distinguishes Plasticitic Characteristics of Hypertext in Costume with intertextuality, rhizome, interactivity in the structural characteristics of hypertext which is a typical trait of digital culture of openness and variousness. In conclusion, this study clarified plasticitic value of modem costume, which expresses vague isms and the pargidm of multi-typed culture most sensitively and condretley, and expressional forms in relation with the structural characteristics of hypertext.

A Study on the Possibility of Model Development from Traditional Han-ok to Urban Clustering Housing Model in Korean Context (전통한옥의 도시집합주거로 발전 가능성 연구)

  • Shon, Seung-Kwang
    • Journal of the Korean housing association
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    • v.19 no.3
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    • pp.71-81
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    • 2008
  • A traditional Korean housing is a typical type which is contained life style, spatial organization and scape element of people who lived in Korea. In the hanok, people want to be live not only in human environment and traditional culture, but also modem urban housing as a high density. This article deals as follows: First, Hanok as urban housing would be composed in a housing lot, linear type layout, devide building, and cluster type. Second, Housing unit and configuration of Multi family housing can be used single story, second story, second story + single story, multi story and Hanok roofing. Thirds, structure of the building are traditional wooden, combined one of steel and wood or concrete and wood, and the building system in exterior and interior can be seperated into another system. Forth, Image of multi story Hanok A last, consistency of Hanok is not a repeat of an origin but application and creative aptitude of the origin, and multi family housing application of Hanok can be a trial creative.

MB-OFDM UWB modem SoC design (MB-OFDM 방식 UWB 모뎀의 SoC칩 설계)

  • Kim, Do-Hoon;Lee, Hyeon-Seok;Cho, Jin-Woong;Seo, Kyeung-Hak
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.8C
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    • pp.806-813
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    • 2009
  • This paper presents a modem chip design for high-speed wireless communications. Among the high-speed communication technologies, we design the UWB (Ultra-Wideband) modem SoC (System-on-Chip) Chip based on a MB-OFDM scheme which uses wide frequency band and gives low frequency interference to other communication services. The baseband system of the modem SoC chip is designed according to the standard document published by WiMedia. The SoC chip consists of FFT/IFFT (Fast Fourier Transform/Inverse Fast Fourier Transform), transmitter, receiver, symbol synchronizer, frequency offset estimator, Viterbi decoder, and other receiving parts. The chip is designed using 90nm CMOS (Complementary Metal-Oxide-Semiconductor) procedure. The chip size is about 5mm x 5mm and was fab-out in July 20th, 2009.

A Study on the Vernacular Trends of Typography (타이포그래피의 풍토적 경향에 관한 연구)

  • 원유홍
    • Archives of design research
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    • v.14 no.2
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    • pp.225-234
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    • 2001
  • Technically, the connotation of Typography is more than embodiments which are associated with records, keeping and expressions in languages. Therefore, it reflects a variety of social aspects based on cultures. The tendencies of modem Typography that have been confusing originate from the reaction caused by, what's called, cynical Rationalism - as a kind of characteristic. Nowadays, modem Typographic is required that it experience a new turning point with challenge and innovation. In association with the fact, it tends to be more local, compromised, dialectal, multi-cultural and anti-aesthetic. Moreover, there are multilateral tendencies concerned with generations and wealth & poverty. Consequently, the situation of modem Typographic which was regarded as an immovable role is now needed to change. The vernacular trends of Typographic changing with newer aspects is not always optimistic - it may be failure. However, at least, the experiments of it have expanded the range of modem Typographic. Therefore, the ultimate goal will be to obtain, what's called, potential data some of which are unknown to us.

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A Study on the Implementation of Power Line Modem for Remote Control Using DSP (DSP를 이용한 원격 제어용 전력선 모뎀 구현에 관한 연구)

  • Kim Su Nam;Kang Dong Wook;Kim Ki Doo;Yoo Hyeon Joong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.10C
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    • pp.1433-1443
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    • 2004
  • The power line modem proposed in this paper transmits the remote control signal using CSK(Code Shift Keying) and DS/SS method. The CSK technique provides the increased capacity of transmission and robustness towards noise. Besides, the DS/SS technique provides protection against narrow-band Gaussian interference and multi-path interference. The modem supports full-duplex communication using FDD(Frequency Division Duplex) and the modem structure for forward link is same with that for reverse link. To switch each sub-controlled unit smoothly, 4/$\pi$-DQPSK is adopted for noncoherent demodulation. The PN code for spreading spectrum seues to divide each group which consists of sub-controlled units and Walsh code is used for the M-ary CSK technique. Each block is designed and verified with TMS320C5402 DSP. We show the superiority of the proposed method by analyzing numerically the system performance for the factors of the DS/SS and CSK method ullder additive white Gaussian noise and PBI.

Phantom Protection Method for Multi-dimensional Index Structures

  • Lee, Seok-Jae;Song, Seok-Il;Yoo, Jae-Soo
    • International Journal of Contents
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    • v.3 no.2
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    • pp.6-17
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    • 2007
  • Emerging modem database applications require multi-dimensional index structures to provide high performance for data retrieval. In order for a multi-dimensional index structure to be integrated into a commercial database system, efficient techniques that provide transactional access to data through this index structure are necessary. The techniques must support all degrees of isolation offered by the database system. Especially degree 3 isolation, called "no phantom read," protects search ranges from concurrent insertions and the rollbacks of deletions. In this paper, we propose a new phantom protection method for multi-dimensional index structures that uses a multi-level grid technique. The proposed mechanism is independent of the type of the multi-dimensional index structure, i.e., it can be applied to all types of index structures such as tree-based, file-based, and hash-based index structures. In addition, it has a low development cost and achieves high concurrency with a low lock overhead. It is shown through various experiments that the proposed method outperforms existing phantom protection methods for multi-dimensional index structures.

The development of the level of repair analysis model with muti-indenture equipment structure (다단계 (multi-indenture) 구조를 갖는 장비의 수리수준 분석 모형 개발)

  • Yun, Won-Yeong;Kim, Gwi-Rae;Lee, Yu-Mi;Jeong, Il-Han;Park, Sam-Jun
    • Proceedings of the Korean Society for Quality Management Conference
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    • 2006.11a
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    • pp.145-150
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    • 2006
  • In terms of that modem equipment become expensive, sophisticated and huge, the cost of developing the equipment is much considered in ILS. Therefore, the model of the level of repair analysis about equipment which have the multi-echelon and multi-indenture are purposed to derive optimal repair policy which mostly satisfy the availability by using the Mixed Integer Programming within the minimum cost.

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A study on application of aggregation method based on power flow matching technique and multi-variable control method to the power system (선로 조류 유지 기법에 근거한 계통축약 및 다변수 제어기법 적용 연구)

  • Lee, Byung-Ha;Oh, Min-Hyuk;Baek, Jung-Myoung
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.342-344
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    • 2006
  • The modem enormous electric power system has made power system analysis much more complex and difficult. For effective analysis of the power system, model reduction and aggregation is required. In this paper, a new aggregation method is presented to aggregate the coherent generators in the large scale power system while matching the power flow. In order to demonstrate the effects of this aggregation method, it is applied to a small scale power system. A multi-variable control technique of $H_{\infty}$ control is also applied to enhance the dynamic stability of the aggregated power system.

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