• 전자공학회지
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• 제29권9호
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• pp.18-30
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• 2002

Wireless communication systems will be one of the biggest drivers of semiconductor products over the next decade. Global Positioning System (GPS) and Blue-tooth, HomeRF, and Wireless-LNA system are just a few of RF-module candidate awaiting integration into next generation mobile phone. Motivated by the generation mobile phone. Motivated by the growing needs for low-cost and multi-band/multi-function single chip wireless transceivers, CMOS technology has been recognized as a most promising candidate for the implementation of the future wireless communication systems. This paper presents recent developments in RF CMOS technology, which is classified into device technology and circuit technology and from them forecasts technology and from them forecasts technology trends in the near future.

• 한국경영과학회지
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• 제30권2호
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• pp.29-40
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• 2005

In this research, we propose packet scheduling algorithm considering different QoS characteristics of real-time traffic and non-real-time traffic in the next generation wireless communication system serving the multimedia traffic and a new efficient framing method cooperated with this packet scheduler. When the selected traffic classes of the selected users are transmitted, our proposed framing method can increase the number of serviced traffic classes by mixing the many different traffic classes within one frame considering data rate decided by the allocated AMC (Adaptive Modulation and Coding) option. Using this proposed method, the fairness among the traffic classes can be achieved and the system performance for total throughput and delay can be enhanced. Simulations are performed to analyze the performance of the proposed framing method. Our proposed packet scheduler and framing method will be applied to the next generation multimedia wireless communication system serving many traffic classes.

• International journal of advanced smart convergence
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• 제4권1호
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• pp.71-87
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• 2015

Mobile users want to be provided with undisrupted network services when they navigate on the Next-Generation (NG) wireless networks. For that, interlocking with a heterogeneous network is important, but there have been few studies on the method for guaranteeing global mobility. Thus, this paper proposes the Proxy-LMA technique, the mobile IP-based global inter-networking system, to enhance global mobility and interoperability within the Next-Generation (NG) network environment. The purpose of the proposed Proxy-LMA system is to expand the boundary of the mobility with regards to the existing mobility management protocol (PMIPv6 and MIPv6) in order to guarantee global mobility and interoperability within the heterogeneous network environment. The results of the performance evaluation showed that the proposed Proxy-LMA system was more efficient than other methods from the standpoint of signaling cost and delay in the heterogeneous network environment.

• 한국전자파학회지:전자파기술
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• 제12권3호
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• pp.49-59
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• 2001

Wireless communication systems will be one of the biggest drivers of semiconductor products over the next decade. Global Positioning System (GPS) and Blue-tooth, HomeRF, and Wireless-LNA system are just a few of RF-module candidate awaiting integration into next generation mobile phone. Motivated by the growing needs for lowcost and multi-band/multi-function single chip wireless transceivers, CMOS technology has been recognized as a most promising candidate for the implementation of the future wireless communication systems. This paper presents recent developments in RF CMOS technology so far, much of them have been developed in ETRI, and from them forecasts technology trends in the near future.

• 전자공학회지
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• 제29권9호
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• pp.1020-1020
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• 2002

Wireless communication systems will be one of the biggest drivers of semiconductor products over the next decade. Global Positioning System (GPS) and Blue-tooth, HomeRF, and Wireless-LNA system are just a few of RF-module candidate awaiting integration into next generation mobile phone. Motivated by the growing needs for low-cost and multi-band/multi-function single chip wireless transceivers, CMOS technology has been recognized as a most promising candidate for the implementation of the future wireless communication systems. This paper presents recent developments in RF CMOS technology, which is classified into device technology and circuit technology and from them forecasts technology trends in the near future.

• Journal of Communications and Networks
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• 제10권3호
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• pp.258-267
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• 2008

In this paper, we examine what changes the next-generation wireless communication systems will experience in terms of the technologies, services, and networks and, based on that, we investigate how the inter-cell interference management should evolve in various aspects. We identify that the main driving forces of the future changes involve the data-centric services, new dynamic service scenarios, all-IP core access networks, new physical-layer technologies, and heavy upload traffic. We establish that in order to cope with the changes, the next-generation inter-cell interference management should evolve to 1) set the objective of providing a maximal data rate, 2) take the form of joint management of power allocation and user scheduling, 3) operate in a fully distributed manner, 4) handle the time-varying channel conditions in mobile environment, 5) deal with the changes in interference mechanism triggered by the new physical-layer technologies, and 6) increase the spectral efficiency while avoiding centralized coordination of resource allocation of the users in the uplink channel.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3175-3177
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• 1999

In this study, the wireless communication system configuration and major equipments for KNGR will be introduced. Also the reliability and safety impact on the KNGR will be checked by reviewing /testing the EMI/RFI conditions of wireless communication system, The elements of the wireless communication system are radio exchange, base stations, portable telephone handsets.

• 한국항행학회논문지
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• 제15권6호
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• pp.1059-1067
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• 2011

차세대 ITS 환경에서는 도로에서 주행 중인 차량을 대상으로 하여 도로변에 RSE와 차량에는 OBU를 설치하여 고속 패킷 V2I 및 V2V 통신 기능, 보안 및 인증 기능, 기지국 셀 간 핸드 오버 기능 지원을 필요로 한다. 이에 따라, 이러한 서비스를 가능하게 하는 무선 통신 기술 역시 최대 200km/h의 차량 속도를 지원하고, 1km의 통신 거리를 가지며, 텍스트, 이미지, 동영상 등 멀티미디어 데이터 전송이 가능하도록 데이터 전송속도를 최소 10Mbps까지 지원하는 한편, 높은 통신 신뢰성을 갖도록 발전하고 있다. 본 논문에서는 IEEE 802.11p PHY/MAC을 기반으로 하는 WAVE 통신시스템을 구현하고, 차세대 ITS 환경에 부합하는지의 여부를 평가하였다.

• 한국항행학회논문지
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• 제13권4호
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• pp.544-550
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• 2009

본 논문은 밀리미터파 페이딩 채널에서 차세대 초고속 무선통신 시스템의 전파 전파 특성에 대해 제안한다. 도플러 천이와 레일리 페이딩을 동시에 고려하기 위해서 Jakes 모델의 페이딩 시뮬레이터를 구현하고 차세대 무선통신 시스템의 성능을 분석하였다. 또한 밀리미터파 페이딩 채널에서 DS-CDMA 시스템의 오율 특성을 분석하고 부호화 기법과 다이버시티기법에 의해 시스템의 성능이 향상됨을 확인 하였다.

• 한국항행학회논문지
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• 제16권1호
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• pp.54-61
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• 2012

차세대 ITS 환경을 위한 차량용 무선 통신 규격인 WAVE 규격은 IEEE 802.11p와 IEEE P1609 규격을 통칭하며, IEEE 802.11p의 규격제정이 마무리됨에 따라 최근 많은 연구가 진행되고 있다. 고속 차량 환경과 실내 환경의 차이는 무선 통신 채널 모델이 훨씬 가혹하다는 것이다. 따라서, 무선 통신 시스템의 설계 시 온도, 잡음, 다중 경로 페이딩과 같은 시스템의 성능을 저하시킬 수 있는 사항들을 충분히 고려하여야 한다. 본 논문에서는 IEEE 802.11p PHY/MAC을 기반으로 하는 WAVE 무선 통신 시스템을 위한 RF 회로를 설계하고 실제로 구현하면서 나타나는 문제들을 보이고 이를 해결하는 과정을 보였다.