OFDM - MIMO System(Multi input Multi Output)

SYSTEMS PROVIDER 2002.8.16THE STRATEGIC GROUP, Wireless LANs: Global Trends in Workplace and public DomainCOMPUTER & NETWORK LAN, 2002,7NIKKEI COMMUNICATIONS 2002.9.2ECR, 무선브로드밴드 인터넷 시장의 조사결과, 2002. 7.31국내김용균/이윤철, 무선LAN기술 및 시장동향, 주간기술동향01-48박용우, 무선랜 시장의 주요이슈 및 활성화 방안박용우, 무선랜 시장의 주요이슈 및 시사점, 정보통신정책 제14권8호박용우, 블루투스 기술발전에 따른 국내기업의 대응전략박용우, 3G,무선랜, 블루투스

multipleantennas, Wireless Personal Communications, 1998.4) Varaiya, P., “Space division multiple access (SDMA) for robust ad hoc vehicle communicationnetworks,” IEEE Intelligent Transportation Systems, Aug. 2001.5) Ligang Ren, “Interference cancellation technology in MIMO mobile cellular communication systems,”IEEE Electrical and Computer Engineering, vol. 3, Apr. 2003.6) Dubuc, A MIMO-OFDM prototype for next-generation wireless WANs, IEEE Communicationsmagazines, 2004.- 10 -그림 4 다중안테나 기술 무선채널 환경에서 초고속 통신을 위해서 중점

IEEE Commun. Mag., Mar 2003 5, 김성진, 김호진, 이주호, 이광복, An Overview of MIMO Technologies for Enhanced 3GPP HSDPA, Telecommunications Review, vol. 14, no. 3, pp. 380-398, 2004년 6월. 1. A. J. Goldsmith and S. B. Wicker, Design challenges for energy-constrained ad hoc wireless networks, IEEE Wireless Communications, pp. 8-27, Aug. 2002. 32. Cahners In-Star Group, Growth takes a holiday, 2002 subscriber forecast, Apr. 2002. 43. C. Edwards, P. Clarke, and S. Ohr, Power problems threaten launch of 3G handsets, EE Times, Feb. 14, 2000. 5

system• Joint detection and interference cancellation techniques for reducing interference• Soft handover enhancement techniques between designated cells• Various sub-channel access and coding techniques• Packet data• Fast handoff• Geo-location for calculating the position of terminal users• Multi-user detection (MUD)인터디지털사의 특허 전략10• High speed packet data channel coding• High speed packet data delivery in a mobile environmen그리고 최근에는 OFDMA(Orthogonal Frequency Division Multiple Access)와 MIMO(MultiInput Multi Output)와 관

OFDMA for multiple access and 8.75 MHz as a channel bandwidth. In February 2002, the Korean government allocated 100 MHz of electromagnetic spectrum in the 2.3 - 2.4 GHz band, and in late 2004 WiBro Phase 1 was standardized by the TTA of Korea and in late 2005 ITU reflected WiBro as IEEE 802.16e (mobile WiMAX). It adopted OFDM(Orthogonal Frequency Division Multiplexing) and MIMO(Multiple-Input Single-Output) technology which means that it has a lot of advantages being a 4G system.4. ServiceWe can use WIBRO only in Seoul Korea, but there are lots of merits in using it. WIBRO offers the inte