• TTA Journal
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• s.110
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• pp.61-68
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• 2007

UWB는 2002년부터 FCC에서 상용을 허용한 이후 IEEE802.15.3a에서 DS-CDMA 방식과 MB-OFDM 방식을 논의해 왔으나 표준안 도출에 실패한 후 지금은 WiMedia Alliance와 UWB Forum에서 각기 표준화 진행중이다. Intel, Microsoft, HP 등이 주축인 WiMdeia Alliance는‘PAN 환경에서 장치간의 무선 멀티미디어 연결과 상호운용성’을 위하여 구성되었으며, 2003년 MBOA와 합병하여 MBOA 기술을 기반으로 하는 물리계층 및 MAC 계층 기능 규격을 ECMA 등에 표준으로 등록하였고, 그 외 표준화 단체에 표준안 채택을 위한 노력을 계속하고 있다. 또한 USB Forum, Bluetooth, IEEE1394 등에 MBOA 기반 응용이 사용될 수 있도록 노력하고 있으며, 2005년 MBOA 기반의 Certified Wireless USB 규격으로 UWB 시장을 선점하기 시작하였으며, Bluetooth 및 IEEE1394에서도 MBOA 기반 표준이 진행되고 있다. 본 고는 WiMedia Alliance의 최근 표준 활동과 WiMedia 규격을 활용한 국내.외 기술동향에 대하여 살펴보고자 한다.

• Information and Communications Magazine
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• v.24 no.9
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• pp.104-110
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• 2007

UWB는 2002년부터 FCC에서 상용을 허용한 이후 IEEE802.15.3a에서 DS-CDMA 방식과 MB-OFDM 방식을 논의해 왔으나 표준안 도출에 실패한 후 지금은 WiMedia Alliance와 UWB Forum에서 각기 표준화 진행중이다. Intel, Microsoft, HP 등이 주축인 WiMdeia Alliance는 "PAN 환경에서 장치간의 무선 멀티미디어 연결과 상호 운용성"을 위하여 구성되었으며, 2003년 MBOA와 합병하여 MBOA 기술을 기반으로 하는 물리계층 및 MAC 계층 기능 규격을 ECMA 등에 표준으로 등록하였고, 그 외 표준화 단체에 표준안 채택을 위한 노력을 계속하고 있다. 또한 USB Forum, Bluetooth, IEEE1394 등에 MBOA 기반 응용이 사용될 수 있도록 노력하고 있으며, 2005년 MBOA 기반의 Certified Wireless USB 규격으로 UWB 시장을 선점하기 시작하였으며, Bluetooth 및 IEEE1394에서도 MBOA 기반 표준이 진행되고 있다. 본 고는 WiMedia Alliance의 최근 표준 활동과 WiMedia 규격을 활용한 국내 외 기술동향에 대하여 살펴보고자 한다.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.2
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• pp.134-139
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• 2013

This paper describes design of a RF frequency synthesizer for the MBOA UWB systems with $0.13{\mu}m$ silicon CMOS technology. To generate effective clock signal of the MBOA novel technique which uses large scale multiplication in band of low frequency and small scale multiplication in band of high frequency has been used to reduce oscillation bandwidth of VCO. To get good performance of high speed and wide band operation characteristics a VCO using PMOS core structure and a frequency divider using super dynamic structure used in design of PLL circuit.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.4
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• pp.1-5
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• 2011

We present the implementation of MAC system for MBOA UWB SoC. The implemented MBOA MAC algorithm is not master control mechanism, but distributed network mechanism. Therefore, mesh network can be easily constructed because MAC consists of distributed network and administrates network. The ARM926EJ with cache is adopted for high performnace and AMBA bus is applied for system design and reuse. In addition, the system operating clock management algorithm is implemented for low power consumption. The dedicated DMA for MAC is designed between the system memory buffer and MAC hardware, and the dedicated DMA for USB 2.0 is also implemented between system memory buffer and host for high data transaction.

• TTA Journal
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• s.100
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• pp.161-169
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• 2005

IEEE802.15에서 표준화가 진행중인 WPAN(wireless personal network)은 개인영역 네트워크 혹은 근거리 무선 네트워크를 구축하기 위한 기술로, 개인용 컴퓨터, PDA, 주변기기, 휴대전화, 가전 등의 휴대나 이동 컴퓨팅을 위한 기술이다. IEEE802.15.1에서는 블루투스, IEEE802.15.4에서는 ZigBee를 위한 저속 WPAN(low rate WPAN) 그리고 IEEE802.15.3에서는 고속 WPAN(high rate WPAN)에 대한 표준화를 담당하고 있다. 본 고에서는 IEEE802.15 산하 TG3a에서 표준화 중인 Alt-PHY 기술로 경합을 벌이고 있는 MBOA(Multi-Band Orthogonal frequency division multiplexing Alliance) UWB(ultrawideband)에 대한 활성화를 꾀하고 있는 WiMedia Alliance의 시험인증 동향을 고찰하고자 한다.

• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.9
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• pp.270-275
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• 2012

This paper describes design of a variable-N frequency synthesizer for RF PLL with $0.13{\mu}m$ silicon CMOS technology being used as an application of the UWB system like MBOA. To get good performance of speed and noise super dynamic circuits was used, and to get variable-N division ratio MOSFET switching circuits was used. Especially to solve narrow bandwidth problem of the dynamic circuits load resistance value of unit divider block was varied. Simulation results of the designed circuit shows very fast and wide operation characteristics as 5~26GHz frequency range.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.48 no.1
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• pp.56-61
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• 2011

This paper describes design of a programmable frequency synthesizer for RF PLL with $0.18{\mu}m$ silicon CMOS technology being used as an application of the UWB system like MBOA. To get good performance of speed and noise super dynamic circuits was used, and to get programmable division ratio switching circuits was used. Especially to solve narrow bandwidth problem of the dynamic circuits load resistance value of unit divider block was varied. Simulation results of the designed circuit shows very fast and wide operation characteristics as 1~14GHz frequency range.

• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.293-296
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• 2004

This paper proposes an architecture of channel estimation for multi-band OFDM UWB systems presented to IEEE 802.15.3a by Multi-band OFDM alliance(MBOA). The multi-band OFDM (MB-OFDM) systems should have channel estimation for compensation of signal distortion by multi-band channel. The moving-averaging estimation algorithm and multi-band equalization architecture for MB-OFDM UWB systems proposed in this paper was verified by the simulation. Simulation results show that MB-OFDM system with the proposed architecture have the performance improved by about 3.4 dB compared to system with no channel estimation in 0.1$\pi$ phase-rotated channel.

• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.305-308
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• 2004

In this paper, we analyze system level and link level performance for MB-OFDM UWB system. we propose physical layer model of MB-OFDM UWB system in MBOA. For this analysis, Base-band channel model from IEEE 802.15 3a was adopted. we considered the channel index parameter to select any one of 100 distinct realizations provided by the IEEE working group. Our experimental results indicate BER values according to Es/No.

• IEMEK Journal of Embedded Systems and Applications
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• v.2 no.1
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• pp.66-75
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• 2007

In this paper, we have propose a preamble structure and synchronization/channel estimation method for UWB-MIMO which has 960Mbps transmit rate. The proposed structure is a compatible preamble structure for synchronization/channel estimation used by MIMO in MB-OFDM(Multi-Band OFDM) systems that are one of the standard systems of MBOA. The system is compatible with MB-OFDM using the proposed preamble structure. In this paper, we argue the problem in receiver part used by MIMO technique. And we simulate the proposed preamble for using synchronization/channel estimation. The simulation result shows the same performance compared with single receiver antenna.