doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [MM-wave WPAN Meeting System Using OFDM] Date Submitted: [18 March, 2004] Source: [Kei Obara] Company [SIEMENS] Address [3-4, Hikarino-oka, Yokosuka, Kanagawa , Japan] Voice:[+81(46) ], FAX: [+81(46) ], Re: [] Abstract:[Overview of WPAN meeting system using OFDM.] Purpose:[MM-wave Interest group March 2004 submission.] Notice:This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release:The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 2 MM-Wave WPAN Meeting System using OFDM

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 3 Background At the campus or company, meeting could be taken place at any place where people meet. High speed WPAN is suitable for nomadic meeting support system because of easy network setup. This application  Requires : High data rate, Secure access  Doesn’t require : Long distance transmission, High mobility Millimeter wave could be a good solution

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 4 Main features of the system Wideband OFDM in MM-Wave band --- taking advantage of sufficient bandwidth in 60-70GHz. 2 different protocols implemented (a) Ad Hoc protocol – enables automatic master-slave configuration (b)Multi-hop protocol – avoids NLOS problem in MM-Wave Physically secured system – no data leak to the next room due to high attenuation of mm-wave

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 5  The test protocol was developed to meet the requirements in a small office or home environment  In the initial stage, Master / Slave mode is selectable. Slaves are synchronized to Master  A slave can change to a master in case a master was stopped or transferred into a slave mode  The AP down command from any given MT in the network enables the user remotely to turn an AP into a MT Time Terminal 1 Switched on Switched OFF Mode Change Request First terminal becomes Master When the Master is switched off, another terminal becomes Master (selectable by different length of timer) 1 Master + 2 Slaves System Any Slave terminal is able to become Master by sending mode change request Terminal 3 Terminal 2 Master Slave Switched on Slave Master Master Ad hoc Protocol -- Concept

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 6 Multi-hop Protocol – Concept (case 1) Case 1: When AP and MT are in NLOS condition, MT start a link via EP. AP (Access Point) EP (Extension Point) MT (Mobile Terminal)

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 7 Case 2: MT keeps watching 2 links and use the better one to access to AP. Multi-hop Protocol – Concept (case 2) AP (Access Point) EP (Extension Point) MT (Mobile Terminal) Better link

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 8 70GHz RF front end with 60degrees antenna Baseband IF adaptor Developed system

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 9 Why OFDM ? Wide band antenna is preferred for this system --- users don’t have to adjust antenna direction By using wide band antenna, the system experiences strong multipath effect in millimeter wave band By using OFDM, multipath effect can be minimized

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 10 Major parameters of prototype system Symbol period (data)2.56 us Guard Interval0.32us, 0.64us Subcarrier (data)192 Pilot16 Subcarrier bandwidth390KHz Occupied bandwidth81.25MHz BPSK (R=1/2, 3/4) : User data rate (34, 50Mbps) ModulationQPSK (R=1/2, 3/4) : User data rate (66, 100Mbps) 8PSK (R=1/2, 3/4) : User data rate (100, 150Mbps) 16QAM (R=1/2, 3/4) : User data rate (134, 200Mbps)

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 11 Conclusions Short range (2-4m ??) and high speed WPAN system could be one of expected applications of mm-wave systems OFDM is employed for mm-wave WPAN system to reduce maltipath effect Ad hoc protocol has been implemented into the OFDM modem for easy network set up for small office/ meeting scenario. Multi hop protocol has been implemented ad minimize NLOS problem in millimeter wave ad hoc scenario

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 12 Backup slides

doc.: IEEE /0141r0-mmwi Submission March 2004 Kei Obara, SIEMENSSlide 13 70GHz, distance=4m Distance4m4m TX power8dBm TX antenna gain8dB Path 4m81.4dB RX antenna gain8dB Received power-61.4dBm kTB Bandwidth100MHz NF8dB Thermal noise-86dBm CNR24dB