March 2004

Kei Obara, SIEMENSSlide 1

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 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 239-0847, Japan]Voice:[+81(46) 847-5129], FAX: [+81(46) 847-5089], E-Mail:[K.Obara@crl.go.jp]

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 P802.15. 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 P802.15.

March 2004

Kei Obara, SIEMENSSlide 2

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

MM-Wave WPAN Meeting System using OFDM

March 2004

Kei Obara, SIEMENSSlide 3

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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

March 2004

Kei Obara, SIEMENSSlide 4

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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

March 2004

Kei Obara, SIEMENSSlide 5

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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

Tim

e

Terminal 1

Switched onSwitched 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 3Terminal 2

MasterMasterSlave

Switched on

Slave

MasterMaster

Slave MasterMaster

Ad hoc Protocol -- Concept

March 2004

Kei Obara, SIEMENSSlide 6

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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)

March 2004

Kei Obara, SIEMENSSlide 7

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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 li

nk

March 2004

Kei Obara, SIEMENSSlide 8

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

70GHz RF front end with 60degrees antenna

Baseband

IF adaptor

Developed system

March 2004

Kei Obara, SIEMENSSlide 9

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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

March 2004

Kei Obara, SIEMENSSlide 10

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

Major parameters of prototype system

Symbol period (data)2.56 usGuard Interval 0.32us, 0.64usSubcarrier (data) 192Pilot 16

Subcarrier bandwidth390KHzOccupied bandwidth 81.25MHz

BPSK (R=1/2, 3/4) : User data rate (34, 50Mbps)Modulation QPSK (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)

March 2004

Kei Obara, SIEMENSSlide 11

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

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

March 2004

Kei Obara, SIEMENSSlide 12

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

Backup slides

March 2004

Kei Obara, SIEMENSSlide 13

doc.: IEEE 802.15-04/0141r0-mmwi

Submission

Linkbudget @ 70GHz , distance=4m

Distance 4m

TX power 8dBmTX antenna gain8dBPath loss @ 4m 81.4dBRX antenna gain8dB

Received power-61.4dBm

kTB (@300K) -174dBm/HzBandwidth 100MHzNF 8dB

Thermal noise -86dBm

CNR 24dB