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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]

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slide1

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.

Kei Obara, SIEMENS

slide2

MM-Wave WPAN Meeting System using OFDM

Kei Obara

SIEMENS

Kei Obara, SIEMENS

slide3

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

Kei Obara, SIEMENS

slide4

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

  • Multi-hop protocol – avoids NLOS problem in MM-Wave

Kei Obara, SIEMENS

slide5

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

Kei Obara, SIEMENS

slide7

Ad hoc Protocol -- Concept

Terminal 2

Terminal 1

Terminal 3

First terminal becomes Master

Switched on

Switched on

Master

Switched on

Slave

1 Master + 2 Slaves System

Slave

Time

When the Master is switched off, another terminal becomes Master (selectable by different length of timer)

Switched OFF

Master

Mode Change Request

Any Slave terminal is able to become Master by sending mode change request

Master

Slave

  • 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

Kei Obara, SIEMENS

slide8

Multi-hop Protocol – Concept (case 1)

EP(Extension Point)

MT(Mobile Terminal)

AP(Access Point)

Case 1:When AP and MT are in NLOS condition, MT start a link via EP.

Kei Obara, SIEMENS

slide9

Multi-hop Protocol – Concept (case 2)

EP(Extension Point)

Better link

MT(Mobile Terminal)

AP(Access Point)

Case 2:MT keeps watching 2 links and use the better one to access to AP.

Kei Obara, SIEMENS

slide10

Developed system

IF adaptor

70GHz RF front end with 60degrees antenna

Baseband

Kei Obara, SIEMENS

slide11

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

Kei Obara, SIEMENS

slide12

Backup slides

Kei Obara, SIEMENS

slide13

Linkbudget @ 70GHz , distance=4m

Distance

4m

TX power

8dBm

TX antenna gain

8dB

Path loss @ 4m

81.4dB

RX antenna gain

8dB

Received power

-61.4dBm

kTB (@300K)

-174dBm/Hz

Bandwidth

100MHz

NF

8dB

Thermal noise

-86dBm

CNR

24dB

Kei Obara, SIEMENS