project: ieee p802.15 working group for wireless personal area networks (wpans)
DESCRIPTION
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] - PowerPoint PPT PresentationTRANSCRIPT
March 2004
Kei Obara, SIEMENSSlide 1
doc.: IEEE 802.15-04/0141r2
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:[[email protected]]
[Hiroyo Ogawa] Company [Communication Research Laboratory, Incorporated Administrative Agency]Address [3-4 Hikarino-oka, Yokosuka, Kanagawa, 239-09847 Japan.]Voice: [81-46-847-5066], FAX: [81-46-847-5079]E-mail: [[email protected],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 802.15-04/0141r2
Submission
MM-Wave WPAN Meeting System using OFDM
Kei Obara
SIEMENS
March 2004
Kei Obara, SIEMENSSlide 3
doc.: IEEE 802.15-04/0141r2
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 802.15-04/0141r2
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
March 2004
Kei Obara, SIEMENSSlide 5
doc.: IEEE 802.15-04/0141r2
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 6
doc.: IEEE 802.15-04/0141r2
Submission
Major parameters of prototype system
Symbol period (data) 2.56usGuard interval 0.32, 064usSubcarrier (data) 192Pilot 16Subcarrier bandwidth 390KHzOutmost subcarrier band81.25MHz
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)
IF frequency 1.5GHz
March 2004
Kei Obara, SIEMENSSlide 7
doc.: IEEE 802.15-04/0141r2
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 8
doc.: IEEE 802.15-04/0141r2
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 9
doc.: IEEE 802.15-04/0141r2
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 10
doc.: IEEE 802.15-04/0141r2
Submission
70GHz RF front end with 60degrees antenna
Baseband
IF adaptor
Developed system
March 2004
Kei Obara, SIEMENSSlide 11
doc.: IEEE 802.15-04/0141r2
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 802.15-04/0141r2
Submission
Backup slides
March 2004
Kei Obara, SIEMENSSlide 13
doc.: IEEE 802.15-04/0141r2
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