January 2005 Akira Maeki, Hitachi, Ltd. Slide 1 doc.: IEEE 802.15-04-0715- 02-004a Submission Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Networks (WPANs) Submission Title: [Hitachi Direct Sequence UWB Impulse Radio System ] Date Submitted: [January 2005] Source: [(1)Akira Maeki, Ryosuke Fujiwara, Kenichi Mizugaki, Masayuki Miyazaki, Masaru Kokubo, (2)Yasuyuki Okuma, Miki Hayakawa, Shinsuke Kobayashi, Noboru Koshizuka, Ken Sakamura ] Company [(1) Hitachi, Ltd., Central Research Laboratory and Advanced Research Laboratory, (2) YRP Ubiquitous Networking Laboratory ] Address [(1) 1-280 Higashi Koigakubo Kokubunji-shi, Tokyo 185-8601 JAPAN (2)28 th KOWA Bldg., 2-20-1, Nishi-Gotanda Shinagawa-ku, Tokyo 141-0031 JAPAN] Voice:[+81 42.323.1111], FAX: [+81 42.327.7849], E-Mail:[a- [email protected]] Re: [Response to Call for Proposals] Abstract: [This document proposes Hitachi, Ltd.’s PHY proposal for the IEEE 802.15.4 alternate PHY standard] Purpose: [Proposal for the IEEE802.15.4a standard.] 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
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January 2005
Akira Maeki, Hitachi, Ltd.Slide 1
doc.: IEEE 802.15-04-0715-02-004a
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: [Hitachi Direct Sequence UWB Impulse Radio System ]Date Submitted: [January 2005]Source: [(1)Akira Maeki, Ryosuke Fujiwara, Kenichi Mizugaki, Masayuki Miyazaki, Masaru Kokubo, (2)Yasuyuki Okuma, Miki Hayakawa, Shinsuke Kobayashi, Noboru Koshizuka, Ken Sakamura ] Company [(1) Hitachi, Ltd., Central Research Laboratory and Advanced Research Laboratory,
(2) YRP Ubiquitous Networking Laboratory ]Address [(1) 1-280 Higashi Koigakubo Kokubunji-shi, Tokyo 185-8601 JAPAN (2)28th KOWA Bldg., 2-20-1, Nishi-Gotanda Shinagawa-ku, Tokyo 141-0031 JAPAN]Voice:[+81 42.323.1111], FAX: [+81 42.327.7849], E-Mail:[[email protected]]
Re: [Response to Call for Proposals]
Abstract: [This document proposes Hitachi, Ltd.’s PHY proposal for the IEEE 802.15.4 alternate PHY standard]
Purpose: [Proposal for the IEEE802.15.4a standard.]
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.
January 2005
Akira Maeki, Hitachi, Ltd.Slide 2
doc.: IEEE 802.15-04-0715-02-004a
Submission
Akira MaekiHitachi, Ltd.
Hitachi, Ltd. Proposal for IEEE 802.15.4a
DS- UWB Impulse Radio
January 2005
Akira Maeki, Hitachi, Ltd.Slide 3
doc.: IEEE 802.15-04-0715-02-004a
Submission
Contents
• DS-UWB IR Proposal
• Details of the System Evaluation
• Location Awareness
• Summary
January 2005
Akira Maeki, Hitachi, Ltd.Slide 4
doc.: IEEE 802.15-04-0715-02-004a
Submission
Direct Sequence UWB Impulse Radio System (DS-UWB IR)
-Send 1000 Pseudo random packets through the variable attenuator (Variable attenuator represents Propagation Loss)-Measure the PER
PER<1% for 258kbps at 30m and 10.7Mbps at 10m
January 2005
Akira Maeki, Hitachi, Ltd.Slide 33
doc.: IEEE 802.15-04-0715-02-004a
Submission
Location Awareness
January 2005
Akira Maeki, Hitachi, Ltd.Slide 34
doc.: IEEE 802.15-04-0715-02-004a
Submission
Location Awareness
• Trilateration for Location Awareness - 3 Known-position Nodes (+1 sync. node) - Synchronization by a reference signal - TDOA (Time Difference Of Arrival) based
• High Location Accuracy : AWGN: 30cm in 30m Range Indoor Residential : <40cm in 40m Range
January 2005
Akira Maeki, Hitachi, Ltd.Slide 35
doc.: IEEE 802.15-04-0715-02-004a
Submission
Active-TDOA
• One-way Ranging
Can relax the RFD specifications
Can save power consumption
High Accuracy for mobile node location
• Accuracy
Accuracy depends only on the clock at the FFD
RFD
FFD(Anchor)
January 2005
Akira Maeki, Hitachi, Ltd.Slide 36
doc.: IEEE 802.15-04-0715-02-004a
Submission
System Configuration
System Configuration for 2D location measurements
Node
Server & Data Base
Monitor Terminal
Anchor Node 3
Anchor Node 1
Anchor Node 2
T2
T1
T3
TDOA(t1-T1)
TDOA(t2-T2)
TDOA(t3-T3)
Wireless/Wired Network
Time of Arrival: t1
t2
t3
“Calculation of the Node Location based on the TDOAs and the Reference Locations”
For Sync.
---Synchronization by a node--
-Expand the Range
January 2005
Akira Maeki, Hitachi, Ltd.Slide 37
doc.: IEEE 802.15-04-0715-02-004a
Submission
TDOA Based Measuring
time
Signal from a node whose position is known
time
Anchor 1
Anchor 2
time
The Location is calculated by the Time Difference those
Signal from a node for location
Anchor 1
Anchor 2
Anchor 1
Anchor 2
Anchors are not synchronized
Temporary synchronization
Measure the time difference of arrival
Reference time
---Synchronization by a node--
January 2005
Akira Maeki, Hitachi, Ltd.Slide 38
doc.: IEEE 802.15-04-0715-02-004a
Submission
Receiver Architecture
Counter Memory
Detection
Timing Counter
Sync. Demod.
• Count the time difference of arrival by the Counter• The Counter and Memory are the additional circuits to the Rx (Gate size: About 1kgates)
Receiver
January 2005
Akira Maeki, Hitachi, Ltd.Slide 39
doc.: IEEE 802.15-04-0715-02-004a
Submission
Parameters for Simulations
Packet Format: same packet as data transmission
Channel Model : Indoor Residential LOS (CM1)
Counter clock : 1GHz
ADC : 32Msps
Crystal Accuracy : 0ppm (ideal)
Number of trial : 100 for each distance
January 2005
Akira Maeki, Hitachi, Ltd.Slide 40
doc.: IEEE 802.15-04-0715-02-004a
Submission
Simulation Results
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
Distence (m)
Err
or
valu
e
(m)
Channel Model : Indoor Residential LOS (CM1)
Frequency Stability: 0ppm
January 2005
Akira Maeki, Hitachi, Ltd.Slide 41
doc.: IEEE 802.15-04-0715-02-004a
Submission
Summary
•DS-UWB IR is Simple, Scalable and Reliable 258kbps at 30m (Nominal), 10.7Mbps at 10m (Optional)
•Location Awareness: 40cm in 40m region (CM1) In a regular packet transmission, with one additional counter.
Proposed DS-UWB IR - fc=4.1GHz, BW=1.4GHz at Low Band (3.1-5.1GHz) - 2.5ns Gaussian Pulse with PRF of 32MHz - DBPSK Modulation - TDOA for Location Awareness
January 2005
Akira Maeki, Hitachi, Ltd.Slide 42
doc.: IEEE 802.15-04-0715-02-004a
Submission
Conclusion
• Still have evaluations to do…• Can show the feasibility in March
by the Test Bed and TEG chip
- Scalable data rate up to 10.7Mbps at 10m- High Location Accuracy of ~40cm in 40m range are the main differentiation from the 15.4 system