1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Direct Sequence UWB Impulse Radio System ]
Date Submitted: [September 13th, 2004]
Source: [(1)Akira Maeki, Masaru Kokubo, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara,
(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) Higashi Koigakubo Kokubunji-shi, Tokyo JAPAN
(2)28th KOWA Bldg., , Nishi-Gotanda Shinagawa-ku, Tokyo JAPAN]
Voice:[ ], FAX: [ ],
Re: [Response to Call for Proposals]
Abstract: [This document proposes Hitachi, Ltd.’s PHY proposal for the IEEE alternate PHY standard]
Purpose: [Preliminary Proposal for the IEEE a standard.]
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
Akira Maeki, Hitachi, Ltd.
<author>, <company>

2. Hitachi, Ltd. Preliminary Proposal for IEEE 802.15.4a Alternate PHY
<month year>
doc.: IEEE <doc#>
September 2004
Hitachi, Ltd. Preliminary Proposal for IEEE a Alternate PHY
DS- UWB Impulse Radio
Akira Maeki
Hitachi, Ltd.
Akira Maeki, Hitachi, Ltd.
<author>, <company>

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Contents
DS-UWB IR Proposal
Location Awareness
Summary
Akira Maeki, Hitachi, Ltd.
<author>, <company>

4. Direct Sequence UWB Impulse Radio System (DS-UWB IR)
<month year>
doc.: IEEE <doc#>
September 2004
Direct Sequence UWB Impulse Radio System (DS-UWB IR)
Pulse
Generator PA
Impulse Radio
DBPSK
Transmitter t
PRF=Tens of MHz
PRF :Pulse Repetition Frequency
Receiver RF BB
Akira Maeki, Hitachi, Ltd.
<author>, <company>

5. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
UWB Pulse and Spectrum
Initial Target
: Arbitrary Pulse
in Low Band ( GHz)
-40
-50
-60
Example:
2.5ns Gaussian Pulse
Center Frequency=4.1GHz
3dB BW=660MHz
TxPower (ave.)= - 9.8dBm
EIRP (dBm/MHz)
-70
Low Band
( GHz)
High Band
(6-10GHz)
-80
-90 1 2 3 4 5 6 7 8 9 10 11
Frequency (GHz)
Akira Maeki, Hitachi, Ltd.
<author>, <company>

6. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Why DS-UWB IR?
Low Power Consumption :
-Very Simple Architecture
-Low Rate Sampling ADC : Tens of Msps, 2-4bits
Low Cost
-CMOS Implementation is Feasible (Peak Power <10dBm)
-Low Band ( GHz)
High Location Accuracy : ~30cm in 30m range (AWGN)
Best Fit to 4a Applications (Sensor Network etc.)
Low Cost, Low Power, High Location Accuracy!
Akira Maeki, Hitachi, Ltd.
<author>, <company>

7. Scalability with spread factor
<month year>
doc.: IEEE <doc#>
September 2004
Scalability with spread factor
Data Rate
Modulation
Spread Factor
Number of Pulses / Bit
32.0 Mbps
DBPSK 1
10.7 Mbps 3
4.57 Mbps 7
2.13 Mbps 15
1.03 Mbps 31
258 kbps
124
129 kbps
248
PRF=32MHz
Akira Maeki, Hitachi, Ltd.
<author>, <company>

8. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Link Budget
Parameters
Value
0.129Mbps 30m
1.03Mbps 10m
Units
Center Frequency
4096
MHz
Transmit Power
(2.5ns Gaussian Pulse)
-9.8
dBm
PRF 32
Spread Factor
248 31
Data Rate
0.129
1.03
Mbps
Path Loss at 1m
44.7 dB
Distance 30 10 m
Decay coefficient
2.0 　-
Additional Path Loss at 30m,10m
29.5
20.0
Implementation Loss
3.0
Antenna gain
-3.0
dBi
Required 32B
14.0
9.8
Noise Power Density
-174
Receiver Total NF
7.0
Margin
11.9
16.5
Akira Maeki, Hitachi, Ltd.
<author>, <company>

9. Implementation Feasibility
<month year>
doc.: IEEE <doc#>
September 2004
Implementation Feasibility
Example:
Transmitter PA
Pulse
Generator
Spreading
Data
ANT.
Switch
Analog RF
Digital PHY
BPF
MAC I
LPF
ADC
Digital Block
LNA
Data
0/90
PLL
Matched Filter
Signal Acquisition
Tracking
etc.
4.1GHz
Receiver
LPF
ADC
<150kgate Q
Ranging
Akira Maeki, Hitachi, Ltd.
<author>, <company>

10. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Location Awareness
Trilateration for Location Awareness
- 3 Known-location Nodes
- TDOA (Time Difference Of Arrival)
High Location Accuracy : ~30cm in 30m range (AWGN)
Wireless/Wired Network
Monitor Terminal
TDOA
(t1-T1)
(t2-T2)
(t3-T3)
Reference Node 2
Server & Data Base
Time of Arrival: t1 t2 t3 T2 T1 T3
Reference Node 3
“Calculation of the Node Location
based on the TDOAs and the Reference Locations”
For Sync.
Node
System Configuration for 2D location measurements
(Synchronization by a node)
Reference Node 1
Akira Maeki, Hitachi, Ltd.
<author>, <company>

11. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
September 2004
Summary
DS-UWB IR is very Simple and Best Fit!
-Low Power
-Low Cost :CMOS implementation
-High Location Accuracy
:　~30cm in 30m range at AWGN channel
Proposed DS-UWB IR
-fc=4.1GHz, BW=660MHz at Low Band ( GHz)
-2.5ns Gaussian Pulse with PRF of 32MHz
-DBPSK Modulation
Akira Maeki, Hitachi, Ltd.
<author>, <company>