doc.: ieee 802.15-05-0008-00-004a submission jan. 2005 thales communicationsslide 1 project: ieee...

Jan. 2005

THALES CommunicationsSlide 1

doc.: IEEE 802.15-05-0008-00-004a

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: [THALES UWB Impulse Radio System ]Date Submitted: [January 3rd, 2005]

Source: [(1) Serge HETHUIN, Isabelle BUCAILLE, Arnaud TONNERRE, Fabrice LEGRAND, (2) Dr. Jurianto JOE]Company [(1) THALES Communications France, (2) CELLONICS]Address [(1) 146 Boulevard de VALMY, Colombes 92704 FRANCE (2) 20 Science Park Road 117674 SINGAPORE]Voice:[(1) : +33 (0)1 46 13 24 44, (2) : (65) 68 74 90 10 ]E-Mail:[(1) : [email protected], (2) : [email protected] ]

Re: [Response to Call for Proposals]

Abstract: [This document proposes THALES Communications’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.

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Serge HETHUIN (THALES Communications)Dr. Jurianto JOE (CELLONICS)

THALES Communications, CELLONICS

Proposal for IEEE 802.15.4a

UWB Impulse Radio

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Contents

• UWB IR proposal

• System description

• Location Awareness

• Conclusion

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

UWB Impulse Radio System(UWB IR)

T = 40 ns, PRF = 25 MHz max

time

Demo-dulator

Receiver

DATA

Transmitter

Pulse Generator

FPGA

Modu-lator

PA LNA BB

DATA

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

UWB Pulse and Spectrum

Example: • 4ns Gaussian Pulse• 1st Frequency Center

= 3.35GHz• 10dB BW= 500MHz• Tx Power (average)

= - 14.3dBm

Objective:Impulse Pulse with500MHz BW

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

UWB IR main features • Low Power Consumption:

o Very Simple Architectureo One Bit ADC (for the simplest version)

• Low Cost:o CMOS Implementationo 500MHz BW leading to many economic implementations

• High Location Accuracy: o Narrow Pulse (4ns) ~75cm in 70m region (AWGN)

• Scalability:by using :o compression gain (coded sequence)o different PRFs 350kbps @70m, … , 25Mbps @10m

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

System Description1. Parameters of the PHY layer2. Topologies and access protocol3. Solution maturity4. Options and eventual extensions

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

PHY layer: Parameters

Data Rate PRF (MHz) ModulationCompression gain(Spread Factor)

Pulses / bit

25 Mbps 25 OOK 1 1

396 kbps 25 OOK 63 63

2.5 Mbps 2.5 OOK 1 1

357 kbps 2.5 OOK 7 7

166 kbps 2.5 OOK 15 15

4ns Gaussian Pulse Data Rate depends on:

compression gain (~ Spread Factor) PRF

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

PHY layer: Link BudgetParameters

Value350kbps 70m

Value25Mbps 10m

Units

Center Frequency 3350 3350 MHz

Transmit Power(4ns Gaussian Pulse)

-14.3 -14.3 dBm

PRF 2.5 25 MHz

Spread Factor 7 1 　

Data Rate 357 25000 kbps

Path Loss at 1m 44 44 dB

Distance 70 10 m

Decay coefficient 2.0 2.0 -

Additional Path Loss at 70m,10m 37.0 20.0 dB

Implementation Loss 2.0 2.0 dB

Antenna gain 0.0 0.0 dBi

Required Eb/N0 @BER=0.001 10.0 10.0 dB

Noise Power Density -174 -174 dBm

Receiver Total NF 7.0 7.0 dB

Margin 4.9 4.9 dB

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

PHY layer: Transceiver architecture

PG

Non-coherent detector

Spreading &

Modulation

Digital BlockMatched FilterSignal AcquisitionTrackingRangingEtc.

<100kgates1-bit ADC

Data

Data

MACDigital PHY

LNA

LNA

BB amp

BPF

Transmitter

Receiver

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

PHY layer: Modulation & Spreading

Specifications

RF Frequency 3350±250MHz (10dB BW)

Modulation OOK

Spreading Coded SequenceKasami (15, 63) and Gold (7)

Despreading Digital Matched Filter

PRF 25MHz, 2.5MHz

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

PHY layer: SynchronizationSynchronization:• Pulse Edge detection • + Sequence Correlation using Digital Matched Filter

Code Correlator

Data

Digital Domain

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Topologies and access protocol

Coordinator

Anchor node

FFD (Full Function Device)

RFD (Reduced Function Device)

Multiple Access: CDMA (inter-piconet) 802.15.4 (intra-piconet)

PANCoordinator

Code 1

Code 2

Code 3

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Topologies and localization

PANCoordinator

Code 1

Code 2

Code 3

Coordinator

Anchor node

FFD (Full Function Device)

RFD (Reduced Function Device)

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Inter-Piconet Multiple AccessCDMA Inter-Piconet with one

sequence / Piconet

KASAMI 1sequence

KASAMI 2sequence

Intercorrelation betweensequences 1 and 2

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Frame format

PPDU

Bytes:

PHY Layer

Preamble

4 1

FrameLength

SFD

1

MPDU

FrameControl

Seq. # Address

Data Payload CRC

Bytes: 2 1 0/4/8 2

MAC Sublayer

n

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Technical Feasibility and Maturity

TRANSMITTER

4 ns

2-componentUWB IR Generator

4 ns

FPGA

DATA

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Technical Feasibility and Maturity

Square-lawDetector

FPGA

DATA

RECEIVER

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Prototypes characterization with a Test Bed• Communication Analyzer:

Generates PN Sequence Binary data to feed into FPGA TX.

• FPGA TX:

Encodes the binary data into OOK BB pulse and feeds it into the UWB Pulse Generator.

• Variable Attenuator:

Allows S/N to be varied.

• UWB receiver:

Converts the UWB signal to OOK BB pulse and feeds into FPGA RX.

• FPGA RX:

Decodes the pulses into binary data and feeds them back to the communication analyzer.

• Communication analyzer:

Internally compares the recovered sequence with the generated sequence and provides the BER on screen.

PN SequenceBinary Data

Communication Analyzer

OOK BBPulses

VariableAttenuator

RecoveredPN Sequence

FPGA RXFPGA TX

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Results of transceivers testing• Consumption:

Tx=15 mA, Rx= 25 mA Comparable to Tx and Rx power consumption in 802.15.4

• Data rate and range: 25 Mbps : 15m (@ RF power=-14dBm) 250 kbps : >150m

• High Location Accuracy: 75cm with a range up to 70m

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Options and eventual extensions• Multipath study:

On-going study (results in March 2005)

• Modulation improvements: DBPSK in complement of OOK

• Localization improvements: Processing to deal with Indoor environments (buildings,

underground park, …)

• Multiband extension (MBSC): Additional feature to discriminate the different piconets Additional capability for data rate increase Additional function to mitigate propagation problems

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Location Awareness

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Location Awareness

• Multilateration for Location Awareness: Two modes with at least 3 known-position nodes

Two-way ranging method (Round Trip Time measurement based)

One-way ranging method with one additional node for synchronization

(TOA based)

• High Location Accuracy:AWGN: 75cm @ 70m Range

RFD

FFD(Anchor)

RFD

FFD(Anchors)

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Mode 1: Two-Way Ranging method (TWR)

• Advantages Each measurement can be done sequentially

Possible extension to the case without anchors

• Synchronization No need of fine Sync.

• Accuracy Error is the combination of the detection in the

two nodes

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

TWR System Deployment

No need of Synchronization by a node Asynchronous Anchors

System Configuration for 2D location measurements

Node

Processing station & Data Base Control station

Anchor 3

Anchor 1

Anchor 2

RTT(d1)

RTT (d2)

RTT (d3)

Wireless/Wired Network

Distance d1

d2

d3

Calculation of the Node Location based on the RTTs and the Reference

Locations

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

TWR Based Measurement

time

Answer received in anchor 1

time

Anchor 1

Node to be located

time

Interrogation from anchor 1

Anchor 2

Anchor 3

Node to be located

Node to be located

Answer from anchor 1

RTT(d1) information sent to the server

RTT(d1)

RTT(d2)

RTT(d3)



Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Mode 2: One-Way Ranging method (OWR)

• Advantages Can relax the RFD specifications

• Synchronization More touchy than using RTT/TWR

• Accuracy Accuracy depends only on the clock of the FFD

• Transmit Only No need of detection in the node to be located

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

OWR System Deployment

Synchronization by a node

System Configuration for 2D location measurements

TOA : t0+t1 Time of Arrival: t1

t2

t3

Synchronizationstation

Node

Processing station & Data Base Control station

Anchor 3

Anchor 1

Anchor 2

Wireless/Wired Network

Calculation of the Node Location based on the TOAs and the Reference

Locations

TOA : t0+t2

TOA : t0+t3

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

TOA Based Measuring

Synchronization by a node

t0

time

Node to be located

Anchor 3

Signal sent by the node to be located

Anchor 1

Anchor 2

time

t0+t2

t0+t1

t0+t3

t1

t2

t3

TOA(t0+t1) information sent to the server



Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

• Multipath study:

• Localization experiments: In free space, rural and urban environments Comparison with MATLAB simulations

• Coherent receivers: Comparison in complexity with non-coherent receivers Comparison in cost with non-coherent receivers

• Miniaturization aspect: Integration of the solution Final power-consumption

On-going tasks

Jan. 2005


doc.: IEEE 802.15-05-0008-00-004a

Submission

Conclusion

THALES UWB IR main features:

fc=3.35, 3.85, … GHz, BW=500MHz4ns Gaussian Pulse with PRF of 25MHz/2.5MHzOOK modulation

Very low complexity, Very low cost (radio with a few components) Scalable (25Mbps at 10m, …, 350kbps at 70m, …)

Location Awareness:

Two possible modes: TWR or OWR 75cm in 70m region (AWGN)

doc.: ieee 802.15-05-0008-00-004a submission jan. 2005 thales communicationsslide 1 project: ieee...

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