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Doc.: IEEE 802.15-05-0008-00-004a Submission Jan. 2005 THALES CommunicationsSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks.

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Presentation on theme: "Doc.: IEEE 802.15-05-0008-00-004a Submission Jan. 2005 THALES CommunicationsSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks."— Presentation transcript:

1 doc.: IEEE a Submission Jan THALES CommunicationsSlide 1 Project: IEEE P 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 FRANCE (2) 20 Science Park Road SINGAPORE] Voice:[(1) : +33 (0) , (2) : (65) ] [(1) : (2) : Re: [Response to Call for Proposals] Abstract:[This document proposes THALES Communications’s PHY proposal for the IEEE alternate PHY standard] Purpose:[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

2 doc.: IEEE a Submission Jan THALES CommunicationsSlide 2 Serge HETHUIN (THALES Communications) Dr. Jurianto JOE (CELLONICS) THALES Communications, CELLONICS Proposal for IEEE a UWB Impulse Radio

3 doc.: IEEE a Submission Jan THALES CommunicationsSlide 3 Contents UWB IR proposal System description Location Awareness Conclusion

4 doc.: IEEE a Submission Jan THALES CommunicationsSlide 4 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

5 doc.: IEEE a Submission Jan THALES CommunicationsSlide 5 UWB Pulse and Spectrum Example: 4ns Gaussian Pulse 1 st Frequency Center = 3.35GHz 10dB BW= 500MHz Tx Power (average) = dBm Objective: Impulse Pulse with 500MHz BW

6 doc.: IEEE a Submission Jan THALES CommunicationsSlide 6 UWB IR main features Low Power Consumption: o Very Simple Architecture o One Bit ADC (for the simplest version) Low Cost: o CMOS Implementation o 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  …,

7 doc.: IEEE a Submission Jan THALES CommunicationsSlide 7 System Description 1.Parameters of the PHY layer 2.Topologies and access protocol 3.Solution maturity 4.Options and eventual extensions

8 doc.: IEEE a Submission Jan THALES CommunicationsSlide 8 PHY layer: Parameters Data RatePRF (MHz)Modulation Compression gain (Spread Factor) Pulses / bit 25 Mbps25OOK kbps25OOK Mbps2.5OOK kbps2.5OOK kbps2.5OOK15 4ns Gaussian Pulse Data Rate depends on:  compression gain (~ Spread Factor)  PRF

9 doc.: IEEE a Submission Jan THALES CommunicationsSlide 9 PHY layer: Link Budget Parameters Value 350kbps 70m Value 25Mbps 10m Units Center Frequency3350 MHz Transmit Power (4ns Gaussian Pulse) dBm PRF2.525MHz Spread Factor71 Data Rate kbps Path Loss at 1m44 dB Distance7010m Decay coefficient2.0 - Additional Path Loss at 70m,10m dB Implementation Loss2.0 dB Antenna gain0.0 dBi Required dB Noise Power Density-174 dBm Receiver Total NF7.0 dB Margin4.9 dB

10 doc.: IEEE a Submission Jan THALES CommunicationsSlide 10 PHY layer: Transceiver architecture PG Non- coherent detector Spreading & Modulation Digital Block  Matched Filter  Signal Acquisition  Tracking  Ranging Etc. <100kgates 1-bit ADC Data MACDigital PHY LNA BB amp BPF Transmitter Receiver

11 doc.: IEEE a Submission Jan THALES CommunicationsSlide 11 PHY layer: Modulation & Spreading Specifications RF Frequency3350±250MHz (10dB BW) ModulationOOK SpreadingCoded Sequence Kasami (15, 63) and Gold (7) DespreadingDigital Matched Filter PRF25MHz, 2.5MHz

12 doc.: IEEE a Submission Jan THALES CommunicationsSlide 12 PHY layer: Synchronization Synchronization: Pulse Edge detection + Sequence Correlation using Digital Matched Filter Code Correlator Data Digital Domain

13 doc.: IEEE a Submission Jan THALES CommunicationsSlide 13 Topologies and access protocol Coordinator Anchor node FFD (Full Function Device) RFD (Reduced Function Device) Multiple Access: CDMA (inter-piconet) (intra-piconet) PAN Coordinator Code 1 Code 2 Code 3

14 doc.: IEEE a Submission Jan THALES CommunicationsSlide 14 Topologies and localization PAN Coordinator Code 1 Code 2 Code 3 Coordinator Anchor node FFD (Full Function Device) RFD (Reduced Function Device)

15 doc.: IEEE a Submission Jan THALES CommunicationsSlide 15 Inter-Piconet Multiple Access CDMA Inter-Piconet with one sequence / Piconet KASAMI 1 sequence KASAMI 2 sequence Intercorrelation between sequences 1 and 2

16 doc.: IEEE a Submission Jan THALES CommunicationsSlide 16 Frame format PPDU Bytes: PHY Layer Preamble 41 Frame Length SFD 1 MPDU Frame Control Seq. #Address Data Payload CRC Bytes: 210/4/82 MAC Sublayer n

17 doc.: IEEE a Submission Jan THALES CommunicationsSlide 17 Technical Feasibility and Maturity TRANSMITTER 4 ns 2-component UWB IR Generator 4 ns FPGA DATA

18 doc.: IEEE a Submission Jan THALES CommunicationsSlide 18 Technical Feasibility and Maturity Square-law Detector FPGA DATA RECEIVER

19 doc.: IEEE a Submission Jan THALES CommunicationsSlide 19 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 Sequence Binary Data Communication Analyzer OOK BB Pulses Variable Attenuator Recovered PN Sequence FPGA RX FPGA TX

20 doc.: IEEE a Submission Jan THALES CommunicationsSlide 20 Results of transceivers testing Consumption:  Tx=15 mA, Rx= 25 mA  Comparable to Tx and Rx power consumption in Data rate and range:  25 Mbps : 15m RF power=-14dBm)  250 kbps : >150m High Location Accuracy:  75cm with a range up to 70m

21 doc.: IEEE a Submission Jan THALES CommunicationsSlide 21 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

22 doc.: IEEE a Submission Jan THALES CommunicationsSlide 22 Location Awareness

23 doc.: IEEE a Submission Jan THALES CommunicationsSlide 23 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: 70m Range RFD FFD (Anchor) RFD FFD (Anchors)

24 doc.: IEEE a Submission Jan THALES CommunicationsSlide 24 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

25 doc.: IEEE a Submission Jan THALES CommunicationsSlide 25 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 (d 2 ) RTT (d 3 ) Wireless/Wired Network Distance d 1 d2d2 d3d3 Calculation of the Node Location based on the RTTs and the Reference Locations

26 doc.: IEEE a Submission Jan THALES CommunicationsSlide 26 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 Answer from anchor 1 RTT(d 1 ) information sent to the server RTT(d 1 ) RTT(d 2 ) RTT(d 3 ) RTT(d 2 ) information sent to the server RTT(d 3 ) information sent to the server

27 doc.: IEEE a Submission Jan THALES CommunicationsSlide 27 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

28 doc.: IEEE a Submission Jan THALES CommunicationsSlide 28 OWR System Deployment Synchronization by a node System Configuration for 2D location measurements TOA : t 0 +t 1 Time of Arrival: t 1 t2t2 t3t3 Synchronization station 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 : t 0 +t 2 TOA : t 0 +t 3

29 doc.: IEEE a Submission Jan THALES CommunicationsSlide 29 TOA Based Measuring Synchronization by a node t0t0 time Node to be located Anchor 3 Signal sent by the node to be located Anchor 1 Anchor 2 time t 0 +t 2 t 0 +t 1 t 0 +t 3 t1t1 t2t2 t3t3 TOA( t 0 +t 1 ) information sent to the server TOA( t 0 +t 2 ) information sent to the server TOA( t 0 +t 3 ) information sent to the server

30 doc.: IEEE a Submission Jan THALES CommunicationsSlide 30 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

31 doc.: IEEE a Submission Jan THALES CommunicationsSlide 31 Conclusion  THALES UWB IR main features: fc=3.35, 3.85, … GHz, BW=500MHz 4ns Gaussian Pulse with PRF of 25MHz/2.5MHz OOK 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)


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