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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Samsung DM R&D Center Proposal Date Submitted: XX December, 2004 Source: Namhyong Kim et al., Samsung Electronics Digital Media R&D Center

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Samsung DM R&D Center Proposal

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December 2004

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title:Samsung DM R&D Center Proposal

Date Submitted: XX December, 2004

Source:Namhyong Kim et al., Samsung Electronics Digital Media R&D Center

Address 416 Maetan 3 Dong, Yeongtong Gu, Suwon City, Gyongi Do, Korea, 443-742

Voice: 82 31 200 8783, FAX: 82 31 200 3350, E-Mail: [email protected]

Re:[Response to Call for Proposals]

Abstract:

Purpose:[Proposing a PHY-layer interface for standardization by 802.15.4a]

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.

Namhyong et al., Proposal


December 2004

Samsung DM R&D Center Proposal

Multiple Access and Range Methodology

for Chaos DCSK System

Namhyong Kim, Inhwan Kim

Samsung Electronics DM R&D Center

Namhyong et al., Proposal


Contents

Contents

  • Nature of Chaos Signal

  • DCSK( Differential Chaotic Shift Keying )

  • SOP over Chaos Communication System

  • Range over Chaos Communication System

  • Conclusion

Namhyong et al., Proposal


December 2004

Chaotic Source

  • Pseudo-random Sequence

  • Ordinary Differential Equation

Namhyong et al., Proposal


Pseudo random sequence

Pseudo-Random Sequence

  • Pseudo-Chaos Signal Generator

    • Pseudo-random Sequence filtered by Chebyshev Type I

      • Pseudo-random numbersranging between -1.0 to +1.0

      • Chebyshev Specification

        • Passband : 0.15 < f < 0.25

        • Stopband : f < 0.14 or 0.28 < f

        • Ws Attenuation : 15 dB

        • Wp Ripple : 1 dB

Namhyong et al., Proposal


Chaotic signal characterictic 1

Chaotic Signal Characterictic(1)

  • Regulated Spectrumby Filtering

  • However, at most,Quasi-Chaos Source

Namhyong et al., Proposal


2 nd order differential equation with 4 5 freedom

2nd Order Differential Equation with 4.5 Freedom

Runge-Kutta Method

x1′= (mF(x5) - X1)/T

x2′=ω22(X1- X3)

x3′=X2 - α2X3

x4′=α2x3′- ω22X5

x5′=X4 - α2X5

x2′′=α2x5′- ω32X7

x3′′=X6 - α2X7

x4′′=α4x3′′-ω32X9

x5′′=X8 - α4X9

Tx1′ + x1 = mF(x5)

x2′′ + α2x2′ + ω22x2= ω22x1

x3′′ + α3x3′ + ω32x3 = α3x2′

x4′′ + α4x4′ + ω42x4 = α4x3′

x5′′ + α5x5′ + ω52x5 = α5x4′

where,

F(x) = |x+e1|-|x-e1|+0.5(|x-e2|- |x+e2|)

  • m=110, 2=0.3, 3=0.7, 4=0.7,

  • 5=0.6, 2=1, 3=0.86, 4=0.73,

  • 5=0.6, T=1.25, e1=0.5, e2=1

Namhyong et al., Proposal


Chaotic signal characterictic 2

Chaotic Signal Characterictic(2)

  • Chaotic Signal directlygenerated from ODE45

  • Direct UWB signal madefrom simple TR & RLCcircuitry analyzable by2nd order differential equation

Namhyong et al., Proposal


Strong features

Strong Features

  • Pros

    • Flat spectrum generated by unpredictable random sequence

    • Nearly infinite resourceful orthogonal code sets

    • Immunity against multipath fading

    • Low complexity and cost circuitry from direct generation of UWB signal

    • Good signal spectrum nature from Bandwidth/Bit rate > 1

Namhyong et al., Proposal


Weak features

WeakFeatures

  • Cons

    • Nearly impossibility of the Same Signal Regeneration

      • Impossible to brew the same signal template in the receiver side

      • Hard to resolve Multiple Access/Simultaneous Operating Piconet and High resolution Range Problem

    • High Sampling Problem from UWB (> 2 GHz)

      • Difficult to apply accurate estimation method

      • Location Awareness/Range Problem

Namhyong et al., Proposal


Contents1

Contents

  • Nature of Chaos Signal

  • DCSK( Differential Chaotic Shift Keying )

  • SOP over Chaos Communication System

  • Range over Chaos Communication System

  • Conclusion

Namhyong et al., Proposal


Dc sk system schematics

TX

  • Direct Chaos Generator

Delay

T/2

Diplexer

-1

Delay

T/2

Integrator

  • Threshold decision

RX

DCSK System Schematics

Namhyong et al., Proposal


Dc sk performance

DCSKPerformance

Namhyong et al., Proposal


Contents2

Contents

  • Nature of Chaos Signal

  • DCSK( Differential Chaotic Shift Keying )

  • SOP over Chaos Communication System

  • Range over Chaos Communication System

  • Conclusion

Namhyong et al., Proposal


Issue on sop of chaos system

Issue on SOP of Chaos system

  • Code Division

    • High Sampling Clock

  • Frequency Division

    • Range Resolution Degradation

  • Time Division

    • No fit in Physical Selection Criterion on Uncoordinated Piconets

Namhyong et al., Proposal


Chaos system block

Data -111-111-11

Data 01101101

Data Bit Frame

생성부

Chaos Signal

생성부

Template

Data 01101101

Chaos 수신단

Chaos System Block

Namhyong et al., Proposal


Transmission

Template Bit

Piconet1

Piconet2

Bit Frame

T1

T1

D11

D11

D1n

D1n

T2

T2

D21

D21

D2n

D2n

T1

D11

D1n

T2

D21

D2n

Transmission

Frame1

Frame2

Namhyong et al., Proposal


Receiver details

Integrator

Data

Z

Template

1 bit Duration

Z

Z

1 1 0 ………. 0

Z

Receiver Details

Namhyong et al., Proposal


Signal processing

Signal Processing

User1

1100111110

Multi_path Channel

User2

1101110110

User3

0100111010

Namhyong et al., Proposal


Contents3

Contents

  • Nature of Chaos Signal

  • DCSK( Differential Chaotic Shift Keying )

  • SOP over Chaos Communication System

  • Range over Chaos Communication System

  • Conclusion

Namhyong et al., Proposal


Loa block diagram

Envelop Detection

&

Signal Point Detection

Serial-to-Parallel

Z-1

Delay Circuit

LOA Block Diagram

Namhyong et al., Proposal


December 2004

Device

Coordinator

Source Time Counter

Source Time Counter

+ Target Time Counter

Source Time Counter

+ Target Time Counter

  • Offset by Comparison between (Source Time Counter - Target Time Counter) & (Source Time Counter - Source2 Time Counter)

  • Distance from (Source Time Counter - Source2 Time Counter)

- Offset

Adjusting Time Counter

By Offset

+ Offset

Confirm Counter

Justification

0

Completion

Namhyong et al., Proposal


Time counter adjust

Device (-2 Offset)

Coordinator

Before : 356

358

After : 364  356+8

374  358+16

1. 366  358 + (16/2)

2. -2  364 – 366

3. +2 Transferred as –Offset

4. 8 Kept for Distance

Time Counter Adjust

Device

PNC

Namhyong et al., Proposal


Location awareness special mode

Location Awareness Special Mode

  • Timing Counter Fine Synchronization

    • PNC disseminates special frame to inform Deviceof Location special mode

    • Device acknowledges with its own timing count

    • PNC compares its own count with Device’s count,and extract an offset between them

    • PNC sends negative offset in order for Device tocompensate its timer

    • Device informs PNC of all being set

Namhyong et al., Proposal


December 2004

Data

Template

Template Frame

Data Frame

∇ X

∇ Y

Envelop Detection

Delay Circuit by 1~3 ns

Namhyong et al., Proposal


Delay circuit

100 MHz

Phase 0

Phase 90

Phase 180

Phase 270

2.5 ns

Delay Circuit

Namhyong et al., Proposal


Simulation bnr 16db

Simulation (BNR 16dB)

Maximum Index ofMoving

Average by duty cycle

Duration will be converted

to distance.

real distance : 0.968 meter

2.5 ns precision distance : 0.750 meter

Error : -0.218 meter

real distance : 13.118 meter

2.5 ns precision distance : 12.750 meter

Error : -0.367 meter

Namhyong et al., Proposal


Conclusion

Conclusion

  • DCSK(Differential Chaotic Shift Keying)Modulation

  • Issues at SOP (Simultaneously Operating Piconet) at Chaos system

  • Location Awareness at Chaos system

Namhyong et al., Proposal


References

References

  • Kolumbán, G., Kennedy, M.P., Jákó, Z. and Kis, G., "Chaotic Communications with Correlator Receivers: Theory and Performance Limits," Special Issue of The IEEE Proceedings on chaotic communications, 2002.

  • Kolumbán, G. and Kennedy, M.P., "Correlator-Based Chaotic Communications: Attainable Noise and Multipath Performance," in "Chaos in Circuits and Systems," (G. Chen editor), Birkhauser, Boston, 2002.

  • Dmitriev A.S., Efremova E.V, and Maksimov N.A. “Controlling the spectrum envelope in single-transistor generator of chaotic oscillations”, Radiotekhnika i elektronika, 2004, vol. 49, no. 2, pp. 222-227 (in Russian).

  • Dmitriev A.S., Kyarginsky B.Ye., Panas A.I., and Starkov S.O., "Experiments on ultra wideband direct chaotic information transmission in microwave band", Int. J. Bifurcation & Chaos, 2003, vol. 13, No. 6, pp. 1495-1507.

Namhyong et al., Proposal


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