December 2004 doc IEEE 802 15 doc Project

December 2004 doc. : IEEE 802. 15 -<doc#> Project: IEEE P 802. 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: namhyong. kim@samsung. com Re: [Response to Call for Proposals] Abstract: Purpose: [Proposing a PHY-layer interface for standardization by 802. 15. 4 a] Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission Namhyong et al. , Proposal

December 2004 doc. : IEEE 802. 15 -<doc#> 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 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Contents • • • Nature of Chaos Signal DCSK ( Differential Chaotic Shift Keying ) SOP over Chaos Communication System Range over Chaos Communication System Conclusion Submission Namhyong et al. , Proposal

December 2004 doc. : IEEE 802. 15 -<doc#> Chaotic Source • Pseudo-random Sequence • Ordinary Differential Equation Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Pseudo-Random Sequence • Pseudo-Chaos Signal Generator – Pseudo-random Sequence filtered by Chebyshev Type I • Pseudo-random numbers ranging between -1. 0 to +1. 0 • Chebyshev Specification – – Submission Passband : 0. 15 < f < 0. 25 Stopband : f < 0. 14 or 0. 28 < f Ws Attenuation : 15 d. B Wp Ripple : 1 d. B Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Chaotic Signal Characterictic(1) • Regulated Spectrum by Filtering • However, at most, Quasi-Chaos Source Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 2 nd Order Differential Equation with 4. 5 Freedom Runge-Kutta Method Tx 1′ + x 1 = m. F(x 5) x 2′′ x 3′′ x 4′′ x 5′′ + + α 2 α 3 α 4 α 5 x 2′ x 3′ x 4′ x 5′ + + ω22 x 2 ω32 x 3 ω42 x 4 ω52 x 5 = = ω22 x 1 α 3 x 2′ α 4 x 3′ α 5 x 4′ where, F(x) = ｜x+e 1｜- ｜x-e 1｜+0. 5(｜x-e 2｜- ｜x+e 2｜) 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, e 1=0. 5, e 2=1 Submission x 1′= (m. F(x 5) - X 1)/T x 2′= ω22(X 1 - X 3) x 3′= X 2 - α 2 X 3 x 4′= α 2 x 3′- ω22 X 5 x 5′= X 4 - α 2 X 5 x 2′′= α 2 x 5′- ω32 X 7 x 3′′= X 6 - α 2 X 7 x 4′′= α 4 x 3′′-ω32 X 9 x 5′′= X 8 - α 4 X 9 Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Chaotic Signal Characterictic(2) • Chaotic Signal directly generated from ODE 45 • Direct UWB signal made from simple TR & RLC circuitry analyzable by 2 nd order differential equation Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 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 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Weak Features • 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 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Contents • • • Nature of Chaos Signal DCSK ( Differential Chaotic Shift Keying ) SOP over Chaos Communication System Range over Chaos Communication System Conclusion Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 DCSK System Schematics TX Direct Chaos Generator Delay T/2 Threshold decision Integrator Diplexer -1 Delay T/2 RX Submission Namhyong et al. , Proposal

December 2004 doc. : IEEE 802. 15 -<doc#> DCSK Performance Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Contents • • • Nature of Chaos Signal DCSK ( Differential Chaotic Shift Keying ) SOP over Chaos Communication System Range over Chaos Communication System Conclusion Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 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 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Chaos System Block Data -111 -11 Data 01101101 Data Bit Frame 생성부 Chaos Signal 생성부 Template Data 01101101 Chaos 수신단 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Transmission Frame 1 T 1 D 1 n T 2 D 21 D 2 n Frame 2 T 1 D 1 n T 2 D 21 D 2 n Template Bit Piconet 1 Piconet 2 Bit Frame Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Receiver Details Integrator Data 1 bit Duration Template Z 1 1 0 ………. 0 Z Z Z Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Signal Processing User 1 1100111110 Multi_path Channel User 2 110110 User 3 0100111010 Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Contents • • • Nature of Chaos Signal DCSK ( Differential Chaotic Shift Keying ) SOP over Chaos Communication System Range over Chaos Communication System Conclusion Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 LOA Block Diagram -1 Z Serial-to-Parallel Envelop Detection & Signal Point Detection Delay Circuit Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Device Coordinator Source Time Counter 1. 2. Offset by Comparison between (Source Time Counter Target Time Counter) & (Source Time Counter - Source 2 Time Counter) Distance from (Source Time Counter - Source 2 Time Counter) Confirm Counter Justification Source Time Counter + Target Time Counter - Offset + Offset Adjusting Time Counter By Offset 0 Completion Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Time Counter Adjust Device (-2 Offset) Coordinator Device PNC Before : 356 After : 364 356+8 358 374 358+16 1. 2. 3. 4. Submission 366 358 + (16/2) -2 364 – 366 +2 Transferred as –Offset 8 Kept for Distance Namhyong et al. , Proposal

December 2004 doc. : IEEE 802. 15 -<doc#> Location Awareness Special Mode 1. Timing Counter Fine Synchronization 1. PNC disseminates special frame to inform Device of Location special mode 2. Device acknowledges with its own timing count 3. PNC compares its own count with Device’s count, and extract an offset between them 4. PNC sends negative offset in order for Device to compensate its timer 5. Device informs PNC of all being set Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Template Frame Data Frame ∇X ∇Y Data Envelop Detection Template Delay Circuit by 1~3 ns Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Delay Circuit 100 MHz Phase 0 Phase 90 Phase 180 Phase 270 2. 5 ns Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Simulation (BNR 16 d. B) Maximum Index of Moving Average by duty cycle Duration will be converted to distance. real distance : 13. 118 meter 2. 5 ns precision distance : 12. 750 meter Error : -0. 367 meter Submission real distance : 0. 968 meter 2. 5 ns precision distance : 0. 750 meter Error : -0. 218 meter Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 Conclusion • DCSK (Differential Chaotic Shift Keying) Modulation • Issues at SOP (Simultaneously Operating Piconet) at Chaos system • Location Awareness at Chaos system Submission Namhyong et al. , Proposal

doc. : IEEE 802. 15 -<doc#> December 2004 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. Submission Namhyong et al. , Proposal