doc.: ieee 802.15-05-0042-00-004a submission january 2005 namhyong et al., proposal slide 1 project:...
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January 2005
Namhyong et al., ProposalSlide 1
doc.: IEEE 802.15-05-0042-00-004a
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: Samsung DM R&D Center ProposalDate Submitted: XX December, 2004Source: Namhyong Kim et al., Samsung Electronics Digital Media R&D CenterAddress 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.
January 2005
Namhyong et al., ProposalSlide 2
doc.: IEEE 802.15-05-0042-00-004a
Submission
Samsung DM R&D Center Proposal
Multiple Access and Range Methodology
for Chaos DCSK System
Namhyong Kim, Inhwan Kim
Samsung Electronics Co., Ltd.
DM R&D Center
January 2005
Namhyong et al., ProposalSlide 3
doc.: IEEE 802.15-05-0042-00-004a
Submission
Contents
• Overview• Chaotic System Simulator
– Chaotic Sources
– DCSK ( Differential Chaotic Shift Keying )
• Issues result from Chaos Signal• Range Estimation based on Chaos Signal• Conclusion
January 2005
Namhyong et al., ProposalSlide 4
doc.: IEEE 802.15-05-0042-00-004a
Submission
Overview
• Chaotic Communication Simulator– System Parameters
– Chaotic Source
– Modulation
• Issues– Simultaneously Operating Piconets
• Range Estimation– High precision Distance Measurement by TOA
January 2005
Namhyong et al., ProposalSlide 5
doc.: IEEE 802.15-05-0042-00-004a
Submission
Contents
• Overview• Chaotic System Simulator
– Chaotic Sources
– DCSK ( Differential Chaotic Shift Keying )
• Issues result from Chaos Signal• Range Estimation based on Chaos Signal• Conclusion
January 2005
Namhyong et al., ProposalSlide 6
doc.: IEEE 802.15-05-0042-00-004a
Submission
Simulation Parameters
• Frequency Band– Bandwidth : 2 GHz
– Center Frequency : 4 GHz
• Bit Frame– 1 bit time frame : 200 ns (5 MHz)
– Duty Cycle : 50 % (100 ns)
• Sampling– Simulation Sampling Frequency: 40 GHz
January 2005
Namhyong et al., ProposalSlide 7
doc.: IEEE 802.15-05-0042-00-004a
Submission
Chaotic Sources
• Pseudo-random Sequence• Ordinary Differential Equation
January 2005
Namhyong et al., ProposalSlide 8
doc.: IEEE 802.15-05-0042-00-004a
Submission
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
January 2005
Namhyong et al., ProposalSlide 9
doc.: IEEE 802.15-05-0042-00-004a
Submission
Chaotic Signal Characterictic(1)
• Regulated Spectrumby Filtering
• However, at most,Quasi-Chaos Source
January 2005
Namhyong et al., ProposalSlide 10
doc.: IEEE 802.15-05-0042-00-004a
Submission
2nd Order Differential Equation with 4.5 Freedom
Tx1′ + x1 = mF(x5)
x2′′ + α2 x2′ + ω22x2 = ω2
2x1 x3′′ + α3 x3′ + ω3
2x3 = α3 x2′ x4′′ + α4 x4′ + ω4
2x4 = α4 x3′x5′′ + α5 x5′ + ω5
2x5 = α5 x4′
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
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
January 2005
Namhyong et al., ProposalSlide 11
doc.: IEEE 802.15-05-0042-00-004a
Submission
Chaotic Signal Characterictic(2)
• Chaotic Signal directlygenerated from ODE45
• Direct UWB signal madefrom simple TR & RLCcircuitry analyzable by2nd order differential equation
January 2005
Namhyong et al., ProposalSlide 12
doc.: IEEE 802.15-05-0042-00-004a
Submission
Modulation
• Differential Chaotic Shift Keying
January 2005
Namhyong et al., ProposalSlide 13
doc.: IEEE 802.15-05-0042-00-004a
Submission
DCSK System Schematics
Delay
T/2
Threshold decision Integrator
/ 2( )
Tdt
Direct Chaos Generator
Delay
T/2-1
RX
TX
Diplexer
January 2005
Namhyong et al., ProposalSlide 14
doc.: IEEE 802.15-05-0042-00-004a
Submission
Differential Operation
Template Bit Info Bit
Original Frame
Half bit duration Delayed Frame
Multiplication
Half bit duration
Integration
1
0
January 2005
Namhyong et al., ProposalSlide 15
doc.: IEEE 802.15-05-0042-00-004a
Submission
Time Slot Jittered
No Jitter
200 ps Jitter
300 ps Jitter
January 2005
Namhyong et al., ProposalSlide 16
doc.: IEEE 802.15-05-0042-00-004a
Submission
DCSK Performance (32 Octet)
BER PER (200 Frames)
January 2005
Namhyong et al., ProposalSlide 17
doc.: IEEE 802.15-05-0042-00-004a
Submission
Contents
• Overview• Chaotic System Simulator
– Chaotic Sources
– DCSK ( Differential Chaotic Shift Keying )
• Issues result from Chaos Signal• Range Estimation based on Chaos Signal• Conclusion
January 2005
Namhyong et al., ProposalSlide 18
doc.: IEEE 802.15-05-0042-00-004a
Submission
Strong Features
• Flat spectrum generated by unpredictable genuine random sequence
• Nearly infinite resourceful orthogonal code sets • Immunity against multi-path fading• Low complexity and cost circuitry from direct
generation of UWB signal• Good signal spectrum nature from
Bandwidth/Bit rate > 1
January 2005
Namhyong et al., ProposalSlide 19
doc.: IEEE 802.15-05-0042-00-004a
Submission
Weak Features
• 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
January 2005
Namhyong et al., ProposalSlide 20
doc.: IEEE 802.15-05-0042-00-004a
Submission
SOP options for Chaos System
• Code Division– High Sampling Clock– High Cost and Overhead
• Frequency Division– Range Resolution Degradation– Almost only solution for 3 ~ 4 piconets in 3 ~ 5 GHz band
• Time Division– No fit in SOP Physical Selection Criterion
due to Uncoordinated Piconets– Possible solution under Assumption of Global
time synchronization & low duty cycle
January 2005
Namhyong et al., ProposalSlide 21
doc.: IEEE 802.15-05-0042-00-004a
Submission
Time Division SOP
January 2005
Namhyong et al., ProposalSlide 22
doc.: IEEE 802.15-05-0042-00-004a
Submission
System Block
Data Bit FrameGenerator
Chaos SignalGenerator
Data 01101101
Data -111-111-11
Template
Chaos Receiver
Data 01101101
January 2005
Namhyong et al., ProposalSlide 23
doc.: IEEE 802.15-05-0042-00-004a
Submission
Piconet1
Piconet2
Template Bit
Bit Frame
Transmission
T1 D1nD11 T2 D2nD21T1 D1nD11 T2 D2nD21
D11 D2nD21D1nT1 T2
Frame1
Frame2
January 2005
Namhyong et al., ProposalSlide 24
doc.: IEEE 802.15-05-0042-00-004a
Submission
Receiver Details
Template
Data
1 1 0 ………. 0 1 bit Duration
∫
Integrator
Z
Z
Z
Z
January 2005
Namhyong et al., ProposalSlide 25
doc.: IEEE 802.15-05-0042-00-004a
Submission
Signal Processing
User11100111110
User21101110110
User30100111010
Multi_path Channel
January 2005
Namhyong et al., ProposalSlide 26
doc.: IEEE 802.15-05-0042-00-004a
Submission
Contents
• Overview• Chaotic System Simulator
– Chaotic Sources
– DCSK ( Differential Chaotic Shift Keying )
• Issues result from Chaos Signal• Range Estimation based on Chaos Signal• Conclusion
January 2005
Namhyong et al., ProposalSlide 27
doc.: IEEE 802.15-05-0042-00-004a
Submission
Range Block Diagram
Envelop Detection&
Signal Point DetectionZ-1 Serial-to-Parallel
Delay Circuit
January 2005
Namhyong et al., ProposalSlide 28
doc.: IEEE 802.15-05-0042-00-004a
Submission
Coordinator Device
Source Time Counter+ Target Time Counter
Source Time Counter
Source Time Counter+ Target Time Counter1. Offset by
Comparison between (Source Time Counter - Target Time Counter) & (Source Time Counter - Source2 Time Counter)
2. Distance from (Source Time Counter - Source2 Time Counter)
- Offset
+ Offset
0
Adjusting Time CounterBy Offset
Confirm CounterJustification
Completion
January 2005
Namhyong et al., ProposalSlide 29
doc.: IEEE 802.15-05-0042-00-004a
Submission
Time Counter Adjust Example
Initial : 356 358
Device (-2 Offset) Coordinator
1st Pass : 364 356+8 374 358+161. PNC recalculates Device Arrival time : 366 358 + (16/2)2. Compare value from 1 and Device : -2 364 – 3663. +2 Transferred as –Offset4. 8 Kept for Distance between PNC and Device
January 2005
Namhyong et al., ProposalSlide 30
doc.: IEEE 802.15-05-0042-00-004a
Submission
Location Awareness Special Mode
1. Timing Counter Fine Synchronization1. PNC disseminates special frame to inform Device
of Location special mode2. Device acknowledges with its own timing count3. PNC compares its own count with Device’s count,
and extract an offset between them4. PNC sends negative offset in order for Device to
compensate its timer5. Device informs PNC of all being set
January 2005
Namhyong et al., ProposalSlide 31
doc.: IEEE 802.15-05-0042-00-004a
Submission
∇ X
∇ Y
Template Frame Data Frame
Data
Template
Envelop Detection
Delay Circuit by 1~3 ns
January 2005
Namhyong et al., ProposalSlide 32
doc.: IEEE 802.15-05-0042-00-004a
Submission
Fine Precision TOA Estimation
• Suggest Special mode different from Normal mode, which needs faster clock
• In special mode, Estimate how far Signal detached from fixed time slot with finer clock
• This obtained value returned with Response
command to Request command from MAC
January 2005
Namhyong et al., ProposalSlide 33
doc.: IEEE 802.15-05-0042-00-004a
Submission
Delay Circuit
Phase 0
Phase 90
Phase 180
Phase 270
100 MHz
2.5 ns
January 2005
Namhyong et al., ProposalSlide 34
doc.: IEEE 802.15-05-0042-00-004a
Submission
Simulation (BNR 16dB)
real distance : 0.968 meter2.5 ns precision distance : 0.750 meterError : -0.218 meter
real distance : 13.118 meter2.5 ns precision distance : 12.750 meterError : -0.367 meter
Maximum Index of Moving Average by duty cycleDuration will be convertedto distance.
January 2005
Namhyong et al., ProposalSlide 35
doc.: IEEE 802.15-05-0042-00-004a
Submission
Conclusion
• Chaotic Communication System Simulator– Source Generation
– DCSK modulation
• Chaos System Issues– Chaos Signal Features
– SOP solutions
• Ranging– Fine distance estimation by using Chaos Signal
January 2005
Namhyong et al., ProposalSlide 36
doc.: IEEE 802.15-05-0042-00-004a
Submission
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.