January 2005 doc.: IEEE 15-05-0030-00-004a Project: IEEE P802.15 Working Group for Wireless Personal Area Networks ( etworks (WPANs WPANs) ) Project: IEEE P802.15 Working Group for Wireless Personal Area N Submission Title: [Samsung Electronics (SAIT) CFP Presentation] Date Submitted: [4 January, 2005] Source: [(1) Young-Hwan Kim, Chia-Chin Chong, Su Khiong Yong, Jae-Hyon Kim, Seong-Soo Lee (2) A. S. Dmitriev, A. I. Panas, S.O. Starkov, Yu.V. Andreyev, E.V. Efremova, L.V. Kuzmin (3) Haksun Kim, Jaesung Cha] Company: [(1) Samsung Electronics Co., Ltd. (Samsung Advanced Institute of Technology (SAIT)) (2) Institute of Radio Engineering and Electronics (IRE) (3) Samsung Electro-Mechanics Co., Ltd.] Address: [(1) RF Technology Group, Comm. & Networking Lab., P. O. Box 111, Suwon 440-600, Korea. (2) Russian Academy of Sciences, 11 Mokhovaya Street, Moscow 103907, Russia Federation. (3) 314, Maetan-3Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, Korea 443-743] Voice: [+82-31-280-6865], FAX: [+82-31-280-9555], E-Mail: [chiachin.chong@samsung.com] Re: [Response to IEEE 802.15.4a Call for Proposals (04/380r2)] Abstract: [Proposal for the IEEE 802.15.4a PHY standard based on the UWB direct chaotic communications technology.] Purpose: [Proposal for the IEEE 802.15.4a PHY 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. Submission Slide 1 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Samsung Electronics (SAIT) CFP Presentation for IEEE 802.15.4a Alternative PHY UWB Direct Chaotic Communication System Samsung Advanced Institute of Technology (SAIT), Korea Submission Slide 2 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Outline • Characteristics of Chaotic Signal • Principle of Direct Chaotic Communications (DCC) • PHY Layer Proposal • System Performance • Simultaneously Operating Piconets (SOP) • Ranging Technique • Power Consumption & Power Management Modes • Link Budget & Sensitivity • Complexity, Cost & Technical Feasibility • Scalability • Self-Evaluation • Conclusion Submission Slide 3 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Characteristics of Chaotic Signal (1) • Simple circuits – Chaotic signal can be generated directly into the desired microwave band by a chaotic generator • Low cost implementation – The simple circuit leads to low cost product • Multipath resistance – Wideband signal is very immune against multipath fading • Good spectral properties – Non-periodic with a flat (or tailored) spectrum • Flexibility – Chaotic radio pulse with different time duration can have the same bandwidth Submission Slide 4 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Characteristics of Chaotic Signal (2) Amplitude Amplitude PSD, dB PSD, dB Frequency, GHz Frequency, GHz Frequency, GHz Time, ns Time, ns Time, ns Submission Slide 5 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Characteristics of Chaotic Signal (3) t T S(f) f ∆ f t 3T Submission Slide 6 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Direct Chaotic Communication (DCC) • Chaotic source generates oscillations directly in a specified microwave band. • Information component is put into the chaotic carrier using the stream chaotic radio pulses. • Information is retrieved from the chaotic radio pulses without intermediate heterodyning. • Most simple non-coherent receiver is used. Submission Slide 7 Samsung Electronics Co., Ltd. (SAIT)
Direct Chaotic Signal Generation January 2005 doc.: IEEE 15-05-0030-00-004a Direct Chaos Chaotic Radio Pulse Generator Time Signal Binary Information Frequency Spectrum Submission Slide 8 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Chaotic Generator Model Oscillator circuit Experiment device Submission Slide 9 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Chaotic Mathematical Model • 2nd order differential equation implemented by ODE with 4.5 freedom Runge-Kutta Method System Equations y(1) = (m*Fx5 - X1)/T; + = � T x x mF ( x ) y(2) = W1*W1*(X1- X3); 1 1 5 + α + ω = ω 2 2 � � � y(3) = X2 - A1*X3; x x x x 2 2 2 2 2 2 1 y(4) = A2*y3-W2*W2*X5; + α + ω = α � � � 2 � x x x x 3 3 3 3 3 3 2 y(5) = X4 - A2*X5; + α + ω = α � � � 2 � x x x x y(6) = A3*y(5)-W3*W3*X7; 4 4 4 4 4 4 3 + α + ω = α y(7) = X6 - A3*X7; � � � 2 � x x x x 5 5 5 5 5 5 4 y(8) = A4*y(7)-W4*W4*X9; y(9) = X8 - A4*X9; ⎡ − − + ⎤ z e z e = + − − + 2 2 Nonlinearity F ( z ) M ⎢ z e z e ⎥ 1 1 ⎣ ⎦ 2 Submission Slide 10 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Outline • Characteristics of Chaotic Signal • Principle of Direct Chaotic Communications (DCC) • PHY Layer Proposal • System Performance • Simultaneously Operating Piconets (SOP) • Ranging Technique • Power Consumption & Power Management Modes • Link Budget & Sensitivity • Complexity, Cost & Technical Feasibility • Scalability • Self-Evaluation • Conclusion Submission Slide 11 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Frequency Band Plan (1) Spectrum, dBm/MHz GPS 2.4 GHz 5 GHz 0.96-1.61 WLAN, WLAN Power Bluetooth 25 -41.3 1 4 5 6 8 9 10 11 2 3 7 Freq, GHz FCC Spectrum Mask for UWB Submission Slide 12 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Frequency Band Plan (2) • Operating Frequency: 3.1–5.1 GHz • Why Lower Band? – Limitation in the technical capabilities of integrated circuit implementation at higher frequency. – Limit of low cost ICs beyond 6 GHz. – Prevent coexistence with 5 GHz WLAN band. – Use as much bandwidth as possible to maximize the emitted power and follows FCC rules i.e. >500MHz. • Can be easily change to use higher band if necessary or when cheap technologies available in the future. Submission Slide 13 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Frequency Band Plan (3) 4 sub-bands for 4 simultaneously operating piconets (SOPs) Freq, GHz 4 5 3 Freq, GHz 3 4 5 Subband fc, GHz fL, GHz fR, GHz 1 3,35 3,1 3,6 • 500 MHz bandwidth at –10 dB 2 3,85 3,6 4,1 3 4,35 4,1 4,6 • Spaced 500 MHz away 4 4,85 4,6 5,1 Submission Slide 14 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a FCC UWB Emission Mask UWB EIRP Emission Level in dBm Frequency, GHz Submission Slide 15 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Modulation Schemes • Various modulation schemes can be deployed: – On-off-keying (OOK) – Differential-chaos-shift-keying (DCSK) – Pulse-position modulation (PPM) Submission Slide 16 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a Why OOK ? • Advantages: – It has less complexity – It has 3 dB more energy efficiency that PPM & DCSK → battery saving – DCSK waste of 3 dB energy on reference pulses • Disadvantages: – It requires non-zero threshold Submission Slide 17 Samsung Electronics Co., Ltd. (SAIT)
Threshold Estimation January 2005 doc.: IEEE 15-05-0030-00-004a energy-per-bit distributions Once set, threshold is constant! constant energy-per-bit distributions “1” threshold “0” E b / N 0 At maximum distance (i.e. 30 m) → minimum SNR “1” “0” E b / N 0 At minimum distance (i.e. 1 m) → maximum SNR Submission Slide 18 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a DCC-OOK Transmitter & Receiver Transmitter Receiver Multipath (…) 2 Direct Chaos Channel Generator Envelope Threshold detector decision …1001011 Submission Slide 19 Samsung Electronics Co., Ltd. (SAIT)
DCC-OOK Transceiver Architecture (1) January 2005 doc.: IEEE 15-05-0030-00-004a 2 3 Processor Baseband 1 TX RF Part MAC RX RF Part ADC 7 6 5 4 SRAM ; 1 7 3 ; 2 6 4 5 • Very simple modulation scheme: on-off power supply is used for modulation • Additional power saving Submission Slide 20 Samsung Electronics Co., Ltd. (SAIT)
January 2005 doc.: IEEE 15-05-0030-00-004a DCC-OOK Transceiver Architecture (2) Transmitter RF Part Chaotic Power To switch Piconet Oscillator Amplifier Filter Receiver RF Part From switch Envelope Piconet LNA Detector Filter Submission Slide 21 Samsung Electronics Co., Ltd. (SAIT)
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