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

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Chaotic Optional UWB Signal Date Submitted: Nov. 11 2005 Source: (1) Jae-Hyon Kim, Min-Seop Jeong, Young-Hwan Kim, Seong-Soo Lee, Ki-Soo Chang (2) Changsoo Yang, Haksun Kim Company: (1) Samsung Electronics Co., Ltd. (Samsung Advanced Institute of Technology (SAIT)) (2) Samsung Electro-Mechanics Co., Ltd. (SEMCO) Address: (1) San 14-1, Nongseo-ri, Giheung-eup, Yongin-si, Gyeonggi-do, Korea 449-712 (2) 314, Maetan-3Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, Korea 443-743 Voice: [+82-31-280-9663], FAX: [+82-31-280-9569], E-Mail: [ jae.kim@samsung.com] Re: []Abstract: [Chaotic signal source]Purpose: [To propose the inclusion of Chaotic signal source as an optional signal for the IEEE 802.15.4a 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. Jae-Hyon Kim (SAIT)

2. Chaotic Optional UWB Signal Jae-Hyon Kim Samsung Advanced Institute of Technology (SAIT) Jae-Hyon Kim (SAIT)

3. Objective • To include Chaotic signal source as an UWB optional waveform in the 802.15.4a standard • Chaotic waveform is an optional waveform in the standard baseline • Chaotic can be low cost and ultra-low power signal source that can satisfy the TG4a Technical Requirement • Power Consumption (From TG4a Technical Requirement) • -The device (complete communication system including alt-PHY and MAC) must operate while supporting a battery life of months or years without intervention. • -Therefore very efficient power saving modes are desirable, in particular for devices that transmit sporadically. In addition the coordination of nodes must not induce frequent wake up of nodes. These mechanisms must be supported by the alt-PHY layer. Jae-Hyon Kim (SAIT)

4. Baseline • In March 2005, the baseline specification was selected (without enacting down-selection procedures) The baseline with 100% approval. • In the baseline, Chaotic waveform was determined as an optional waveform in UWB band • Chaotic waveform and SOP mechanisms for homogeneous (chaos-only) networks Jae-Hyon Kim (SAIT)

5. Proposed Impulse + Chaotic (Optional) Solid Line: Mandatory sub-systems Dashed Line: Optional sub-systems 4.5 GHz LO Preamble Ternary Scrambler BPSK. MOD MUX Preamble Data Impulse S/W S/W RF Chaotic Data FEC Scrambler Code1 Cross Correlator S / W Decision BPSK . DEMOD LPF Code2 Cross Correlator S/W S/W Decoder Descrambler RF Non-coherent Detector Differential or Non-coherent Chaotic Detector Jae-Hyon Kim (SAIT)

6. Proposed Impulse + Chaotic (Optional) For accurate application (coherent case) Impulse Detector Data FEC Scrambler Preamble Impulse Decoder Descrambler RF RF Chaotic Chaotic Detector For power saving application Impulse Detector Data FEC Scrambler Preamble Impulse Decoder Descrambler RF RF Chaotic Chaotic Detector Jae-Hyon Kim (SAIT)

7. Band No. 4 111 MHz 207 MHz 1 2 3 3 4 5 GHz 4.75 3.25 3.5 3.75 4.25 4.5 Band Plan TG4a Draft Chaotic Signal can meet the TG4a Draft Band Plan very simply => Chaotic Pulse Length (Pulse Duration) doesn’t alter spectral shape or bandwidth Chaotic Jae-Hyon Kim (SAIT)

8. PRI VPeak Ts TC Preamble Modulation & PRF Ternary Modulation, Peak Preamble PRF = ~ 31 MHz (actually ~ 494/16) TG4a Draft Ternary Ts =~ 2 nsec. => Chip duration ≈ 2 ns (2.024291 ns) -PRF of Chaotic pulse length(Ts) can be changed flexibly without altering the spectral shape or bandwidth -In case of preamble modulation: One single Impulse Radio maps to one Differential Chaotic Pulse (+) => Ref & (+Ref) (-) => Ref & (-Data) (0) => 0 Chaotic Ternary Ts Ts =~ 30 nsec. => Chip duration ≈ (1/31MHz) Jae-Hyon Kim (SAIT)

9. Data Modulation & PRF Ts = 32.4 ns S FEC+Modulation: RS+1/2CC+2PPM&BPSK or RS+3/4CC+8PPM&BPSK. Peak PRF: 494 MHz or 247 MHz. TG4a Draft BPSK Ex: Average Data PRF ~ 16 MHz, 1uS => 16 pulses -In case of Data Modulation: One Burst Impulse Radio or a sequence maps to one Differential Chaotic Pulse (+) => Ref & (+Data) (-) => Ref & (-Data) Chaotic Binary Ts =~ 32 nsec. Ts Jae-Hyon Kim (SAIT)

10. Conclusion • Chaotic Source is a very low cost and low power signal generator and it can be used for power saving applications • The Chaotic pulse length can be determined flexibly without altering the bandwidth • No modification is required in the scheme and parameters (impulse radio based preamble, PRF, modulation, and FEC) determined so far in TG4a for UWB band • It supports Ternary for preamble, Binary and PPM for data modulation => Chaotic Source can be included in the standard as an optional signal source • Reference (Chaotic) • doc.: IEEE 15-05-0030-02-004a • doc.: IEEE 15-05-0132-03-004a • doc.: IEEE 15-05-0315-00-004a • doc.: IEEE 15-05-0316-00-004a • doc.: IEEE 15-05-0451-00-004a Jae-Hyon Kim (SAIT)