1. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Multicarrier-UWB] Date Submitted: [3 March 2003] Source: [Ahmed H Tewfik] Company [University of Minnesota] Address [Dept. of Electrical and Computer Engineering, Room 4-174 EECS Bldg.,Minneapolis, MN 55455] Voice:[612-625-6024], FAX: [612-625-4583], E-Mail:[tewfik@ece.umn.edu] Re: [n/a] Response to a Call for Contributions Task Group 3a Call For Intent and Proposals, November 2002, updated January 2003, 02371r0P802-15_SG3a-5_Criteria.doc Abstract:[We propose a multi-carrier UWB system for WPAN communications. We describe system design issues and proposed transmitter and receiver structures. We also provide a self-evaluation of the proposed system.] Purpose:[For consideration by 802.15.3a task group.] 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.

2. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 2 Multicarrier-UWB A.H. Tewfik and E. Saberinia University of Minnesota

3. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 3 Overview Unified view of UWB Multicarrier-UWB Proposed system N-tone sigma-delta modulators Self-evaluation

4. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 4 Unified View of UWB General form Special cases –TM-UWB –DS-UWB –MC-UWB u Tp (t) TpTp x pulse train Info. signal

5. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 5 Unified View of UWB Advantageous to view p(t) as: p(t)= [pulse train]x[spreading sequence] x pulse train Info. signal x FH or DS Spreading sequence

6. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 6 Desirable Attributes Replication in time and frequency domains needed for reliable communications Poor spectral use –Spectral gaps –Spectral shaping due to S(f) x pulse train Info. signal Shaping due to s(t) Baseband signal replicas around Fourier components at f k = k/T u(t) NT 1/NT 1/T

7. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 7 Desirable Attributes Fill the gaps between the spectral lines x pulse train Info. signal Shaping due to s(t) Fill the gaps between spectral lines at f k = k/T u(t) NT 1/NT 1/T

8. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 8 Desirable Attributes MC-UWB Matched filter channel

9. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 9 Desirable Attributes Ambiguity function of p(t) Would like:  p ( ,f)  0 except for the origin ( ,f) =(0,0)

10. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 10 Multicarrier UWB Elemental signal c(n): Costas’ sequence Time resolution: T c /N Frequency resolution: 1/NT

11. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 11 Multicarrier UWB Advantages –Good time and frequency resolution –Time resolution decoupled from elementary pulse duration inter-pulse separation  More flexibility for design

12. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 12 Design Approach Select elementary pulse duration based on peak power and pulse length limitations and desired sidelobe behavior in frequency domain Select inter-pulse separation and number of pulse based on channel spread and average power limitation Select T C to fill available bandwidth

13. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 13 Proposed System TCM-QAM10 tone IFFT 1 bit D/A x Modulation: Carrier + FH spreading data MC-UWB signal System parameters: –N=30, T=9nsec, T s =1nsec, T c =4.5nsec –8 subcarriers with TCM 32-ary QAM –2 Pilots

14. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 14 Transmitter Im( ) Re( ) N-Tone  1 bit D/A X  FH c(n) VCO N-Tone  1 bit D/A X  TCM- QAM I FF T

15. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 15 Proposed System Demodulator 1 bit A/D Pilot correlation 10 tone FFT Costas sequence modulated filterbank AGC Decision data 

16. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 16 Traditional Sigma Delta + 1 bit quantizer + - X(n) y(n)

17. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 17 Traditional Sigma Delta D/A X(t) Multibit X(n) + 1 bit quantizer + - Lowpass Filtering and downsampling oversample Analog switched capacitor implementation

18. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 18 Traditional Sigma Delta D/A X(n) X(t) + 1 bit quantizer + - Analog Lowpass Filtering upsample L 1 bit D/A Higher order  preferred: –Better noise shaping –Eliminate spurious tones

19. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 19 N Tone Sigma Delta + 1 bit quantizer + - X(n) y(n) (e.g., output of N point IFFT)

20. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 20 N Tone Sigma Delta Filter outputs “Instantaneous” Frequency spectrum

21. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 21 N Tone Sigma Delta Average Frequency spectrum

22. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 22 Multiple Piconets Simultaneous operation achieved by proper selection of: –Pulse train p(t) Costas sequence c(n) Time hopping –Carrier frequencies

23. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 23 Self-Evaluation

24. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 24 Self-Evaluation

25. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 25 Self-Evaluation

26. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 26 Self-Evaluation

27. doc.: IEEE 802.15- Submission March 3, 2003 Tewfik/Saberinia, U. of MNSlide 27 Conclusion Multi-carrier UWB offers ability to use traditional baseband modulation schemes and achieve desired performance Implementation simplified by use of N- tone sigma-delta modulators