doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Multicarrier-UWB] Date Submitted: [8 March 2003] Source: [Ahmed H Tewfik] Company [University of Minnesota] Address [Dept. of Electrical and Computer Engineering, Room EECS Bldg.,Minneapolis, MN 55455] Voice:[ ], FAX: [ ], Re: [03147r0P802-15_TG3a-University-of-Minnesota-CFP-Presentation.ppt] 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 a task group.] Notice:This document has been prepared to assist the IEEE P 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

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 2 Fast Frequency Hopping UWB-OFDM A.H. Tewfik and E. Saberinia University of Minnesota

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 3 Overview FFH-UWB-OFDM: compromise between multi-UWB and pure OFDM Proposed System System comparisons and design trade-offs Transmitter and Receiver Structure Link Budget Performance of the System Coexistence and Multiple piconets Complexity and Power Consumption D/A and A/D structure Conclusion

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 4 Multi-Carrier UWB Multi-band UWB – Need multiple band transmitter –Need a block of analog matched filters Pure OFDM UWB –No need for Rake receiver –Need heavy coding to extract frequency diversity –Long FFT and IFFT FFH-UWB-OFDM (some where between!) –No need for Rake receiver –Implemented short IFFT and FFT technology –Extract multipath diversity and use smaller number of Subcarriers

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 5 An FFH-UWB-OFDM Block Make an OFDM block with N-IFFT of QAM symbols (N=32) Create a base band signal with bandwidth W> 500 MHz and Duration T u ns Tu t f(MHz) W 0

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 6 An FFH-UWB-OFDM Block Fast frequency hopping inside the block to achieve multipath resolution and frequency spreading Avoid UNII band –Use only GHz (Lower Band System) –Use whole band and avoid GHz (Whole Band System)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 7 Frequency Hopping for Lower Band System t(ns) f(GHz)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 8 Frequency Hopping for Whole Band System t(ns) f(GHz)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 9 An FFH-UWB-OFDM Block Repeat this block every T=12.8ns N=32 times f(GHz) t(ns)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 10 Spectrum Bandwidth=1.65GHz Multipath resolution=0.6ns Bandwidth=7.5GHz Multipath resolution=0.13ns

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 11 Proposed System N=32 Subcarrier ¾ Convolutional Channel Coding QAM Constellation: QPSK: 110 Mbit/s 16-QAM: 220 Mbit/s 64-QAM: 480 Mbit/s

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 12 Transmitter Frequency Hopping PAM signal X ¾ Convlution Code I FF T Input rate= M sample/s Sample and Hold for Ts= 5.45 ns Interleaving QAM Mapping

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 13 Receiver LPF  1 bit A/D X  SYNC VCO LPF  1 bit A/D X  AGC P*(n) X X Decision Bit mapping Decision exp(j..) X X     pilot Info. Bearing carrier

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 14 Link Budget Whole Band System Lower Band System

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 15 BER vs SNR for CM3

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 16 BER vs SNR for CM4

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 17 Bit rate versus Distance

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 18 Bit rate versus Distance

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 19 Bit rate versus Distance

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 20 Coexistence

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 21 Multiple Piconets Simultaneous operation achieved by proper selection of: –Different FH code (for whole band system) –Use of piconet dependent pilots –Combination of above

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 22 Pilot Assisted Demodulation MF Correlator Energy Detector Decision Energy Detector Information bearing carrier Pilot r(t) pilots Information bearing carriers MF

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 23 Transmitter Complexity and Power Consumption

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 24 Receiver Complexity and Power Consumption

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 25 Traditional Sigma Delta + 1 bit quantizer + - X(n) y(n)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 26 Traditional Sigma Delta A/D X(t) Multibit X(n) + 1 bit quantizer + - Lowpass Filtering and downsampling oversample Analog switched capacitor implementation

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 27 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

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 28 N Tone Sigma Delta + 1 bit quantizer + - X(n) y(n) (e.g., output of N point IFFT)

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 29 N Tone Sigma Delta Filter outputs “Instantaneous” Frequency spectrum

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 30 N Tone Sigma Delta Average Frequency spectrum

doc.: IEEE Submission May 5, 2003 Tewfik/Saberinia, U. of MNSlide 31 Conclusion FFH-UWB-OFDM provides a compromise between pure OFDM and Multi-band UWB It avoids Rake type receiver with reasonable size FFT-IFFT Low complexity transmitter and receiver structures possible