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Signals and Systems

by: Noemy Blick
Noemy Blick
GPA 3.89

Ivan Howitt

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About this Document

Ivan Howitt
Class Notes
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This 32 page Class Notes was uploaded by Noemy Blick on Sunday October 25, 2015. The Class Notes belongs to ECGR 3111 at University of North Carolina - Charlotte taught by Ivan Howitt in Fall. Since its upload, it has received 13 views. For similar materials see /class/228999/ecgr-3111-university-of-north-carolina-charlotte in Electronics and Computer Technology at University of North Carolina - Charlotte.

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Date Created: 10/25/15
Ultra Wideband Technology for Wireless Communications Presented by Muhammad Safeer Khan Marsaynee Attia 2ng Presentation Overview Introduction Why Ultra Wideband Unique Features UWB Development Modulation Schemes UWB HRWPAN Competing Technologies Conclusion References 0 albLNCQwIARLOTFE INTRODUCTION Common Definitions UWB Fractional Bandwidth fH fLfC gt25 or Total BW gt 10 GHz Narrow Band fH fLfClt1 FCC Definition Fractional bandwidth measured at 10 dB points fH fLfC gt 20 or Total BWgt 500 MHz NB b Power Spectral Density fH MHz INTRODUCTION Transmit and receive an extremely short duration burst of radio frequency energy The resultant waveforms are extremely broadband 80211a 100MHz Part 15 Limit J UWB 75 GHz 39239 39 a 31GHz 572558250Hz 1063Hz Frequency Reference 1 ELNCOIARLOTFE 4 INTRODUCTION The very wideband nature of UWB means that it spans frequencies commonly used as carrier frequencies The UWB signal is carrierless UWB is also known as Impulse or Carrierless radio UWB signal appears as noise to other systems UWB technology at short ranges complements other longer range radio technologies such as WiFi WiMAX and cellular WANs 4 ahLNCOiARLOTFE 5 Introduction Frequencydomain behavior l Timedomain behavior c 9 U I 39 g 8 Q g Frequency E Modulation 8 E 24 GHz L U 0 Z O c 39o g f 3 U 1 o 1 8 9 Impulse 393 g Modulation E E g E time frequency o 3 o n n FCC Min500Mhz n A 3 10 GHz W U W Impulse vs Continuous carriers 6 Why Ultra Wideband Crowding in regulated frequencies 4 regulate IQ If H l l I l I 1 Mm 10 km 100 m 1 m 1L mm H J pm 1 um 33930 Hz 30 kHz quotquotLF LF MF HF VHF UHF SHF EHF infrared visible th UV Reference 1 iBLNCOIARLOITE Why Ultra Wideband Demand for more speed Mbps 5 00 quot 100 300 300 HIE 8021121 I MA 9 I 39 054 L 10 20 30 40 50 60 m1 Reference 2 sir3W 8 Why Ultra Wideband aquot Demand for more speed Wireless Power Range BW Rate tecmnmgy 111W meters bps EDGE 600 2 000 2 OOkHz 3 84 K 250 GSM IXEVDD 600 2000 1 ZSMHZE39 24M 3G CDMA channel 80216 2250 4000 ESMHZAquot 120M WiMax channel 8021 lg 5 0 100 ZSMHZ 54M WiFi channel 802 15 1a 1 10 1 MHzquot lt11 M Bluetoo l Channel V 80215 33 02 10 500111Hzfchame1 ZIOOM J UW B W quot3quotquot IE 7quot W1WJE 9 a 392 Reference 1 Why Ultra Wideband Demand for more in home wireless systems Home application Broadband Broadband Short range DataNoice VideoData connemvny Ac 35 Access t 1 E high throughput T I V wired amp wireless 39 p I g u l Home Theater I Cluster I I Home Office A E Cluster a 1 l quot Long Range E NetworkingConnectivity Control m wired amp wireless 7 I r I i 7V 39 v 39 I Fa Gaming 39 I Family PC Cluster 4 Phone Audio Cluster t Cluster k I r I E 2 quotr laquot inquot quot quot Reference 3 1 LNOOIARLOITE 10 Why Ultra Wideband Potential for other diverse applications Computers and Peripherals Mobile Computing Equipment and Communications Consumer Electronics Why Ultra Wideband Optimal sharing of existing radio spectrum resources rather than looking for new bands T Power spectral density WiHZ Note Drawing not to scale FCCpan 15 lirn i1 Conventional carrier modulation Direct sequence spread spectrum Ultra wideband I Bandwidth Hz GSMEOD GED1718 802111 5754 DECI Bluelooth lEEE 30211a IS 95 GSM 19 HomeRF ETSI Hiperlan AMPS IMT 2 000 802154 ARIE MMAC Ultra wideband I Imus I l l i l l I l l l l 07 09 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 Reference 2 Frequency GHZ s W Unique Features Enhanced capability to penetrate through obstacles Ultra short pulses 0 High data rate 0 Precise location position and ranging capathy Reduction of multipath fading better robustness Unique Features Baseband Transmission Low receiver complexity No up conversion nor down conversion Inherent Security Short pulses for accurate measurement of echo time Minimizes interference with existing technologies Unique Features 0 Enhanced Speed 0 Channel Capacity depends on bandwidth Computed Bandwidths Channel Capacity Bitssec Reference 2 am 15 Unique Features 0 Simple CMOS transmitters at very low power a Suitable for battery operated devices a Low power is CMOS friendly 0 Low duty cycle operation High energy efficiency 0 Low complexity of UWB transceiver Carrier less transmission results in low cost manufacturing Nearly all digital with minimum RF electronics UWB DEVELOPMENT 0 NOT A NEW CONCEPT Goes back 40 years 0 Theoretical background of carrier free waveforms was studied already in the 1960 s 0 In 1989 the name ultra wideband given for devices occupying at least 15 GHz or a 20 dB fractional bandwidth exceeding 25 o In 2002 the FCC ruled for UWB prior to this used only for radar systems and military 0 UWB DEVELOPMENT 0 FCC releases a spectral mask allowing operation of UWB radios at noise floor over substantial bandwidth 0 FCC approved UWB system for the frequency range of 31 106 GHz 0 FCC outlined standards for three types of civilian UWB devices ie Imaging systems Vehicular radar systems Communicationsmeasurement 18 UWB DEVELOPMENT 0 Development becomes Standardization 0 Two competing physical layer specifications Direct Sequence Spread Spectrum DSUWB Multiband Orthogonal Frequency Division Multiplexing OFDM 0 IEEE 802153a UWB Standard 19 UWB COMMUNICATION SYSTEMS Reference 2 113 NUCHARLOTFE 2quot UWB SPECTRAL MASKS FCC Approved Spectral Mask for Hand held UWB Devices 40 JL 9 g ch 1quot 199 7 m 3 1 106 UWB EIRP Emission Level in dBm ch eh m a 39 Handhe ldLimit 7 5 1 31515933 Frequency in GHz 0 NEW Reference 2 21 UWB SPECTRAL MASKS FCC Approved Spectral Mask for Indoor UWB Devices 4039 45 E E 50 1 99 E 31 106 3345 E g g eo E LIN amp 435 E m 39 Indoor Limil g 7u Pan 15 Limit GPS 75 096 161 10quot 10 Frequency in 6H gt Reference 2 UWB MODULATION SCHEMES Carrier vs Impulse Modulation A 39 I 1 I K x I y x I 1 i I U u I nnc hcqncnty Tunc Fluqucuc Baum Reference 2 UWB MODULATION SCHEMES Pulse position modulation PPM BinaryM ary Bipolar Signaling BPSK Pulse Amplitude Modulation PAM OnOff Keying OOK Orthogonal pulse shapes Hermite Polynomials Combinations of the above 0 arbLNCOIARLOTFE 24 UWB MODULATION SCHEMES 0 1 PPM n 1 n U V 39gf quot U39 U Time Nominal Pulse Position 1 O 1 I OOK AA 1 n A Iquot J1 U I U U Time 1 D 1 A PAM JUL rm U W 1 0 1 Ifquot nl IIquot P1 M 39 m n I39 BPSK 3 Iquot U U If H U IL Reference 2 U 4 1397 Modulation Pulse Shaping o Need do pulse shaping in UWB transmitter to match with FCC mask a The most popular choice is the Gaussian shaped pulses and their derivatives o s u 54 i 39 Li quotgalde pulse 7 he 2quot deri ra w c 5 auxga Idoubl J the 3quot derivative 1 aussian pulse 1 c 73975 13 r T w Tmn m J 39 04 05 75 07 D 26 1 15 quot 7 Reference 3 am 26 IEEE 80215 PROJECT project Data Rate Range Configuration Other Features 802151 1 Mbps 10M class 3 8 active device Authentication Bluetooth 100M class 1 Piconet Encryption Voice Scatternet 802153 22 33 44 3050M 256 active device QoS Fast Join High Rate 55 Mbps PiconetMesh MultiMedia 802154 up to 10M nominal MasterSlave Battery Life Low Rate 250Kbps lMIOOM 256 Devices 0r multi month to based on more infinite settings Mesh 80215563a gt100Mbps 10M nominal 256 active device Alternate PiconetMesh 153 PHY 802152 Develop a Coexistence Model and Mechanisms Coexistence Document as a Recommended Practice HEW Reference 3 UWB FOR HRWPAN Bandwidth 1Gbps 100Mbps 1 OMbps 1Mbps Where does UWB fit I 135 2E if z W sm39 Community Km5 Reference 3 LNCCHARLOITE 28 UWB FOR HRWPAN quotquot Graphics lli Fi Digital Internet andio Streaming Video hiultichanncl video video a i I at i c I I LAJV I I at 39 E l 2 t O I quot I 21239 I I Low Data Rate High Data Rate Reference 1 29 KNEW UWB FOR HRWPAN HR WPAN comprise networks with a medium density of active devices per room 5 10 transmitting at up to 100 500 Mbs datarate3 at a distance between 1 and 10 m HRWPAN REQUIREMENTS o Wireless without line of sight limitations 0 Low power consumption 0 Optimized for power management and QoS Ad hoc networking support Multi device networks Cross network interference tolerance Small size and easy integration into variety of devices Low cost amp complexity 1 LNCOIARLOTFE 31


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