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UWB (Ultra Wideband) Communication System

UWB (Ultra Wideband) Communication System. 長庚電機通訊組 碩一 張晉銓 指導教授 : 黃文傑博士. Outline. Introduction to UWB Application of UWB UWB Spectrum FCC UWB Emission Limit Avoiding Interfering With Other Users Conclusion. UWB and 60 GHz radios potentially extend the

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UWB (Ultra Wideband) Communication System

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  1. UWB (Ultra Wideband) Communication System 長庚電機通訊組 碩一 張晉銓 指導教授:黃文傑博士

  2. Outline • Introduction to UWB • Application of UWB • UWB Spectrum • FCC UWB Emission Limit • Avoiding Interfering With Other Users • Conclusion

  3. UWB and 60 GHz radios potentially extend the range of application of radio technology 60 GHz WLAN 802.11a 60 GHz Pt.-to-Pt. 802.11b Bluetooth Cellular 0.1 1 10 100 1 G UWB HDTV motion picture, Pt.-to-Pt. links 100 M NTSC video; rapid file transfer 10 M Peak Data Rate (bps) MPEG video; PC file transfer 1 M 3G Voice, Data 100 k ZigBee UWB 10 k Carrier Frequency (GHz)

  4. Introduction to UWB 1/4 - Technology - • Extremely short pulses in the time domain • Large bandwidth in the frequency domain • Fractional bandwidth=(fH-fL)/fC> 25% • or total bandwidth > 1,5 GHz F Amplitude Amplitude S frequency / Hz time / s B

  5. Introduction to UWB 2/4 - Technology- advantage • High data rates • Low transmission power (Bluetooth:1Mbps,10m,1mW UWB: 1Mbps,10m,10㎼) • Multipath immunity • Simple implementation, low cost • High spatial capacity (bps/m2) • disadvantage • Short operating ranges • Interference with other licensed, ”narrowband” systems

  6. Introduction to UWB 3/4 - Regulations - • FCC(Federal Communication Commission) approved the sale of UWB products in the United States under certain limits in February 2002 • UWB devices are allowed to work on very low power levels to avoid interference

  7. Introduction to UWB 4/4 - Applications - • Automotive collision-detection systems • Medical imaging • Through-wall imaging • Ground-penetrating radar • Communications devices

  8. Communications Backbone Last 100 meters Building-to-Building Ad Hoc Video Links XBC 60 GHz Beams In-Building Backbone and/or LAN Highway Applications Application Scenarios

  9. GPS UWB Spectrum Bluetooth, 802.11b Cordless Phones Microwave Ovens • FCC ruling permits UWB spectrum overlay 802.11a Emitted Signal Power PCS “Part 15 Limit” -41 dBm/Mhz UWB Spectrum 1.6 1.9 2.4 3.1 5 10.6 Frequency (Ghz) • FCC ruling issued 2/14/2002 after ~4 years of study & public debate • FCC believes current ruling is conservative

  10. FCC UWB Emission Limit for Outdoor Handheld Systems

  11. FCC UWB Emission Limit For Indoor Systems

  12. Information Modulation Pulse length <1ns; Energy concentrated in 2-6GHz band; Power < 10uW • Pulse Position Modulation (PPM) • Pulse Amplitude Modulation (PAM) • On-Off Keying (OOK) • Bi-Phase Modulation (BPSK)

  13. Main data modulation schemes used for UWB systems • Time hopping pulse position modulation (TH-PPM) • Direct spread code division multiple access (DS-CDMA) • Subband (SB) UWB (Intal)

  14. Avoiding Interfering With Other Users Co-existence through very low power transmission: Operate so that aggregate Interference from UWB Transmissions is “Undetectable” (or Has Minimal Impact) to Narrow-Band Receivers. UWB Thermal (kT) Noise Floor

  15. ADC GAIN CLK DIGITAL TX Conclusion • High spatial capacity (bps/m2) • Low power (Bluetooth:1Mbps,10m,1mW UWB: 1Mbps,10m,10㎼) 3. Low cost, simple implementation • multi-user interference • multiple-accessinterference • Synchronization problems • The hardware problem of high frequency in unlicensed band EX:>5GHz

  16. End • Thank you for your attention

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