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 Carrier Frequency (GHz) Peak Data Rate (bps) 1 G 100 M 10 M 1 M 100 k 10 k HDTV motion picture, Pt.-to-Pt. links NTSC video; rapid file transfer MPEG video; PC file transfer Voice, Data Cellular 3G 802.11b 60 GHz Pt.-to-Pt. 60 GHz WLAN Bluetooth 0.1110100 802.11a ZigBee UWB

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

5. Introduction to UWB 2/4 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/m 2 ) - Technology- disadvantage Short operating ranges Interference with other licensed, ”narrowband” systems

6. Introduction to UWB 3/4 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 - Regulations -

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

8. Application Scenarios

9. UWB Spectrum FCC ruling permits UWB spectrum overlay 1.61.92.4 Bluetooth, 802.11b Cordless Phones Microwave Ovens GPS PCS 5 802.11a -41 dBm/Mhz “Part 15 Limit” UWB Spectrum Frequency (Ghz) Emitted Signal Power 10.6 3.1  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 Position Modulation (PPM) Pulse Amplitude Modulation (PAM) On-Off Keying (OOK) Bi-Phase Modulation (BPSK) Pulse length <1ns; Energy concentrated in 2-6GHz band; Power < 10uW

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. Conclusion 1.High spatial capacity (bps/m 2 ) 2.Low power (Bluetooth:1Mbps,10m,1mW UWB: 1Mbps,10m,10 ㎼ ) 3.Low cost, simple implementation 4.multi-user interference 5.multiple-access interference 6.Synchronization problems 7.The hardware problem of high frequency in unlicensed band EX:>5GHz GAIN TX CLK ADC DIGITAL

16. End Thank you for your attention