Meixia Tao Introduction To Wireless Communications And Recent Advances

Introduction to Wireless Communications and Recent Advances Meixia (Melissa) Tao Associate Professor, PhD Dept. of Electronic Engineering Shanghai Jiao Tong University April 18, 2008

Outline ,[object Object],[object Object],[object Object]

Basic Elements of a Comm. System Input transducer Source encoder Channel encoder Modulator Channel De- modulator Channel decoder Source decoder Output transducer Transmitter Receiver Noise Information source Output message

Source Coding ,[object Object],[object Object],[object Object],[object Object]

Channel Coding ,[object Object],[object Object],[object Object],[object Object]

Modulator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transmission Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Broadcast radio, TV Walkie-Talkies Telephone networks

Transmission Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],00011011110

Wireless Radio Channel ,[object Object],[object Object]

Radio Spectrum ,[object Object],Frequency 30-300Hz SLF 300-3kHz ULF 3k-30kHz VLF 30k-300kHz LF 300k-3MHz MF 3M-30MHz HF 30M-300MHz VHF 300M-3GHz UHF 3G-30GHz SHF 30G-300GHz EHF Infrared 6000 GHz Light X-ray Gamma-ray Usage Broadcast AM Paging/TV/Broadcast FM Mobile phones / WLAN Radars Remote control Camera Medicine

Spectrum Regulation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Licensed Spectrum Allocation in US Service/system Frequency span AM radio 535-1605 kHz FM radio 88-108 MHz Broadcast TV 54-88 MHz, 174-216 MHz, 470-806 MHz Broadband wireless 746-764 MHz, 776-794 MHz 3G systems 1.7-1.85MHz, 2.5-2.69 MHz 1G and 2G cellular phones 806-902 MHz, 1.85-1.99 GHz Satellite digital radio 2.32-2.325 GHz Multichannel multipoint distribution service (MMDS) 2.15-2.68 GHz Digital broadcast satellite (Satellite TV) 12.2-12.7 GHz Local multipoint distribution service (LMDS) 27.5-29.5 GHz, 31-31.3 GHz Fixed wireless services 38.6-40 GHz

Unlicensed Spectrum Allocation in US Band Frequency ISM band I (Cordless phones, 1G WLAN) 902-928 MHz ISM band II (Bluetooth, 802.11b/g WLAN 2.4-2.4835 GHz U-NII band I (Indoor systems, 802.11a WLAN) 5.15-5.25 GHz U-NII band II (short-range outdoor systems, 802.11a WLAN) 5.25-5.35 GHz U-NII band II (Long-range outdoor systems, 802.11a WLAN) 5.725-5.825 GHz

Radio Wave Propagation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],200 meters 100 meters Receives 1/4 of the power

Radio Wave Propagation ,[object Object],[object Object],[object Object],[object Object],200m 100m

Multiple Access Techniques FDMA TDMA CDMA

Current Wireless Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Evolution of Mobile Phone Systems ,[object Object],[object Object],[object Object],[object Object],Mobile Telephone Switching Office BASE STATION

Evolution of Mobile Phone Systems

Wireless Local Area Networks (WLANs) ,[object Object],[object Object],[object Object],[object Object],01011011 Internet Access Point 0101 1011

Wireless LANs Standards Many WLAN cards support 802.11a/b/g simultaneously (new) Standard Operating Frequency Throughput Max Raw Data Rate Range (indoor) Range (outdoor) 802.11b 2.4 GHz 4.3 Mbps 11 Mbps 38 m 140 m 802.11a 5 GHz 23 Mbps 54 Mbps 35 m 120 m 802.11g 2.4 GHz 19 Mbps 54 Mbps 38 m 140 m 802.11n 2.4 GHz, 5 GHz 74 Mbps 248 Mbps 70 m 250 m

Bluetooth ,[object Object],[object Object],[object Object],[object Object],[object Object]

IEEE 802.15.4 / ZigBee Radios ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ultrawideband (UWB) Radios ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data rate 10 kbps 100 kbps 1 Mbps 10 Mbps 100 Mbps 0 GHz 2 GHz 1GHz 3 GHz 5 GHz 4 GHz 6 GHz 802.11a UWB ZigBee Bluetooth ZigBee 802.11b 802.11g 3G UWB

Range 1 m 10 m 100 m 1 km 10 km 0 GHz 2 GHz 1GHz 3 GHz 5 GHz 4 GHz 6 GHz 802.11a UWB ZigBee Bluetooth ZigBee 802.11b,g 3G UWB

Power dissipation 1 mW 10 mW 100 mW 1 W 10 W 0 GHz 2 GHz 1GHz 3 GHz 5 GHz 4 GHz 6 GHz 802.11a UWB UWB ZigBee Bluetooth ZigBee 802.11bg 3G

Technical Challenges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recent Research Activities (since 1998) ,[object Object],[object Object],[object Object]

MIMO (multiple-input multiple-output) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What can MIMO offer :

Fundamental Gains: Multiplexing ,[object Object],[object Object],[object Object],[object Object],Tx Rx Tx Rx Spatial Channel 1 Spatial Channel 2

Fundamental Gains: Diversity ,[object Object],[object Object],[object Object],[object Object],Tx Rx Fading Channel 1 Fading Channel 2 Fading Channel 3 Fading Channel 4 Tx Rx

Research Issues ,[object Object]

Applications of MIMO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

C ooperative C ommunications (CC) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Research Issues for Cooperative Comm. ,[object Object],[object Object],[object Object],[object Object]

A Scenario: Wireless Multi-hop Cellular Networks ,[object Object],[object Object]

Cognitive Radio (CR) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Research Issues for Cognitive Radio ,[object Object],[object Object],[object Object]

Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Contact me ,[object Object],[object Object],[object Object]

Meixia Tao Introduction To Wireless Communications And Recent Advances

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Meixia Tao Introduction To Wireless Communications And Recent Advances