Wireless Communications with Channel Feedback

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Presentation transcript:

Wireless Communications with Channel Feedback Vincent Lau Professor, Department of Electronic and Computer Engineering

(Q1) Who Am I?

B.Eng (1st Hons) Dept of ECE, University of Hong Kong (89-92) Brief Biography B.Eng (1st Hons) Dept of ECE, University of Hong Kong (89-92) System Engineer, HK Telecom (92-95) Ph.D., Cambridge University (95-97) Research Scientist, Bell Labs, New Jersey Joined HKUST at 2004 Area of Interests Theoretical Research: Next Generation Wireless Communication Systems Cross Layer Radio Resource Optimization Applied Research and Technology Transfer: Long Term Evolution (LTE) and Beyond Next Generation WiFi Systems

(Q2) Why Wireless Communication is important?

Wireless Everywhere Today Yesterday- 15 years ago Voice Yesterday- 15 years ago Millions of wireless devices SMS Mobile TV Social Networking Wireless Internet WiFi Email You Tube Today Billions of wireless devices

Wireless Everywhere Tomorrow +15 years Trillions of Wireless devices Cyber Physical Systems Environment Health Care New Devices Internet of Things Energy People to People People to machines Machines to Machines Tomorrow +15 years Trillions of Wireless devices

Bit rate faster than a lot of existing fixed line ISP today! Cellular Systems Today: 3G WCDMA Systems 2Mbps peak bit rate Mobility < 200km/hr Future: 4G Wireless Systems (LTE-A) >100Mbps bit rate Mobility ~ 480km/hr Bit rate faster than a lot of existing fixed line ISP today!

(Q3) Why Wireless is Challenging?

(1) Propagation Challenge Fixed line communication Stable Time-Invariant channel Reliable communication (Physical BER ~ 10-10) Wireless Communication Multipath Propagation  huge dynamic range Mobility  Time Varying channel (Physical BER ~ 0.1%)

(2) Capacity Challenge Transmitter Receiver Transmitter Receiver 101001100111…….. Transmitter Receiver 101001100111…….. Transmitter Receiver 101001100111…….. Bit rate demand increases  link becomes too slow 3 times bit rate! (Q1) Can we double the capacity by installing one more base station? No! Interference becomes the bottleneck Need to time share or frequency share

(3) Interference Challenge

(Q4) Benefit of Channel Feedback?

Wireless Communications with Channel Feedback Link Level:- Opportunistic Transmission:- Capture the “Good Channel Condition” to send more and add more protection for “Poor Channel Condition”. (2) System Level:- Opportunistic Scheduling:- Selects user(s) with the best channel condition to transmit. (3) Network Level:- Interference Mitigation:- Cooperative MIMO and Coordinated MIMO all requires channel condition feedback.

Future Trends Cloud Radio Access Network Large Scale MIMO Network Green Wireless Infrastructure

Thank you very much