Trends in Broadband Cellular Communication
Wireless communication is rapidly becoming the most popular solution to
deliver voice and data services due to flexibility and mobility that can be
offered at moderate infrastructure costs. Unfortunately, current wireless
systems are unable to support some services offered by wireline systems (i.e.,
high quality video streaming) due to the limited data rates achievable over
wireless links. At the same time, there is a growing demand from the operators
for better coverage to reduce infrastructure costs and enhance the wireless
experience of the customers. Perhaps one of the most promising solutions to
overcome these issues is multiple-input multiple-output (MIMO) technology.
Furthermore, the cell coverage and average data rate could be also improved by
using relay stations. Through the use of sophisticated signal processing
techniques, MIMO and relay can provide increased data rate or/and larger
coverage area than the conventional single antenna cellular systems.
The current 3G network problem
The throughput of the current wireless network is severely limited by :
- Scarcity of spectrum
- Limited transmit power
- Fluctuations in wireless links due to fading
Solutions : MIMO communication links and relay networks for
high capacity high quality wireless links
(Standardization status, as of Sep. 2006)
Beyond the shadow of a doubt, MIMO and relay network techniques will play a
major role for the next generation wireless communication systems. We, at WSIL,
are interested in the theoretical analysis and practical algorithm design for
these next generation wireless systems. Our group members are involved in a wide
range of activities including the following.
•
Multi-user MIMO Systems : Runhua Chen, Seijoon Shim, Chan-Byoung Chae
•
Multi-hop
Networks : Tae Hyun Kim
•
MIMO Relay
Channel : Caleb Lo, Chan-Byoung Chae
•
Limited Feedback
System : Kaibin Huang
•
MIMO Antenna
Design : Ramya Bhagavatula
•
MIMO
Prototyping : Robert Daniel
