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