ISR research accomplishments
A Multimedia Transmission Framework for Broadband Networks
Research team
K.J. Ray Liu (ECE/ISR)
Accomplishment
Current modems for broadband networks did not take into consideration special properties of multimedia data, and are not effective for delivering multimedia services and applications. But soon broadband networks will be accessed by millions of users.
We developed a robust multimedia transmission framework by taking into consideration inherent properties of multimedia data as well as broadband channels’ characteristics to jointly optimize the performance using multicarrier modulation and space-time coding.
System architecture |
Comparison to serial transmission |
Power optimized space-time code:
- Source layers are transmitted consecutively using space-time code to exploit space-time diversity
- Allocate the transmitted power during each layer transmission
- Simple optimization function
Impact
The work opens a new door in developing new multimedia modems for broadband networks (ADSL or wireless channels) to provide reliable, and efficient access to Internet for multimedia services. It can accommodate more users than the exisitng schemes for millions to enjoy high-quality multimedia services over broadband networks.
For more information
Contact Dr. Liu at kjrliu@isr.umd.edu
