CLEAREAD

Cross Layer Interaction for Resource Efficient Media Delivery


Passing information on application specific considerations and constraints (e.g. error sensitivities of each media layer) to medium access and physical layers provides proper objective for system optimization and leads to efficient resource utilization and desired performance. This is important for resource constrained system (bandwidth constrained, power constrained networks). Our approach is to incorporate error sensitivity as weight on each media layer in resource allocation. Although the concept is common, the detailed implementation depends on the underlying medium access and physical layers.

While previous approaches emphasize solely on joint selection of source coding and channel coding parameters, we exploit unique characteristics in multicarrier modulation scheme in physical layer to provide unequal error protection more economically. Multicarrier modulation or OFDM divide wide spectrum band into many subchannels with different channel quality. Conventional approach is to perform power and data rate allocation to equalize all the subchannels with the same error performance. Since the power required for achieving a given error performance is proportional to the logarithm of error performance and inversely proportional to the channel quality, the power consumptions at subchannels with less perfect channel quality will be much larger. To address this challenge, we design a system that leverages the unevenly distribution of channel quality to exploit natural unequal error protection for multimedia data. The resulting system directs media streams with stringent error sensitivities to subchannels in good conditions and other streams to subchannels in less perfect conditions. This is coupled with power allocation and rate adaptation to distribute resource among subchannels for optimized media quality. Information on each stream provides an optimization function for subchannel assignment. This simple source-channel matching mechanism significantly reduces power consumption and media distortions due to channel imperfection, which is verified by theoretical analysis and quantitative measure of image and video quality.

Similar concept is applied to modulation constellation design and antenna loading for BLAST.

Publications:
Robust Image and Video Transmission over Spectrally Shaped Channel Using Multicarrier Modulation
Haitao Zheng, K.J. Ray Liu
IEEE Trans. On Multimedia, Vol. 1, No. 1, pp. 88-103, March 1999
[Abstract, PDF]

Power Minimization for Delivering Integrated Multimedia Services Over Digital Subscriber Line
Haitao Zheng, K.J. Ray Liu
IEEE Journal of Selected Areas in Communications, Special Issue on Error-Resilient Image and Video Transmission, Vol. 18, No. 6, pp. 841-849,June 2000.
[Abstract, PDF]

Optimization Approaches for Delivering Multimedia Services over Digital Subscriber Lines
Haitao Zheng, K.J. Ray Liu
IEEE Signal Processing Magazine, Vol. 17, No. 4, pp. 44-60, July 2000.
[Abstract, PDF]

The Subband Modulation: A Joint Power and Rate Allocation Framework for Subband Image and Video Transmission
Haitao Zheng, K.J. Ray Liu
IEEE Trans. on Circuits and Systems for Video Technology, Vol. 9, No. 5, pp.823-838, August 1999.
[Abstract, PDF]

Power Optimized Space-Time Coding for Image and Video Transmission over Wireless Channels
Haitao Zheng, K.J. Ray Liu
Proc. of IEEE Int'l Conf. on Image Processing (ICIP), Kobe, Japan, Oct. 1999.
[Abstract, PDF]

Optimizing Wireless Multimedia via Cross Layer Design
Haitao Zheng
IEEE International Conference on Multimedia and Expo(ICME), Baltimore, Maryland, July 6-10, 2003, (invited paper).
[Abstract, PDF]

Also See CUDP Project and Publications Below

Packetization Scheme for MPEG Video over Wireless
Haitao Zheng, Jill Boyce
IEEE Wireless and Communications and Networking Conference(WCNC), Chicago, IL. Sept. 2000, no.1, pp. 191-195 (invited paper).
[Abstract, PDF]

An Improved UDP Protocol for Video Transmission over Internet-to-Wireless Networks
Haitao Zheng, Jill Boyce
IEEE Trans. On Multimedia, Vol. 3, No. 3, pp. 356-365, Sept. 2001.
[Abstract, PDF]

On the Performance of H.263 Video over Multiple Antenna Systems
Haitao Zheng, Dragan Samardzija
IEEE International Conf. on Vehicle Technology (VTC), Atlantic City, NJ. Oct. 2001.
[Abstract, PDF]

Streaming Video over Wireless Networks
Haitao Zheng, Jill Boyce
Wireless Internet Handbook, Technologies, Standards, and Applications, B. Furht, M. Ilyas, ed., CRC press, pp. 105-126, 2003
[Abstract, PDF]

Slides: coming soon!
People:
  • Haitao Zheng
  • K.J. Ray Liu
  • Jill Boyce
Haitao Zheng, April 16,2005