An efficient channel code assignment scheme for multiple users in cdma systems

W. Y. Kung, Chang-Su Kim, C. H. Hwang, C. C. Jay Kuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Effective transmission of video CDMA is in this work. A channel code assignment scheme that efficiently protects compressed bitstreams while minimizing multiple access interference (MAI) is proposed. First, each video signal is coded with a two-layer structure that consists of the base and the enhanced bitstreams according to the bit importance. Then, these bitstreams are protected against transmission errors with channel codes such as RCPC. Better protection of higher bit-rate video requires more multicodes in spreading, which can lead to a severe multiple access interference problem. We set up a framework to a joint design of channel codes and spreading codes with the feedback of the channel status, and provide a solution to deal with the trade-off between channel coding rates and the assigned number of multicodes to achieve efficient transmission. Preliminary experimental results are presented to demonstrate the performance of the proposed channel code assignment scheme.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsA.G. Tescher, B. Vasudev, V.M. Bove
Number of pages11
Publication statusPublished - 2001
Externally publishedYes
EventMultimedia Systems and Applications III - Boston, MA, United States
Duration: 2000 Nov 62000 Nov 8


OtherMultimedia Systems and Applications III
CountryUnited States
CityBoston, MA



  • CDMA
  • Channel code assignment
  • Multiple access interference
  • Wireless video transmission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Kung, W. Y., Kim, C-S., Hwang, C. H., & Jay Kuo, C. C. (2001). An efficient channel code assignment scheme for multiple users in cdma systems. In A. G. Tescher, B. Vasudev, & V. M. Bove (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4209, pp. 140-150)