Share Email Print
cover

Proceedings Paper

Efficient channel code assignment scheme for multiple users in CDMA systems
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Effective transmission of multiple video signals over a CDMA system simultaneously is investigated 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.

Paper Details

Date Published: 22 March 2001
PDF: 11 pages
Proc. SPIE 4209, Multimedia Systems and Applications III, (22 March 2001); doi: 10.1117/12.420814
Show Author Affiliations
Wei-Ying Kung, Univ. of Southern California (United States)
Chang-Su Kim, Univ. of Southern California (South Korea)
Chien-Hwa Hwang, Univ. of Southern California (United States)
C.-C. Jay Kuo, Univ. of Southern California (United States)


Published in SPIE Proceedings Vol. 4209:
Multimedia Systems and Applications III
Andrew G. Tescher; Bhaskaran Vasudev; V. Michael Bove, Editor(s)

© SPIE. Terms of Use
Back to Top