title: Joint source-channel rate allocation in parallel channels.
abstract: A fast rate-optimal rate allocation algorithm is proposed for parallel transmission of scalable images in multichannel systems. Scalable images are transmitted via fixed-length packets. The proposed algorithm selects a subchannel, as well as a channel code rate for each packet, based on the signal-to-noise ratios (SNRs) of the subchannels. The resulting scheme provides unequal error protection of source bits and significant gains are obtained over equal error protection schemes. An application of the proposed algorithm to JPEG2000 transmission shows the advantages of exploiting differences in SNRs between subchannels. Multiplexing of multiple sources is also considered, and additional gains are achieved by exploiting information diversity among the sources.
authors: Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA. lpu@email.arizona.edu
authors: Lingling
authors: L
authors: Pu
authors: Michael W
authors: MW
authors: Marcellin
authors: Ivan
authors: I
authors: Djordjevic
authors: Bane
authors: B
authors: Vasic
authors: Ali
authors: A
authors: Bilgin
mesh_terms: D000465:Algorithms; D003196:Computer Graphics; D044962:Data Compression / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted