Optimal rate allocation in progressive joint source-channel coding for image transmission over CDMA networks

This paper presents an optimal rate allocation scheme in joint source-channel coding (JSCC) for image transmission over CDMA networks. Our scheme first uses progressive joint source-channel codes [V. Stankovic et al., Sep. 2002] to generate operational transmission rate-distortion (TR-D) functions o...

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Vydáno v:2003 International Conference on Multimedia and Expo Ročník 1; s. I - 661
Hlavní autoři: Jianping Hua, Zixiang Xiong
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 2003
Témata:
Bit error rate
Data communication
Error correction
Image coding
Image communication
Intelligent networks
Lagrangian functions
Multiaccess communication
Rate-distortion
Wireless communication
ISBN:9780780379657, 0780379659
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Shrnutí:This paper presents an optimal rate allocation scheme in joint source-channel coding (JSCC) for image transmission over CDMA networks. Our scheme first uses progressive joint source-channel codes [V. Stankovic et al., Sep. 2002] to generate operational transmission rate-distortion (TR-D) functions of different multiple-access channels with different BERs. The Lagrange multiplier is then employed to set the optimal rate allocation among different channels, subject to a total transmission rate constraint. Progressive JSCC offers the scalability feature that is very attractive for handling bandwidth variations in wireless communications. By extending the rate-distortion function in source coding to the TR-D function in JSCC, our work borrows the "equal slope" argument [Y. Shoham and A. Gersho, Sep. 1988] to effectively solve the rate allocation problem in JSCC for multi-channel image transmission. Experiments show that our scheme runs in real time and provides competitive performance at all intermediate transmission rates.
ISBN:9780780379657
0780379659
DOI:10.1109/ICME.2003.1221004