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Optimization of CVQ codebook index for noisy channels  

한종기 (세종대학교 정보통신공학과 멀티미디어 신호처리연구실)
김진욱 (세종대학교 정보통신공학과 멀티미디어 신호처리연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.3C, 2003 , pp. 315-326 More about this Journal
Abstract
Abstract In this paper, an improved index assignment procedure is proposed to reduce the channel error effect in a communication system employing classified vector quantization(CVQ). The proposed algorithm consists of two parts: inner index assignment (IIA) and cross index assignment (CIA). The II A reduces the distortion resulting from the error in order bits, presenting the identity of each code vector in a subcodebook. The CIA modifies the indexes assigned by the IIA in such a way that the effect of the channel error occurring in class bits, indicating the class information of the code vector, can be minimized. Simulation results show that the proposed algorithms enable a reliable communication over noisy channels even without employing the channel encoding. Index Terms Classified vector quantization, index assignment.
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