Title :
On concentric spherical codes and permutation codes with multiple initial codewords
Author :
Nguyen, Ha Q. ; Goyal, Vivek K. ; Varshney, Lav R.
Author_Institution :
Res. Lab. of Electron., Massachusetts Inst. of Technol., Cambridge, MA, USA
fDate :
June 28 2009-July 3 2009
Abstract :
Permutation codes are a class of structured vector quantizers with a computationally-simple encoding procedure. In this paper, we provide an extension that preserves the computational simplicity but yields improved operational rate-distortion performance. The new class of vector quantizers has a codebook comprising several permutation codes as subcodes. Methods for designing good code parameters are given. One method depends on optimizing the rate allocation in a shape-gain vector quantizer with gain-dependent wrapped spherical shape codebook.
Keywords :
vector quantisation; computationally-simple encoding procedure; concentric spherical codes; gain-dependent wrapped spherical shape codebook; multiple initial codewords; operational rate-distortion performance; permutation codes; structured vector quantizers; Convergence; Design methodology; Encoding; Entropy coding; Laboratories; Optimization methods; Quantization; Rate-distortion; Shape; Source coding;
Conference_Titel :
Information Theory, 2009. ISIT 2009. IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-4312-3
Electronic_ISBN :
978-1-4244-4313-0
DOI :
10.1109/ISIT.2009.5205511
