Joint design of a channel-optimized quantizer and multicarrier modulation

Author

Ho, Keang-Po ; Kahn, Joseph M.

Author_Institution

Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong

Volume

46

Issue

10

fYear

1998

fDate

10/1/1998 12:00:00 AM

Firstpage

1254

Lastpage

1257

Abstract

We present an algorithm for design of a joint source-channel coder using a channel-optimized quantizer and multicarrier modulation. By changing the power of each subchannel in the multicarrier modulation system, different degrees of error protection can be provided for different bits according to their importance. The algorithm converges to a locally optimum system design. Compared to a Lloyd-Max scalar quantizer or a LBG vector quantizer using single-channel transmission, our optimized code can yield substantial performance improvements. The performance improvements are most pronounced at low channel signal-to-noise ratios

Keywords

channel coding; modulation; optimisation; source coding; vector quantisation; LBG vector quantizer; Lloyd-Max scalar quantizer; algorithm; channel-optimized quantizer; error protection; joint source-channel coder; locally optimum system design; multicarrier modulation; optimized code; performance; signal-to-noise ratios; single-channel transmission; subchannel; Algorithm design and analysis; Bit error rate; Channel coding; Design optimization; Modulation coding; Power system protection; Signal to noise ratio; Simulated annealing; Transmitters; Vector quantization;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.725300

Filename

725300