Optimum PCM Codes for DPSK

Author

Sundberg, Carl-Erik

Author_Institution

Univ. of Lund, Lund, Sweden

Volume

26

Issue

1

fYear

1978

fDate

1/1/1978 12:00:00 AM

Firstpage

169

Lastpage

174

Abstract

The effect of digital errors in PCM systems for speech signals depends on the PCM code used. The standard binary folded PCM code is superior to the natural binary code but it is not optimum. This paper considers PCM codes especially designed to be insensitive to the double error patterns produced by DPSK. It is concluded that the dynamic range with especially designed PCM codes is considerably extended compared to standard binary folded PCM. Special simplified interleaving schemes and optimum PCM codes for coherent PSK are also considered. The dynamic behavior of various PCM codes is calculated and compared, e.g., asymptotically optimum PCM codes for DPSK, binary folded PCM with and without interleaving, asymptotically optimum PCM codes for coherent PSK, etc. We conclude that the best scheme for DPSK is simplified interleaving and an optimum PCM code for PSK. This paper also gives analytical formulas for double error $A$ -factors for standard PCM systems.

Keywords

DPSK communication; PCM coding/decoding; Speech coding; Binary codes; Code standards; Density functional theory; Differential quadrature phase shift keying; Interleaved codes; Phase change materials; Phase shift keying; Quantization; Speech analysis; Speech coding;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOM.1978.1093953

Filename

1093953