Performance of trellis codes for primary rate ISDN

Author

Khalifa, Ahmed R. ; Ahamed, Syed V.

Author_Institution

Al-Azhar Univ., Cairo, Egypt

fYear

1994

fDate

1-5 May 1994

Firstpage

816

Abstract

Trellis code combines channel coding and modulation techniques for data transmission over band limited channels. Theoretically, it achieves significant coding gains over conventional uncoded multilevel modulation without compromising bandwidth efficiency. The authors study the effect of trellis encoding algorithms, and evaluate their effectiveness for the carrier serving area (CSA) loop environment in the presence of imperfect echo cancelers, for primary rate ISDN application. A basic methodology for the simulation of trellis codes for QAM clusters is utilized. The effect of trellis codes for 16and 64-QAM is studied. Results for the coded 16- and 64-QAM constellations for three typical loops with 60 dB of echo cancellations are presented. The effect of trellis codes on the entire PCSA (pseudo CSA) loop population is also presented

Keywords

ISDN; channel coding; echo suppression; quadrature amplitude modulation; subscriber loops; trellis codes; 16-QAM; 64-QAM; QAM clusters; band limited channels; carrier serving area loop environment; channel coding; data transmission; echo cancellation; imperfect echo cancelers; modulation techniques; primary rate ISDN; trellis codes; trellis encoding algorithms; Bandwidth; Code standards; Convolutional codes; Decision feedback equalizers; Echo cancellers; ISDN; Maximum likelihood decoding; Modulation coding; Quadrature amplitude modulation; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on

Conference_Location

New Orleans, LA

Print_ISBN

0-7803-1825-0

Type

conf

DOI

10.1109/ICC.1994.368808

Filename

368808