Development of an FEC combined modem for DS-SSMA communication system

Author

Inoue, S. ; Ishizu, T. ; Watanabe, E. ; Kataoka, N. ; Miyake, M. ; Inoue, A. ; Ito, H. ; Fujino, T.

Author_Institution

Mitsubishi Electr. Corp., Amagasaki, Japan

fYear

1990

fDate

2-5 Dec 1990

Firstpage

746

Abstract

The development of a forward error correcting (FEC) modem for low-bit-rate satellite communication systems using direct-sequence spread-spectrum multiple-access (DS-SSMA) communication techniques is described. Utilizing a digital correlator and a convolutional encoder/Viterbi decoder, the modem achieves rapid acquisition time and low bit error rate performance under very low carrier-to-noise (C/N) ratios. Experimental results indicate a mean acquisition time of 220 ms and bit error rate of less than 1×10^-7 at the received intermediate frequency C/N ratio of -31 dB. The digital matched filter, digital correlator LSI, delay lock loop, and binary phase-shift keying modulator used in the modem are described

Keywords

error correction codes; error statistics; modems; multi-access systems; satellite relay systems; spread spectrum communication; BER; DS-SSMA communication system; FEC combined modem; acquisition time; binary phase-shift keying modulator; delay lock loop; digital correlator LSI; digital matched filter; direct-sequence spread-spectrum multiple-access; forward error correction; low-bit-rate satellite communication systems; Bit error rate; Correlators; Decoding; Error correction; Forward error correction; Frequency; Modems; Satellite communication; Spread spectrum communication; Viterbi algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE

Conference_Location

San Diego, CA

Print_ISBN

0-87942-632-2

Type

conf

DOI

10.1109/GLOCOM.1990.116606

Filename

116606