A quasi coherent spread spectrum decoder for satellite communications using a low rate convolutional code

Author

Tomlinson, M. ; Abu Rgheff, M.A.

Author_Institution

Satellite Centre, Univ. of Plymouth, UK

Volume

2

fYear

1996

fDate

22-25 Sep 1996

Firstpage

570

Abstract

A new form of bandpass convolutional decoder is presented. The decoder has as its basis, the classic Viterbi algorithm, but uses envelope (energy) detection in order to cope with a frequency offset, phase rotating received signal. The advantage of this decoder is that it does not need to be proceeded by a modem and is not subject to the problems of cycle slips. It can operate at negative input SNR values and is well suited to the decoding of low rate convolutional codes as may be used in CDMA systems. An example is given of a 1/6 rate system operating at 16 kbits/sec using a EUTELSAT satellite

Keywords

Viterbi decoding; code division multiple access; convolutional codes; quadrature phase shift keying; satellite communication; spread spectrum communication; 16 kbit/s; CDMA systems; EUTELSAT satellite; QPSK modulation; Viterbi algorithm; bandpass convolutional decoder; envelope detection; frequency offset signal; low rate convolutional code; negative input SNR values; phase rotating received signal; quasi coherent spread spectrum decoder; satellite communications; Convolution; Convolutional codes; Decoding; Envelope detectors; Modems; Phase detection; Phase frequency detector; Satellites; Spread spectrum communication; Viterbi algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on

Conference_Location

Mainz

Print_ISBN

0-7803-3567-8

Type

conf

DOI

10.1109/ISSSTA.1996.563191

Filename

563191