DocumentCode
1115789
Title
A Leech lattice modem
Author
Lang, Gordon R. ; Longstaff, Frederick M.
Author_Institution
INf. Technol. Res. Centre, Brampton, Ont., Canada
Volume
7
Issue
6
fYear
1989
fDate
8/1/1989 12:00:00 AM
Firstpage
968
Lastpage
973
Abstract
A 24-dimensional block code based on the Leech lattice is described for use in a 19200-b/s modem. Encoding (the process of converting binary data into message point coordinates) and detection (conversion of the received coordinates into the coordinates of the nearest code point of the lattice) are described. Decoding (the further conversion of these into binary data) is not described, since it consists of an easily achieved reversal of the encoding process. Block (1000-bit-length) error rates in the presence of white noise for baud rates of 2400 and 2743, the two baud rates at which the modem can operate, are presented. Encoding plus decoding was successfully programmed for an ADSP2100 signal processor requiring altogether slightly less than one half the processing capability
Keywords
encoding; modems; 19.2 kbit/s; 24-dimensional block code; ADSP2100 signal processor; Leech lattice; block error rates; detection; encoding; modem; white noise; Bandwidth; Block codes; Convolutional codes; Decoding; Gaussian noise; Lattices; Modems; Signal to noise ratio; Space technology; Telephony;
fLanguage
English
Journal_Title
Selected Areas in Communications, IEEE Journal on
Publisher
ieee
ISSN
0733-8716
Type
jour
DOI
10.1109/49.29618
Filename
29618
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