Title :
A DS/FH Burst Communication Modem based on SAW Elastic Convolvers
Author :
Kowatsch, M. ; Lafferl, J.T. ; Seifert, F.J.
Author_Institution :
Abteilung fÿr Angewandte Elektronik, Institut fÿr Allgemeine Elektrotechnik und Elektronik, Technische Universitÿt Wien, Gusshausstrasse 27-29, A-1040 Vienna, Austria
fDate :
Oct. 31 1983-Nov. 2 1983
Abstract :
This paper presents a burst-type spread spectrum communication modem with binary orthogonal code shift keying (CSK) employed for data modulation. A burst consists of an 8-bit synchronization preamble followed by a block of 1000 message bits, transmitted at 84 kbit/s. The spread spectrum modulation scheme is direct sequence (DS) combined with noncoherent frequency hopping (FH). Each bit of both the preamble and the message portion of a burst is encoded by a different 255-chip Kasami sequence with a chip rate of 21.4 MHz. The hop rate of the carrier is equal to the data rate, the number of frequencies being 13. The total transmission bandwidth is 300 MHz. Receiver signal processing is based on the application of two SAW elastic convolvers to programmable matched filtering. Performance measurements in a simulated communications channel show good agreement with theory.
Keywords :
Bandwidth; Convolvers; Filtering; Frequency synchronization; Matched filters; Modems; Modulation coding; Signal processing; Spread spectrum communication; Surface acoustic waves;
Conference_Titel :
Military Communications Conference, 1983. MILCOM 1983. IEEE
Conference_Location :
Washington, DC, USA
DOI :
10.1109/MILCOM.1983.4794800
