DocumentCode :
287490
Title :
On-board processing for Ka-band applications
Author :
Yim, W.H. ; Coakley, F.P.
Author_Institution :
Surrey Univ., UK
fYear :
1993
fDate :
2-4 Nov 1993
Firstpage :
225
Lastpage :
229
Abstract :
The work reported arose from a study carried out for the European Space Agency to examine the impact of 20/30 GHz operation on the on-board processing requirements for a satellite system intended to serve private user networks of small fixed terminals interconnected with 2 Mb/s ISDN-like links. Fading in Ka band leads to the requirement of expensive HPAs in the user terminals. It is therefore an advantage to use FEC on the uplink. Continuous mode transmission simplifies on-board decoding (and interleaving), and allows higher coding gains. A simple access scheme is FDMA with variable data-rate channels, therefore a nonuniform demultiplexer is required on-board. There are two methods that belong to the same general class. The fast convolution method is inherently more efficient than the analysis-synthesis method since clock synchronism can be exploited and the output sampling rate can be decimated down to the symbol rate. The frequency resolution is inherently larger and the placement of carrier frequencies are more flexible. CDMA is attractive as its complexity is similar to TDMA, since demultiplexing in the code domain requires only additions
Keywords :
decoding; demultiplexing; frequency division multiple access; satellite relay systems; 2 Mbit/s; 20 GHz; 30 GHz; CDMA; European Space Agency; FDMA; FEC; ISDN-like links; Ka-band applications; TDMA; clock synchronism; code domain; coding gains; continuous mode transmission; demultiplexing; fast convolution method; frequency resolution; interleaving; nonuniform demultiplexer; on-board decoding; private user networks; satellite system; variable data-rate channels;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Satellite Communications - ECSC-3, 1993., 3rd European Conference on
Conference_Location :
Manchester
Print_ISBN :
0-85296-603-2
Type :
conf
Filename :
266107
Link To Document :
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