DocumentCode
1378594
Title
Efficiency of asynchronous CDMA systems
Author
Giubilei, R.
Author_Institution
Selenia Spazio SpA, Rome, Italy
Volume
27
Issue
4
fYear
1991
Firstpage
343
Lastpage
345
Abstract
The efficiency of direct sequence (DS), BPSK modulated, code division multiple access (CDMA) systems is addressed, applying general concepts of the information theory. Under the hypothesis of a totally asynchronous system, which uses random signature sequences, it is shown that an ultimate efficiency of 2.16 bit/chip can be achieved. Moreover the performance is presented of systems that use convolutional codes, with constraint length 7 and rate up to 1/8.
Keywords
code division multiple access; mobile communication systems; phase shift keying; BPSK modulated; asynchronous CDMA systems; code division multiple access; constraint length; convolutional codes; direct sequence; efficiency; information theory; random signature sequences; totally asynchronous system;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19910217
Filename
86748
Link To Document