Four dimensional modem employing complex spreading sequences

Author

Marx, F.E. ; Linde, L.P.

Author_Institution

Dept. of Electr. & Electron. Eng., Pretoria Univ., South Africa

Volume

1

fYear

1999

fDate

1999

Firstpage

221

Abstract

In this paper a description and analysis of a four dimensional direct sequence spread spectrum (DS-SS) modem structure (Linde and Marx, 1999) employing complex spreading sequences (CSS), is presented. A description of the the four dimensional DS-SS transmitter as well as the receiver is given. The synchronization loops, including the four dimensional decision-directed Costas carrier recovery loop (DD-CGRL) and four dimensional decision-directed complex delay-locked-loop (CDLL) (De Gaudenzi and Luise 1991) are analysed and presented. The whole system is simulated and the simulation results as well as the performance in AWGN, which is comparable with a conventional BPSK SS modem, are shown

Keywords

AWGN; delay lock loops; modems; pseudonoise codes; radio receivers; radio transmitters; spread spectrum communication; synchronisation; AWGN; CDLL; DD-CGRL; complex spreading sequences; direct sequence spread spectrum; four dimensional decision-directed Costas carrier recovery loop; four dimensional decision-directed complex delay-locked-loop; four dimensional modem; performance; receiver; synchronization loops; transmitter; Africa; Bandwidth; Binary phase shift keying; Bit error rate; Bit rate; Cascading style sheets; Modems; Signal analysis; Spread spectrum communication; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Africon, 1999 IEEE

Conference_Location

Cape Town

Print_ISBN

0-7803-5546-6

Type

conf

DOI

10.1109/AFRCON.1999.820800

Filename

820800