Design and implementation of mobile satellite modulator based on MF-CDMA

Author

Ryu, JoonGyu ; Shin, Minsu ; Jeong, Hoon ; Kim, Youngwan ; Oh, Deock-Gil

Author_Institution

ETRI, South Korea

Volume

3

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

2054

Abstract

In this paper a mobile satellite modulator based on MF-CDMA is designed and fabricated. The mobile satellite modulator can support maximally 384 kbit/s. To support maximum transmission rate of 384 kbit/s we need 3 frequency bands. The baseband I/Q quadrature modulation and Mux is implemented in the digital block. The output of the digital part is a low IF signal, 20±4.35 MHz. And then the analog block converts this low IF signal to 950∼1450 MHz by the double conversion method. The mobile satellite modulator includes a 5-bit digital attenuator, RF switch and BPF. We implemented both digital part and analog part in one PCI card. We measured the mobile satellite modulator´s spurious rejection at about >55dBc and the output signal flatness is <5dB at 950∼1450 MHz. And the modulator shows good IMD3, -61 dBc.

Keywords

attenuators; code division multiple access; mobile satellite communication; modulators; quadrature amplitude modulation; switches; transceivers; 15.65 to 24.35 MHz; 384 kbit/s; 5 bit; 5-bit digital attenuator; 950 to 1450 MHz; BPF; IMD3; MF-CDMA; PCI card; RF switch; baseband I/Q quadrature modulation; mobile satellite modulator; Artificial satellites; Digital modulation; Internet; Mobile antennas; Radio broadcasting; Radio frequency; Satellite broadcasting; Satellite communication; Switches; TV broadcasting;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1400401

Filename

1400401