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Conference Paper
Design and implementation of mobile satellite modulator based on MF-CDMA
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- Authors
- Joon Gyu Ryu, Min Su Shin, Hoon Jeong, Young Wan Kim, Deock-Gil Oh
- Issue Date
- 2004-09
- Citation
- Vehicular Technology Conference (VTC) 2004 (Fall), pp.2054-2057
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- 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/spl plusmn/4.35 MHz. And then the analog block converts this low IF signal to 950/spl sim/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/spl sim/1450 MHz. And the modulator shows good IMD3, -61 dBc.
- KSP Keywords
- Analog part, Conversion method, Low-IF, Maximum transmission, Mobile satellite, RF switch, Transmission Rate, design and implementation, digital attenuator, frequency band, quadrature modulation