Journal of the Korean Institute of Telematics and Electronics C (전자공학회논문지C)
- Volume 34C Issue 8
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- Pages.1-7
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- 1997
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- 1226-5853(pISSN)
A VLSI implementation of base band MODEM for direct-sequence spread spectrum communication
직접 확산 통신을 위한 기저 대역 MODEM의 VLSI 구현
- Kim, Geon (Pantech Co., Ltd.) ;
- Cho, Joong-Hwee (Dept. of Electronics Eng., Univ. of Inchon)
- Published : 1997.08.01
Abstract
In tis paper, w eproposed a modeling for direct-sequence spread communication base band modem in RT-level VHDL and implemented in a one-chip VLSI and tested. The transmitter modulates with DQPSK modulation method and spreads a modulated signal with 32-bit PN code into 1.152MHz. The receiver de-spreads a signal using 32-tap matched filter and recovers with DQPSK demodulation method. The digital frequency synthesizer generates the sine signal and the cosine signal of 2.304MHz with ROM tables in the size of 7
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