서지주요정보
무선통신용 직접대역확산 모뎀의 구현에 관한 연구 = Implementation of direct sequence spread spectrum modem for wireless communication
서명 / 저자 무선통신용 직접대역확산 모뎀의 구현에 관한 연구 = Implementation of direct sequence spread spectrum modem for wireless communication / 박종준.
저자명 박종준 ; Park, Jong-Jun
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8007047

소장위치/청구기호

학술문화관(문화관) 보존서고

MICE 96036

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

등록번호

9003050

소장위치/청구기호

서울 학위논문 서가

MICE 96036 c. 2

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A spread spectrum modem is designed in this thesis work. Direct sequence spread spectrum algorithm is implemented using field programmable gate arrays(FPGAs) and an embedded microprocessor, 80C186EC which controls the entire modem system. The modulation method used in this work is DQPSK for noncoherent demodulation at the receiver. For the fast code acquisition required in time division duplex mode, a pseudo noise matched filter is used. Processing gain of the modem is programmable up to 64. It is easy to modify the system to have a higher processing gain because the matched filter has cascadable structure. Frequency offset is detected symbol-by-symbol by a frequency discriminator. The frequency offset is compensated by a complex sine multiplier. For fast complex multiplication, we use fast SRAM for look up table. A synchronous or an asynchronous data terminal equipment(DTE) can be attached to this modem. All data is synchronously transferred through a channel in a high level data link control(HDLC) frame. The HDLC frame is placed in an assigned time slot for the TDD. Full duplexing is also achieved by using different pseudo noise(PN) sequences. As a result, the modem receiver implemented in this work can detect the data well at 38.4kbps or above with the matched filtering and frequency drift compensation algorithm in the laboratory test.

서지기타정보

서지기타정보
청구기호 {MICE 96036
형태사항 iii, 92 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jong-Jun Park
지도교수의 한글표기 : 이황수
지도교수의 영문표기 : Hwang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 정보및통신공학과,
서지주기 참고문헌 수록
주제 대역확산
직접대역확산
디지탈 통신
무선
모뎀
Direct sequence
Spread spectrum
Digital communication
Wireless
Modem
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