서지주요정보
π/4-Shifted-DQPSK 변조방식을 이용한 디지탈 무선모뎀 구현에 관한 연구 = A real time implementation of π/4-shifted-DQPSK modem algorithm for wireless digital communication
서명 / 저자 π/4-Shifted-DQPSK 변조방식을 이용한 디지탈 무선모뎀 구현에 관한 연구 = A real time implementation of π/4-shifted-DQPSK modem algorithm for wireless digital communication / 김영주.
저자명 김영주 ; Kim, Young-Ju
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006823

소장위치/청구기호

학술문화관(문화관) 보존서고

MICE 96014

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

등록번호

9002826

소장위치/청구기호

서울 학위논문 서가

MICE 96014 c. 2

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도서상태

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반납예정일

초록정보

In This thesis work, we implement a baseband π/4-DQPSK wireless modem algorithm in real time using a DSP chip. The modem algorithm is capable of transmitting a data sequence at the symbol rate of 4.8kHz. The total transmission rate of the modem is 9.6kbit/s. In the transmitter, the roll-off factor of the square root raised cosine shaping filter is set to 0.35. The modulated output signal is upsampled by eight times the sample rate. This signal is fed to a radio frequency(RF) module of 236.715MHz. At the receiver side, the baseband signal at the RF module output is sampled at four times the symbol rate. After matched filtering the receiver input sampled signal, the DSP processes the signal to recover the transmitted information data sequence. The baseband modem receiver includes the functional blocks for timing recovery, synchronization, frequency drift compensation, and decoding. We implement the timing recovery block to have fast convergence suitable for burst mode transmission. The synchronization block uses synchronization words for compensating phase offset. The frequency drift is compensated in a decision-directed fashion. The wireless modem algorithm is simulated and then implemented using an Analog Devices' ADSP-21020 floating point DSP chip.

서지기타정보

서지기타정보
청구기호 {MICE 96014
형태사항 ii, 68 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Ju Kim
지도교수의 한글표기 : 이황수
지도교수의 영문표기 : Hwang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 정보및통신공학과,
서지주기 참고문헌 : p. 66-68
주제 디지탈 통신
무선
모뎀
변조방식
DQPSK
Digital communication
Wireless
Modem
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