서지주요정보
π/4-DQPSK 변조방식을 이용한 무선 통신용 디지탈 모뎀의 구현에 관한 연구 = Real time implementation of the π/4-DQPSK modem algorithm for wireless digital communication
서명 / 저자 π/4-DQPSK 변조방식을 이용한 무선 통신용 디지탈 모뎀의 구현에 관한 연구 = Real time implementation of the π/4-DQPSK modem algorithm for wireless digital communication / 노영섭.
저자명 노영섭 ; Roh, Young-Sup
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007044

소장위치/청구기호

학술문화관(문화관) 보존서고

MICE 96033

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

등록번호

9003047

소장위치/청구기호

서울 학위논문 서가

MICE 96033 c. 2

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

In this thesis work, a baseband π/4-DQPSK wireless modem is implemented in real time using a T.I. TMS320C50 fixed point DSP chip and the performance of the system is obtained. The modem is capable of transmitting digital data 38.4kbps or above. 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 over-sampled by four times the symbol rate. This signal is fed to a radio frequency(RF) module of 219MHz. At the receiver side, the baseband signal at the RF module output is sampled at four times the symbol rate. After matched filtering the sampled receiver input signal, the DSP processes the signal to recover the transmitted information data sequence. The baseband modem receiver implemented in this thesis includes the functional blocks of timing recovery, synchronization, frequency drift compensation, and decoding. We implement the timing recovery block to have fast convergence suitable for burst mode transmission. The frequency drift is compensated in a decision-directed fashion. As a result, the implemented modem converges well within 15 symbol period with the timing recovery and frequency drift compensation algorithm for TDD mode in laboratory test.

서지기타정보

서지기타정보
청구기호 {MICE 96033
형태사항 ii, 60 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Sup Roh
지도교수의 한글표기 : 이황수
지도교수의 영문표기 : Hwang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 정보및통신공학과,
서지주기 참고문헌 : p. 58-60
주제 디지탈 통신
무선
모뎀
변조방식
DQPSK
Digital communication
Wireless
Modem
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