서지주요정보
순환 등화 기법을 사용한 Trellis 부호화된 V.26ter 모뎀 알고리즘 구현에 관한 연구 = Implementation of the trellis -coded V.26ter modem algorithm with cyclic equalization
서명 / 저자 순환 등화 기법을 사용한 Trellis 부호화된 V.26ter 모뎀 알고리즘 구현에 관한 연구 = Implementation of the trellis -coded V.26ter modem algorithm with cyclic equalization / 김광철.
저자명 김광철 ; Kim, Kwang-Chul
발행사항 [대전 : 한국과학기술원, 1998].
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등록번호

8008799

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 98009

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초록정보

In this thesis work, we implement the 2400bps all-digital modem using a digital signal processor (DSP) chip. The modem algorithm is designed based on the ITU-T V.26ter specification and modified to transmit telephone channel voice signal. The usual algorithms of the V.26ter modem consist of symbol timing recovery, adaptive equalization, carrier recovery, and echo cancellation, etc. Trellis-coded modulation (TCM) and cyclic equalization are added to the V.26ter modem. The Viterbi algorithm, a soft-decision maximum-likelihood sequence decoding algorithm, is used as a method of decoding TCM. The 8-PSK with the 8-state TCM acheives a coding gain of 3-4dB, compared with the uncoded QPSK. This coding gain is obtained without bandwidth expansion or reduction of the data rate. Cyclic equalization for very fast start-up of the adaptive equalizer is adopted. The sequence having constant amplitude and zero autocorrelation (CAZAC), whose period in symbols is equal to the number of the equalizer taps, is used for training. Cyclic equalization using the CAZAC sequence converges more rapidly for about 200-300 symbols than the LMS algorithm. The modem algorithm is optimized for real-time implementation. For the implementation of the modem, we use a TMS320C50 DSP chip.

서지기타정보

서지기타정보
청구기호 {MEE 98009
형태사항 iii, 58 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kwang-Chul Kim
지도교수의 한글표기 : 이황수
지도교수의 영문표기 : Hwang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학과,
서지주기 참고문헌 : p. 56-58
주제 트렐리스 부호 변조
순환 등화
타이밍 복구
반향파 제거기
비터비 디코딩
TCM
Cyclic equalization
Carrier recovery
Echo canceller
Viterbi decoding
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