한국전자파학회지:전자파기술 (The Proceeding of the Korean Institute of Electromagnetic Engineering and Science)
- 제5권3호
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- Pages.22-35
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- 1994
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- 1738-9712(pISSN)
상관 부호화된 디지털 FM 시스템에서 결정 궤환을 이용한 TFM의 최대 근사 추정
Maximum Likelihood Sequence Estimation of TFM with Decision Feedback Equalization in the Correlative Coded Digital FM System
초록
본 논문에서는 대역폭 효율의 향상을 위해 상관 부호에 따른 FM시스템올 설계한다. 상판 부호화된 신호는 연속 위상과 정진폭 특성으로 전력 효율이 높다. 하지만 이 신호는 최소 유콜리언 거리(
To improve the bandwidth efficiency in the environment of digital mobile communications, a correlative coded FM system is designed. The signal of this system has continuous phase and high power efficiency due to the constant envelope. But this signal also has a little loss of the SNR and some degradation of the BER. In this paper, a modified MLSE method which uses correlative coded signal is adopted to improve the performance of the receiver. The MLSE method improved the BER performance in the used channel. Without the decision feedback, the receiver performance was improved by 2dB and with it, by 4dB Particularly, the MLSE method and the decision feedback showed better performance in bad channels than in a stable telephone channel.
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