The Amplitude-Locked Loop System for Separating

• Main Authors: Fang-Yi Yang, 楊方毅
• Other Authors: Gwo-Jia Jong
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/77726231655423102442

碩士 === 國立高雄應用科技大學 === 電子與資訊工程研究所碩士班 === 92 === Abstract The separation model for two source frequency modulated (FM) communications of the cochannel signals is developed in this paper. It is presented how the amplitude-locked loop (ALL) system works to improve the phase-locked loop (PLL) system for separating cochannel signals. The high performance demodulator presented in this paper includes both amplitude-locked loop and phase-locked loop block systems. The ALL system can be separated the dominant and the subdominant signals from each other. On the other hand, the new approach FM demodulator adopted the FM spectrum doubly. It is proposed to apply a similar technique to frequency-shift keying (FSK) modulation methods. Thus, any wireless communication system has to be designed to extract the most communication capacity and throughoutput out of a given spectrum allocation. Consequently, the combined method can be applied to improve the performance of any constant envelope FM transmission system or any other similar form of digital encoding scheme system. The simulation result is the effect of satate observability on the different interference to carrier ratio (ICR).