| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 95 === Spread-spectrum communication system, including direct sequence (DS) and frequency hopped (FH) systems, was developed rapidly in recent year. There are many applications in both military and commercial fields. In FH system, the signal could be damaged by fading effect. Intention or non-intention jammer also could harm the signal. Therefore, we use diversity-combining scheme to reduce fading and jamming effect.
The multitone jamming (MTJ) and partial-band noise jamming (PBNJ) are two principal categories of the interference models. The fading channel could be separated into two categories. One is frequency-nonselective fading channel and the other is frequency-selective fading channel. Among them, frequency-selective fading channel model is approached the practical situation.
In literature review, we find there are six kinds of anti-jamming receivers as follow : linear-combining receiver, product-combining receiver, maximum-likelihood (ML) Receiver, self-normalizing receiver, clipped-combining receiver, and ratio-statistic-combining receiver. In this thesis, we will discuss fast frequency-hopped binary frequency-shifted-keying system (FFH/BFSK) with MTJ and frequency-selective fading channel by using ML receiver.
Furthermore, we use the approximation to simplify the analyses of the performances.
The research is focus on theory derive and frame design of receiver. The result will be helpful for theory research and practical application and make anti-jamming receiver widely application in wireless communication system in future.
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