Phase modulation technique for pulsed frequency sh
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专利名称：Phase modulation technique for pulsed frequency shift keying circuits
发明人：OREN YOKEV,HANOCH YOKEV
申请号：AU3833500
申请日：20000330
公开号：AU3833500A
公开日：
20001016
专利内容由知识产权出版社提供
摘要：A Pulsed Frequency Shift Keying (PFSK) modulation method and apparatus are described which uses narrow bipolar pulses (902) to shift the frequency of a carrier signal (904) generated by a phase locked loop (700) which results in a phase shift keying of the carrier signal (904). The first, positive-going narrow pulse (906) shifts the frequency of the carrier signal (904) from a first frequency to a second frequency, and returns the carrier to the first frequency thereby changing the phase of the carrier (904). Then, a second, negative-going narrow pulse (908) shifts the frequency of the carrier signal (904) from the first frequency to a third frequency, thus restoring the original phase of the carrier. A pair of positive-going and negative-going differential pulses (902) represents one symbol of transmitted information. The implementation of this pulsed frequency shift keying modulation may be in biphase shift keying, or in any number of multiple phase shift keying implementations where a single symbol represents more than one digital bit.
申请人：NEXUS TELOCATION SYSTEMS, LTD.,OREN YOKEV
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