Gaussian fsk modulation with more than two modulation states
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Abstract
A wireless data transmission system 1) uses modulation onto a multi-level symbol 11), so that a multi-level frequency shifted signal can be generated 14). By using a Gaussian filter 13), inter-symbol interference can be introduced. The demodulation process 2) makes use of templates corresponding to each of the possible symbol transitions, so that knowledge of previously decoded symbols can be used to decode the next one.
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Citations
29 Claims
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1-12. -12. (canceled)
- 13. A signal transmitter comprising means for frequency modulating a digital signal onto a radio carrier, comprising means for converting the signal into a series of symbols having more than two modulation states, and means for generating a frequency modulated output using a partial response filter in which the impulse response of the filter extends over adjacent symbols.
- 15. A process for modulating a digital signal onto a radio carrier, using a frequency modulation system characterised in that there are more than two modulation states, and in the use of partial response signalling in which the impulse response of the filter extends over adjacent symbols.
Specification