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Spectrum Economy for Filtered and Limited FSK Signals

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1 Author(s)
Boykin, J. ; Systems Development Div., Westinghouse Electric Corp. Defense and Space Ctr., Baltimore, MD, USA

Where a frequency-shift keying (FSK)keyer generating a spectrum that is broad compared to that required for the information is used, considerable spectrum economy can often be obtained by passing the signal through a properly selected symmetrical bandpass filter. The signal can then be passed through a hard limiter which regenerates some of the sidebands filtered off, but not nearly all of them. This limiter renders the signal suitable for amplification by classC, switching type, or other high-efficiency amplifiers. For low indices of modulation, an approximation can be made of the effect of a filter by assuming that the modulation signal is filtered by the low pass analogy of the bandpass filter, and that each component of the modulating wave modulates the carrier independently.

Published in:

Communication Technology, IEEE Transactions on  (Volume:19 ,  Issue: 1 )