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ARTICLES

Overcoming Hard Limiter Suppression

For about half a century the suppression effects of bandpass hard limiters on various combinations of signals and interference have attracted widespread interest. 1-4 Certain "rules of thumb" have accreted around a variety of theoretical results. The purpose of this article is to revisit issues of interpretation and to...
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Regrowth of Data Spectral Sidelobes from AM/PM Effects and Hard Limiting

Framework for analyzing and predicting the power spectral sidelobe regrowth from soft saturating amplification of data signals having small percentage carrier ripple
Technical Feature Regrowth of Data Spectral Sidelobes from AM/PM Effects and Hard Limiting Frank Amoroso Santa Ana, CA A previous article 1 set forth a framework for analyzing and predicting the power spectral sidelobe regrowth from soft saturating amplification of data signals having small percentage carrier ripple. The results...
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Nyquist Quadrature Frequency Shift Keying for Spectral Efficiency

In-depth discussion of NQFSK, a constant carrier output modulation format with excellent spectral containment
TECHNICAL FEATURE Nyquist Quadrature Frequency Shift Keying for Spectral Efficiency Frank Amoroso Santa Ana, CA T he selection of a data modulation scheme for radio transmission usually involves a trade among a number of parameters, including communications efficiency (bit error rate (BER) vs. signal-to-noise ratio), bandwidth efficiency and factors...
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FRACTIONAL OUT-OF-BAND POWER FORMULAS FOR BPSK, QPSK AND MSK

Closed-form expressions for out-of-band power for classical binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK) and minimum-shift keying (MSK) modulation
TECHNICAL NOTE FRACTIONAL OUT-OF-BAND POWER FORMULAS FOR BPSK, QPSK AND MSK FRANK AMOROSO Consultant Santa Ana, CA   Fractional out-of-band power (FOBP) has for some time been a standard metric of spectral containment for digital data signals.1 For any given modulation scheme the FOBP can be measured experimentally or...
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