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<p>Linear modulation schemes such as phase shift keying (PSK) and quadrature  amplitude modulation (QAM) are inherently spectrally efficient. This research seeks  enhanced spectral efficiency by designing new spectrally efficient pulse shapes for such  digital modulations. The pulses designed are of finite duration and exhibit zero  intersymbol interference when received through an additive white Gaussian noise  (AWGN) channel. It is shown that the resulting communications signals have optimal  spectral roll-off while maintaining optimum bit error ratio performance when received  via an AWGN channel. The bandwidths and power spectral densities of communications  signals using these pulses are compared with traditional spectrally efficient  communications signals.
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<br>Subjects: Electrical engineering; Amplitude modulation; Random noise theory; Digital communications</div>
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Nga, Chee Wei.</div>
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