Abstract
Quadrature phase shift keying (QPSK) and minimum shift keying (iISK) are the two most used Ivl-dry rriodulation techniques in Direct-Sequence (DS) Spread Spectrum Communication systems. This paper introduces a new modulation t echnique that can compete with QPSK and MSK in many applications. This new modulation t echnique, made up of a superposition of one QPSK signal and two amplitude weighted QPSK signals, is cal led Amplitude-Weight ed Quadrature Phase Shift Keying (AWQPSK). It is found to have the same probability of error as QPSK and MSK techniques. It has a higher bandwidth efficiency in bits/sec/Hz than QPSK and MSK. It has 99.99 percent of its energy within the null bandwidth and its sidelobes are 63 dB down from the main lobe. Intersymbol interference (ISI) was simulated on an IIP 9845 computer a nd was shown to be smaller than the IS1 in a QPSK or an MSK signal. Two different implementation schemes are presented.
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