Title

Awqpsk: An Optimum Modulation Technique For Spread Spectrum Communication Using A Saw Modulator

Abstract

Quadrature phase shift keying (QPSK) and minimum shift keying (MSK) are the two most used M-ary modulation techniques in Direct-Sequence (DS) Spread Spectrum Communication systems. This paper introduces a new modulation technique that can compete with QPSK and MSK in many applications. This new modulation technique, made up of a superposition of one QPSK signal and two amplitude weighted QPSK signals, is called Amplitude-Weighted 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 side lobes are 63 dB down from the main lobe. Intersymbol interference (ISI) was simulated on an HP 9845 computer and was shown to be smaller than the ISI in a QPSK or an MSK signal. Two different implementation schemes are presented.

Publication Date

1-1-1984

Publication Title

Proceedings - IEEE Ultrasonics Symposium

Volume

1984-November

Number of Pages

116-120

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/ULTSYM.1984.198274

Socpus ID

85065663945 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85065663945

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