Email this article Forming signals with continuous phase for broadcast discrete information
- Authors: Dvornikov S.S.1, Dvornikov S.V.1
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Affiliations:
- Budyonny Military Academy of the Signal Corps
- Issue: Vol 22, No 6 (2016)
- Pages: 435-440
- Section: Digital processing of signals and images
- Published: 15.06.2016
- URL: https://journals.eco-vector.com/1684-6400/article/view/703518
- ID: 703518
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Abstract
The limitation of frequency range requires the development of new types of modulated signals. To determine the effectiveness of new types of signals are invited to identify the noise immunity of the signals and their spectral efficiency as a criteria. Protection against interference is defined by the signal / noise ratio, for predetermined value of the bit error rate. Under spectral efficiency we mean the bandwidth required to reliably transmit the signal at a predetermined rate.
Currently, the most effective criterion for noise immunity is phase shift keying. Therefore, signals of PSK were taken as the basis for the study. The analysis showed that the synthesis signals of phase shift keying can be representing as a sequence of radio pulses. The RF pulse duration is determined by changed of the phase discontinuity information symbol. Consequently, the spectrums of phaseshift keyed signals are similar to the spectrum of a sequence of pulses. Provided that the sequence and signals have the same data rate.
The results allow concluding that the phase-shift keyed signals have a good the noise immunity, but they do not satisfy in terms of spectral efficiency. This fact explains the phase discontinuity when changing the information symbol.
In order to improve the spectral efficiency of the phase-shifted signals are invited to perform the following sequence of actions.
In the first phase is created a signal which is a modulating signal. The modulating signal is a signal whose phase signal is manipulated by the law of the information signal. Thus, the minimum length of the information signal is equal to one period of the frequency of the modulating oscillations. The result is a phase-shift keyed signal of low frequency.
The second stage of algorithm produces a resultant modulated signal. For this purpose, phase of high frequency signal formed by the law by which changes phase-shift keyed signal of low frequency.
The result is obtained the signal of phase-modulation, whose spectrum occupies a smaller bandwidth compared with the corresponding speed transmission PSK signal. At the same time, the resultant signal of phase-modulation allows you to transfer discrete information. This fact makes it interesting for digital information transmission systems via radio.
The experiment showed that a new class of signals is has 2—3 times better spectral efficiency level of conservation in the transmission band of 85—95 % of the energy. A new class is defined as signals with signals of phase-modulated continuous-discrete.
About the authors
S. S. Dvornikov
Budyonny Military Academy of the Signal Corps
Author for correspondence.
Email: dvornikov_s_s@mail.ru
Assistant
Russian Federation, Saint-PetersburgS. V. Dvornikov
Budyonny Military Academy of the Signal Corps
Email: practicdsv@yandex.ru
Professor
Russian Federation, Saint-PetersburgReferences
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