Naumenko V. Noise resistan bispectrum-organized modulation methods in modern digital communication systems

The object of research - a process of treatment bispectral-organized signals-triplet with the a priori set frequency-phase connections between spectral components. The purpose of researches is development noise-immune in relation to additive and to impulsive noises, and also to influence of fading in the channel of radio communication and phase fluctuations (jitter) of method of the bispectral-organized modulation based on the synthesis bispectral-organized signals-triplet and method of distinction of these signals by a new test statistics of the third order - peak estimations of bispectral density of signals-triplets. The methods of mathematical and computer simulation; methods of probability theory and mathematical statistics methods; spectrum analysis methods; methods of optimal reception are used in thesis. Practical value of the received results consists in the following: 1. The algorithm of practical implementation of the bispektral-organized modulation, efficient in severe constraints of influence of noises is offered. 2. Usage of a method of the bispektral-organized modulation allows, in a case with the frequency communications, to receive a scoring in comparison with FSK and FSK-4 - 8dB at BER = 10e-3, for a case with phase-frequency communications the scoring makes 9,5 dB in the presence of additive Gaussian noise. 3. Circuits of generation of the bispektral-organized signals about usage of one and two generators DDS are developed. Scientific novelty of the received results consists in the following: 1. The method of the bispectral-organized modulation and demodulation, based on use of signals-triplet test statistics of detection signals-triplets on a background noises as a value of peak's estimation bispectrum (biamplitud). 2. The method of distinction of signals on a background noises by the use of cross-correlation function of the third order and bispectrum of signal-triplet is improved. 3. The method of communication of data with the use of bispectral-organized triplet got further advance. Implementation level - branch. Application field: For increase of efficiency of distinction of signals against variable signal-noise conditions, with a priori uanknown statistical and spectral characteristics. Results of operation also can be useful in the modern systems of a digital mobile radio service from the point of view of improving of interference immunity of the given systems.