Research On Related Theory And Technology Of Non-orthogonal Multi-Modulation

Non-orthogonal multi-modulation technology(NMT for short) is a new modulation technology which is invented by Professor Liang Dequn.The theoretical research has proven that NMT can break through the Nyquist rate.A large number of simulations and practical experiments show that bandwidth efficiency is 1.2～3 times of OFDM in the corresponding channel.As far as the OFDM is concerned,the sensitivity of the phase and frequency offset,the ratio of the peak to mean value and the energy requirement are lower.In the course of the research,some new theoretical and technical issues have been founded and this paper aims to solve them.Related theories,technical issues and the researching results are as follows:1.Ill-posed problems of the demodulation equationsIn the demodulation course,the cause of ill-posed problems of the equations is analyzed and further researched.It is mainly comprised of the influence on the demodulation matrix caused by the shape and number of the sub-wave and the additional wave.2.The structure of the demodulation matrixThe structure of demodulation matrix and the influence of its structural variation on the norm inverse are analyzed.Then,the demodulation matrices of the amplitude modulation and phase modulation are described.3.The solution of the multiple linear equationsA geometric method of the multi-linear equations is given and concrete examples are describedto illustrate the superiority of this method.4.The problems of removing trailing waveAn automated method is proposed to remove the trailing wave.