Study Of Diversity Technology Based On Phase-inversion Symmetric

Classical communication theory is based on single user system andAdditive White Gaussian Noise (AWGN). Shannon’s formula is also derivedon the base of these. However, nowadays, there is a great quantity ofNon-AWGN exists in the wireless channel except AWGN. The test resultsshow that the noise of adjacent channels has certain relativity and its entropypower is less or far less than its actual power, which makes the channel haspotential information transmission rate.Phase-Inversion Symmetric Method (PISM) is an effective method toimprove the utilization rate of channel by taking advantage of the noise’scorrelation in adjacent channels. The research results of PISM are applied insome communication systems. Funded by NSFC, we studied on the theory ofthe noise’s correlation and the principle of PISM, achieved some theory andapplication results. In the project group，research of the "diversity technologybased on phase-inversion symmetric " is my task.By using PISM, two signals of phase-inversed are transmited into twoadjacent channels. In the terminal, the recievor make these two signals tosubtract. It is considered that noises are not relative by traditional theory. Butwhen the two noises are relativity, the noise in adjacent channels will be restrained. So it became to the key issue of the research that whether the noiseshave relativity. With the actual test and the theoretical analysis, we find thatcorrelation coefficient of noise is usually greater than0, especially man-madenoise correlation coefficient is more than0.9, no matter in adjacent timeinterval or adjacent channel or adjacent space.Based on the research of the correlation of noise, this thesis firstly doessome theoretical analysis and system simulation on time-domain PISM, andthen, uses PISM in spread spectrum communication technology. By usingsimulation software, it is validated that the simulation results are conformed tothe theoretical value of noise relativity in adjacent time slot. On this basis,combined PISM with spread spectrum communication technology infrequency domain, space domain and time domain, I propose some newmethods of spread spectrum communication, which goes through thesimulation and experimental verification. Finally I make the systemic modelsof those methods. Theory and practice both show that, capability ofphase-inversion symmetric spread spectrum technology is superior to thetraditional spread spectrum technology in the same transmission conditions.My job aims to explore the application range and the practical value ofPISM, conducts a study on the diversity technology based on PISM (PIS-DT),and improves the utilization rate of channel by using the correlation of noise inadjacent channels. Further, we will explore the potential channel informationtransmission rate and derive the calculation method of channel capacity under the condition of the Non-AWGN and put the research result in the existingwireless communication system and the4G core technology as soon aspossible.With my teachers and classmates’ help, my research on this project getsome achieved some theory and application results and I invented the“Diversity receiving method based on Phase-Inversion Symmetric Method”(which achieved one China’s patent).