Research Of Orthogonal Transform Based On The Integer Residue Class Ring In CDMA

Along with the development of mobile communication, the demand of large capacity, high speed and integrated service are constantly proposed and CDMA is paid close attention to. How to deal with a number of information becomes the most urgent problem at present. In this thesis, we encircle the several key problems about walsh transform in the integer residue class ring to IS-95 channels.This thesis has been studied the walsh transform in integer residue class ring. First of all, with the research of the IS-95 channels, walsh transform in the integer residue class ring is concretely applied to the CDMA mobile communication system for the first time. It has the function of data compression so as to improve the validity of the information transmission. At the same time, the operation in the integer residue class ring has the advantages of high-speed calculation and having no rounding error. As the result, it has practical value. Moreover, multiple QAM is improved to solve the problems about the information's transmission.About orthogonal transform, fast arithmetic method is used to improve transform efficiency. During the information demodulation, according to the knowledge on the software radio and dyadic additive group, a program is made to produce useful codes for correlative demodulation. Furthermore, the modulation and demodulation is validated through a program of VC++. The result is analyzed in detail and we get a good result.