mobile communication

GSM has been widely used in the area of commercial mobile communication. For such a long time developing, the technologies which involved in GSM nearly achieved perfect. As well as used in commercial mobile area, it has also been used in other specific areas, such as railway. These are my chi flat iron!There is a big space of progress in those specific areas in our country. This thesis is based on the need of special requirement.The oversea began to research those areas very early. For the importance of those technologies, China also goes on its research of GSM in specific areas, however a little behind than developed countries.You had cheap ralph lauren polo shirts at″I like it!″The thesis is aiming at developing a GSM receiver for special needs. Software-Defined Radio conception is applied in my research. The use of FPGA and DSP making us need no more ASIC chips. My ralph lauren polo shirts are here! After extensive study of GSM system, 1 have compared two kinds of GMSK modulations, put forward so called "denotation synchronization" and the other derotation method. Finally, put attention to equalization of GSM receiver.The main contributions of the article are following:1. Derotation synchronization research. For very little Chinese articles mentioned derotation in details, I have done it carefully. The signal required derotation is serial, so synchronization is necessarily.2. Put forward the other derotation method. The original derotation contents complex operation, as we know, it's hard to apply on hardware. 1 put forward a new method that divide complex serial into two parts, one is real, the other is complex, then derotate each parts.3. Equalization's coefficient research. Correlation will change the amplitude of signal, but the best result come with the same amplitude of signal and equalization's coefficient. How to decide the amplitude is explained in the paper.4. Research GMSK modulation methods. On timing and frequency.5. Compare the performances of equalization in different environments.
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