Maximum S/N Synthesis Technology in CDMA Repeater ViPu Information http://www.cqvip.com Academic Forum Maximum S/N Synthesis Technology in CDMA Repeater Anhui Institute of Optics and Precision Mechanics, Chinese Academy of Sciences Du Jiyan Hu Jun Zhang Baishun Abstract Based on the introduction of the concept of diversity reception in mobile communication systems and the classification of diversity technologies, this paper focuses on polarization diversity reception technology, expounds the implementation scheme of the polarization synthesis diversity large S/N synthesizer for mobile communication, gives a relatively detailed discussion on the production of actual circuits, and finally introduces the application of diversity repeaters in mobile communication networks. Keywords 1 Introduction Diversity technology is a major anti-fading technology, which can greatly improve the transmission reliability under multipath fading channels. Among them, space diversity technology has been successfully applied to analog shortwave communications in the early days. In mobile communications, especially in the third generation of digital mobile communications, diversity technology has been more widely used. For example, in the uplink of mobile communications, base stations widely use dual space diversity reception; in the soft switching of the cell of IS-95, Rake is used for dual space reception. 2.2 Classification of diversity According to the purpose of diversity, it can be divided into: (1) Macro diversity, which aims to resist slow fading. Due to the diversity of ground contours, there are various changes in local areas. If only one antenna site is used, due to the changing terrain, ...
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