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Research on the Satellite Communication System Based on CDMA-CWTDM Conversion

Author: HuXiaoLin
Tutor: YiKeChu
School: Xi'an University of Electronic Science and Technology
Course: Communication and Information System
Keywords: CDMA-CWTDM Spread Spectrum System gain Synchronous Multi-user detection
CLC: TN927.2
Type: Master's thesis
Year: 2006
Downloads: 47
Quote: 0
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Abstract


This study is based on a new system of satellite communication satellite the CDMA-CWTDM ( Code Division Multiple Access - continuous wave division multiplexing) conversion . Compared with the ground center station based on the CDMA- TDM conversion of the satellite communication system , a large central station of this new system is not expensive and cumbersome , but the same can make the volume and cost of the station is drastically reduced, but also have to make the channel utilization double the rate of the station to the station's propagation delay is reduced by half and other attractive benefits . This paper studies based on the USAT ( ultra-small aperture terminal (VSAT) ) mobile the Star on CDMA-CWTDM conversion communication system design , demonstration , simulation , one of the key technologies including : despread the satellite technology , satellite the multiuser detection technologies , CWTDM complex the pick / jump Technical , CWTDM tap / technology , like point solution jump to tap the high-precision samples interleaved CWTDM signal synchronization technology, and resistance to multipath fading . The main research content and results : 1. Designed the CDMA-CWTDM satellite communication system , its ground-launched on-board processing , part of the key technologies of the basic principles of its ground receiving detailed analysis . 2 . Detailed analysis of the system gain satellite despreading , demonstrates the need for despreading in the CDMA-CWTDM satellite communications system , satellite , and simulation . 3 focuses on spreading key technologies the CDMA-CWTDM satellite communication system . The best receiver in spread spectrum system and its anti-jamming capability , the best reception conditions also focus on synchronization technology that may be used in the system , including FFT Fast capture technology, one need only coarse synchronization part Points despreading method and polyphase filter based on the high-precision synchronization scheme . Analysis comparing some classic multi-user detection algorithm based on adaptive multi-user detection scheme suitable the CDMA-CWTDM satellite communications system .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications
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