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Research on the Multi-access Technology in the Emergency System

Author: YanJianFeng
Tutor: QianLiang
School: Shanghai Jiaotong University
Course: Electronics and Communication Engineering
Keywords: TETRA VSAT WIFI WIMAX GSM / CDMA 1X PHS WCDMA TD-SCDMA
CLC: TN915.6
Type: Master's thesis
Year: 2008
Downloads: 175
Quote: 1
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Abstract


Emergency communication system is an important part in the city 's emergency command communication system . In response to important events , emergencies , events , emergency communications systems often play a very important role . This paper discussed a variety of wireless access methods to adapt to the emergency communications system , such as WIFI , WIMAX , satellite , GSM / CDMA / WCDMA etc.; summarized based on the work of the emergency communications vehicles , such communications environment work characteristics , focusing on analysis of the different emphases of emergency communications in fixed and mobile environments . The same time, based on the specifications of the receiver and transmitter isolation method is proposed to calculate , pointed out the various engineering equipment can be implemented based on the actual performance parameters detailed calculations to obtain better isolation requirements engineering results . Paper also application environment based in several mainstream communication systems , such as GSM , WCDMA, TDSCDMA , WIMAX , etc. co-located , quantitative discussion of the problems of co-located , WCDMA and WIMAX, WCDMA PHS system simulation study , WCDMA and TD -SCDMA system co-located coexistence interference effects . And pointed out how the insertion loss through the introduction of the controlled system , to improve the overall system gain . In addition to this simple expounded and discussed papers on the implementation process of the current UMTS and WLAN heterogeneous network convergence and seamless handover technology .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > Access network
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