| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 91 ===
The Wireless Local Loop (WLL) is defined as“using any wireless communication technology that can substitute partially or completely the wired links between the fixed terminals and PSTN”. Initially WLL has been developed to solve the problems of wired communication infrastructure and high cost in low population density area. Besides, the qualities of the digitalized sound, data and communication, and their management are better than the present traditional wired system.
The statistical characteristic of the channel has a huge effect on the wireless communication system compared to the wired communication. It is very different from the wireless channel. The signals are propagated in the natural environment and their arrivals at the receiver are accompanied by numerous multi-path interference. This decreases the success rate of the signal demodulation.
The aim of this thesis is to introduce a 3.4GHz wireless system based on PACS. Simultaneously, a reference to the RF IC guidelines is used in establishing the Symphony system. According to the results of simulation with the transceivers at four typical suburban sites, the performance of the transceiver under the line of sight is better than that having non-line of sight. Besides, the calculation done according to the range of the base station shows that the transceiver can achieve the requirements for voice transmission.
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