| Summary: | 碩士 === 逢甲大學 === 電子工程學系 === 89 === The research mainly aims to improve the performance of TCM-1 Trunking Radio System which only can transmit the voice, we develop a wireless modem to transmit data by using the voice channel of TCM-1. Basically, there are two features in the TCM-1 wireless modem communication, one is group-call and the other is point to point.
We take advantage of the “ group-call ” to design a wireless modem which matches the protocol of MPT-1327. This kind of wireless modem can be combined with the carphone of TECOM to simulate the Handset dialing, and to perform the functions of polling, roaming and data transmission.
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