Abstract
This thesis is devoted to the investigation and implementation of an 315.00 MHz two-way digital RF transceiving system, including design of the two-way communication firmware encoding/decoding algorithms associated, performance optimization of the RF transceiver module used. The format of the wireless data packet includes the following various fields: preamble, sync. header, payload data, frame check sequence, and stop symbol. Since the interference and the noise over the air are ubiquitous, the anti-interference signal transmission and reception are definitely essential for a reliable digital wireless communication link. The DSP (Digital Signal Processing) techniques by uC-based firmware are utilized to help enhance noise-robustness. In error detection, a CRC (Cyclic Redundancy Check) checksum can be verified by again calculating the CRC checksum of the data and comparing the result with the checksum provided with the data. In data security, the algorithms of AES-WC encryption/decryption are used so that the data can be kept confidential. Then, the ping-pong communication can be successfully accomplished by using the appropriate two-way wireless communication protocol. The microcontroller and RF transceiver module are finally integrated and put to 1-way and 2-way range test in open site . Above contents will be discussed in detail in following sections.
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