868.35 MHz 數位無線收發機之天線與雙向韌體設計

本論文研究868.35 MHz數位射頻收發機之天線和雙向通訊韌體) 的設計，含無線數據封包編碼、解碼設計、射頻收發模組性能最佳化調整、平面天線設計，以提升整體數位無線通訊系統效能。其中無線數據封基本上包含下列各式欄位：訓練前導碼、同步頭碼、資料欄位、訊框檢查序列、與停止位元。在無線通訊通道中自然雜訊與人為雜訊干擾是無所不在，為使數位無線通訊系統之可靠度強健化，通訊距離亦能有效增長，無線數據封包韌體編解碼演算法必須崁入即時抗雜訊干擾之數位訊號處理的能力。本論文使用循環冗餘檢查序列做為錯誤偵測機制，漢明碼 / 錯誤徵狀 / 錯誤式樣做為錯誤更正機制。為有效降低叢式雜訊干擾，另運用交錯與解交錯技巧做為叢式錯誤錯誤分散之機制。再者，制訂適當之雙向數位無線通訊協定，以便雙向乒乓通訊距離測試之進行。上述無線數據封包編解碼與抗雜訊數位訊號處理均使用微控器與組合語言來實現，故最後整合微控器，射頻收發模組，與天線，並於開放空間進行本論文所構建之數位無線通訊系統的單向與雙向距離測試。

關鍵字

射頻收發機；天線；雙向通訊；韌體；無線數據封包；編碼；解碼；訓練前導碼；同步頭碼；資料欄位；訊框檢查序列；停止位元；通訊通道；雜訊；可靠度；演算法；即時；數位訊號處理；錯誤偵測碼；循環冗餘檢查；錯誤更正碼；漢明碼；錯誤徵狀；錯誤式樣；叢式錯誤；叢式錯誤；錯誤分散；交錯；解交錯；雙向數位無線通訊協定；乒乓通訊距離測試；微控器；組合語言；開放空間；單向距離測試；雙向距離測試

並列摘要

This thesis is devoted to the investigation and realization of an 868.35 MHz two-way digital RF transceiving system, including design of the 2-way communication firmware encoding/decoding algorithms associated, performance optimization of the RF transceiver module used, and design of a planar antenna of reduced length. The format of the wireless data packet basically includes the following various fields: training preamble, sync header, payload data, frame check sequence, and stop symbol. In any open wireless communication channel, nature-generated and human-made noises are ubiquitous. In order to enhance the performance reliability and system range of the digital wireless communication system under study, the 2-way encoding/decoding communication firmware has to be embedded with effective real-time noise-robust digital signal processing algorithms. In this thesis, The Cyclic Redundancy Check sequence is adopted as the error-detecting mechanism, Hamming coding and the error syndromes/error patterns associated are used to provide the necessary error-correcting capability. In view of the intermittent burst noise created by other radio users, interleaving/de-interleaving techniques are utilized to effectively spread out the burst errors possible.Moreover, a 2-way digital wireless communication protocol is designed so as to demonstrate the 2-way communication capability and facilitate the subsequent 2-way ping-pong range test. Since all the foregoing encoding, decoding, and anti-noise tasks for the wireless data packets to be communicated are realized with the aid of a microcontroller and the assembly language, the microcontroller, RF transceiver module, and antenna are finally integrated and put to 1-way and 2-way range tests in open site or space.

並列關鍵字

RF transceiver ； antenna ； duplexing ； firmware ； wireless data packet ； encoding ； decoding ； training preamble ； sync header ； payload ； frame check sequence ； stop symbol ； communication channel ； noise ； reliability ； Algorithm ； real-time ； digital signal processing ； error detection coding ； cyclic sequence check ； error correction coding ； Hamming coding ； error syndrome ； error pattern ； burst noise ； burst error ； error spreading ； interleaving ； de-interleaving ； two-way digital wireless communication protocol ； ping-pong range test ； microcontroller ； assembly language ； open site ； open space ； 1-way range test ； 2-way range test

參考文獻

[8]洪正瑞編著，詳細解析PIC16F877原理與應用，台科大圖書股份有限公司，台北，2004。

[3]D. M. Pozar, Microwave Engineering , 3rd Ed., John Wiley & Sons, 2004 .

[14]Microchip Inc., “TB045 KEELOQ® Manchester Encoding Receive Routines,” http://www.microchip.com/, 2001.

[17]Microchip Inc., “AN1148 Cyclic Redundancy Check(CRC),” http://www.m-

icrochip.com/, 2008.

國際替代計量

868.35 MHz 數位無線收發機之天線與雙向韌體設計

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