臺灣博碩士論文加值系統

本研究的目的包括data rate為64Kbps的無線數據機（Wireless Modem）實體製作，並運用此系統架構在不同環境、不同距離下對傳輸資料正確性及接收功率進行量測，同時藉此數據分析驗證通訊理論和對無線通道特性能有更深入的瞭解。
無線數據機是以直接序列展頻的原理，15組chip length為32的PN Code，基頻控制電路部分是採51單晶片的架構，包含一顆AIC9001的SST IC；射頻模組，為ARF9003 Module。實驗量測環境，除了位於山上華梵大學校區內實驗室、狹長走廊、川堂、後山球場外，為了有所比較也在市區內的師範大學中操場、狹長走廊做了實驗量測。此外，在五股實習公司的工廠中同樣進行量測。這些一連串的量測，包含錯誤位元統計及接收功率比較。錯誤位元的量測，可以知道距離的遠近對資料傳輸正確性的影響；從接收功率與距離的關係並加以統計分析，更有助於我們對通道統計特性的瞭解。

In this thesis I design a wireless modem with 64Kbps data rate. Using this modem, I measured the bit error rate (BER), frame error rate (FER) and the receiving power strength in different environments. Based on the measured data, I have a chance to check some communication theories as well as understand the characteristics of wireless channels.
This wireless modem employs the direct sequence spread spectrum (DSSS) technique. The PN code I use is the extended balanced Gold code with length 32.
The modem contains two parts. One is the baseband subsystem, which is composed of a spread spectrum transceiver (SST) IC (AIC9001) and a microprocessor (89C51). The other is the ARF9003 RF module. Our measurement environments include laboratories, hallway, corner, mountain-top basketball-court, office, factory and an apartment. I hope that the data I obtained in the experiments can help people understand the statistic characteristics of wireless channels.