A Short-range Wireless Data Communication System Design And Implementation

In this dissertation three kinds of short distance wireless communication technique including Bluetooth, IEEE802.11 and UWB are firstly introduced. Then I put forward a solution project for short-distance wireless data communication and implement it.The current development and tendency of short distance wireless communication technologies are firstly summarized, then the theories on direct spread spectrum communication (DSSS) and Surface Acoustic Wave (SAW) which are related to this paper are introduced. Based on these, I put forward a project about short distance wireless communication system which includes baseband, IF and RF part. In this system, we adopt MAXIM Company's interface chip–max232and RFWaves Company's baseband chip RFW-D100 and RF chip RFW112M. RFW-D100 realizes the protocol data packet encapsulation and checkout function. The RF chip adopts direct spread spectrum and its modulation mode is ASK.Data Link Layer solves the problem of the data transmission in line, accomplishes line rules, flow control and error control function. These functions are analyzed firstly and then the circuit with Data Link Layer interface chip RFW-D100 is designed. RFW-D100 is controlled by Microcontrollers Unit (MCU), and I finish the MCU program. RFW-D100 is in charge of CSMA (Carrier Sense Multiple Access), which is the key technique of WLAN. The article introduces the principle of CSMA, investigates CSMA protocol in RFW-D100.The circuit design and the control flow procedure in MCU are accomplished based on the data link protocol. In the end the debugging process of the system and the test results are given.