Short-range Wireless Access Technologies To Achieve

We use wireless or infrared instead of the tradition cable, achieve intelligentize of the personal information terminal and build the personal work or family information network. It is the fashionable technique now. Wireless access technique is used in family and office; achieve data traffic, voice traffic, official equipment, Internet access and so on.First, this article introduces two main wireless access techniques: Bluetooth and IEEE802.11, analyses their advantage and disadvantage. Then, we bring forward a cheap and high quality project and design the circuit.This system is composed with physical layer and data link layer. In physical layer we use RFW102 which work at 2.4G ISM band. It is made by RFWaves Company. It adopt directly spread spectrum and its modulation mode is ASK. The article analyses the 2.4G ISM band radio ware transmission theory and spread spectrum technique particularly. And then, author designed the circuit and debug.Data Link Layer solves the problem of the data transmission in line, achieves Line Rules, Flux Control and Error Control function. Author investigateO the principle of these functions and then designed the circuit with Data Link Layer surface chip~FRW-D100 which is made by RFWaves Company. The article investigated the work principle of the chip and designs the circuit and MCU program.RFW-D100 is in charge of CSMA (Carrier Sense Multiple Access), which is the key technique of the WLAN. The article introduces the principle of CSMA, investigates CSMA protocol in RFW-D100. Because CSMA protocol is come true by software, Author tried to write the program of CSMA.