Development Of Radio Station With IEEE802.11b

Now the basic point of WLAN voice transmission is using the existing WLAN construction to lead voice into WLAN. A voice transmission scheme in WLAN system is provided in the paper. The performance of the 2.4GHz channel model is analyzed. Combined with the characteristics of the system, this scheme adopts chips supporting 802.11b standards to realize high-speed wireless transmission. The distribution of RF circuit and PA in the card is researched. Then the microwave trip in the RF circuit is simulated. The scheme uses ARM9 to support wireless access and service process, designs a system mechanism for transferring and controlling. Based on these a self-designed TDMA protocol is loaded, accordingly a voice transmission mode of TDD with the speed of 64Kbps is realized. Finally the feasibility of the system is validated. The system realizes a high speed transmission for voice and provides a testing platform matching the actual environment for researchers who study on MAC and network protocol.