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Wireless LAN based on WiFi technology is a typical application of modern wireless communication technology in the computer network, mobility, easy installation, low cost, scalability advantages. Its core technology IEEE802.11b communication protocols, bandwidth up to 11Mbps. 802.11b protocol is based on the DSSS radio frequency modulation technique, strong anti-stem, the only physical transmission technology was selected as the standard, 802.11b and 1Mbps and 2Mbps 802.11DSSS system interoperable. The IEEE802.11b runs in the 2.4GHz band, do not need to apply can be used. Either as a supplement to the wired network, independent of the network, so that network users get rid of the shackles of cable, the true sense of the mobile application. Have a the IEEE802.11b protocol function chip technology, however, has been abroad a few companies control the related technology, the project aims to develop a chip technology with independent intellectual property rights. Design powerful and resource-rich FPGA chip select, IEEE802.11b protocol design, FPGA-based functional modules. To this end, the first analysis of the basic connotation of IEEE802.11b communication protocols, anatomical function of each part of the network communication, including the network structure, the characteristics of the various types of frames, the MAC layer protocol and frame format. On this basis, according to the design method of the top-down (Top-dowm) the TCB module the the BFB Module, TFB module, the data packet generator and a data output of the design of the top module, and thus the MAC module, and 802.11 module top-level module design. As a hardware description language Verilog HDL design selected using the Xilinx ISE development platform, through the use of the hand-written Verilog program combined with some call IP Core, the final completion of the the 802.11b protocol module design. With integrated simulation tools, simulation and debugging of the module function. Considered the meantime, from the system level performance constraints between each module, so select a reasonable configuration, optimized system structure to performance balancing between modules and the system performance optimization. The test results prove the correctness of the design ideas and implementation methods, simulation effect initially reached the intended target. The reference and the reference value of the results achieved by the design methods and Institute, the further development of the IEEE802.11b communications protocol chip.
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