Protocol In Short-Distance Wireless Spread-Spectrum Communication System And FPGA Realization

The short-distance wireless communication technology, whose application has a tremendous market, is dedicated to provide solutions for data transmission within 100 meters. In the implementation of the technology, the network protocol is the key, which greatly impacts the performance of the whole system.It gives a detailed discussion on current point-to-multiple-point protocols of the short-distance wireless spread-spectrum system and presents our improvement on the protocol. Based on the standard wireless communication protocol--IEEE802.11, targeting for the main function of the point-to-multiple-point network, the protocol is simplified to improve the performance and efficiency. On one hand, in physical layer, the RF(radio frequency) transmission rule of Direct-Sequence-Spread-Spectrum(DSSS) is defined in order to increase the spread-spectrum gain and improve the performace of anti-disturbing; On the other hand, in MAC layer, a group of communication rules based on RTS/CTS/ACK CSMA/CA mechanism is used.In this paper, the point-to-multiple-point protocol is described by the hardware description language-Verilog, synthesized by EDA tool Synplify pro, simulated by ModelSim, placed and routed by ISE, and downloaded to Field Program Gate Array, all of which make the whole design process rapidly accomplished and have a good result. After function amd timing simulation, it proves that the protocol can correctly deal with the communication among the stations and the internal base-band processing module. Besides, the on-the-spot experimental results show that our proposed point to multiple point protocol can accomplish the wireless data transmissions among the multiple points within 100 meters. The accuracy of transmission over 98% can be achieved.