Frequency Planning And Interference Analysis Of Wlan Network

With the rapid development of mobile internet, data services shows explosive growth. WLAN, which has the advantages of low cost, high speed and easy to deploy, has became a important way to relieve pressure on traditional cellular network of data services for every operation business. However, during the large-scale construction and use of WLAN network, a lot of WLAN equipments work on2.4GHz that is open to the public, which makes other equipments work on the same frequency like bluetooth can interfere the WLAN system. Besides, only three non-overlapping channels can be used on this band, so co-channel interference is easy to be produced.What’s more, inter-system interference will be caused when WLAN network is built with other systems. As a consequence, the quality of network turns worse. Aiming at these problems, this paper studis frequency allocation, frequency planning and interference of WLAN network.Based on research, theoretical analysis and calculation of mathematical models, this paper discusses the main planning and construction problems of WLAN, including frequency allocation, frequency planning, intra-system interference and inter-system interference. At first, this paper researches and analyzes the frequency point that can be used by WLAN, and makes clear the frequency allocation at Home and Abroad. Besides, it tracks the progress of the latest national frequency allocation to provide the basis for frequency planning. Secondly, this paper conducts frequency planning based on full investigation of frequency allocation. By introducing new and pure5GHz frequency for frequency planning to use, the co-channel interference between cells can be avoided. After that, it introduces the advanced channel bonding technology to expand the channel bandwidth and enhance the rate. Based on that, it focuses on the specific frequency planning of indoor and outdoor, providing theoretical guidance for the actual construction. Finally, in order to deeply study the electromagnetic interference problem when WLAN system is built with other communication systems, this paper gives a detailed quantitative analysis of two main inter-system interferences, which are spurious emission interference and blocking interference. And then,the results are obtained to avoid the interference between multiple systems and meet the requirements of interference isolation. At the same time it makes concrete and feasible solutions to avoid the interference for construction and post-optimization.Through analysis of the above,it provides guidance and advice on WLAN network construction and optimization.