Method for IEEE 802.11 protocol identification independent of signal demodulation

Abstract

The invention proposes a method for identifying the IEEE 802.11 protocol without relying on signal demodulation. According to the distribution characteristics of IEEE802.11 signal energy in the time domain, the method uses the periodicity of the beacon message sent by the IEEE 802.11 standard, and only analyzes the signal in the time domain. After sampling the signal, it undergoes preprocessing Filter out noise and interference, and then use a fast folding algorithm to calculate all possible periods, and calculate the dynamic threshold based on the criterion that the fixed false alarm probability minimizes the probability of missing alarms, judge the possible beacon periods, and choose the correct one. The results are finally displayed on the user interface. The method can be conveniently realized on general software radio peripheral equipment and general computer, and can be used to quickly identify network communication protocols under the condition that signals cannot be demodulated.

Description

technical field [0001] The invention relates to a method for identifying IEEE 802.11 protocols without relying on signal demodulation. The method can judge the communication protocol type used by the high layer by using the characteristics of the physical layer of the signal without demodulating the received wireless signal. Background technique [0002] In recent years, civil wireless networks, which are fast, efficient, and flexible in networking, have developed very rapidly. Typical wireless network standards include IEEE 802.11, IEEE 802.15, IEEE 802.16, etc. Wireless networks based on the above standards have been widely used in people's daily life. [0003] The coexistence of multiple communication systems has led to difficulties in the interconnection and intercommunication of different networks and devices. This is because in traditional communication systems and communication devices, most of the functions associated with the physical layer (such as modulation, et...

AI Technical Summary

Problems solved by technology

However, in practical situations, it is not always feasible to decode packets

In addition, in order to achieve network interoperability of different communication systems, it is necessary to integrate multiple communication protocols into the same set of gateway equipment, which requires extremely high processing capabilities of the gateway equipment, increases the burden on the gateway equipment, and is difficult to implement , or use multiple gateway devices, but it increases the overhead, which is not conducive to flexible networking

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