Method for real-time sense of carrier signal in wireless network

Abstract

The invention relates to a method for the real-time sense of a carrier signal in a short-range wireless network. The method comprises the following steps: firstly, receiving a radio-frequency signal transmitted by a transmitting terminal in the short-range wireless network, and carrying out down-conversion to obtain a baseband sample receiving signal; beginning to read a receiving signal of one code element cycle length from a random sampling point in the receiving signal; multiplying every sampling point in the receiving signal by the adjacent sampling point of the last moment after conjugating operation is carried out on every sampling point in the receiving signal to obtain a group of correlation value sequences; carrying out statistical operation on the correlation value sequences, and taking the obtained statistic value as a decision value; summing up the squared values of the magnitudes of all the sampling points in the receiving signal after calculating to obtain an energy statistic value of the receiving signal; and calculating the ratio of the decision value to the total energy statistic value and comparing a proportional value with a threshold so as to judge the channel state. The method has the advantages of not needing synchronization of time and the carrier, reducing the calculation amount and the complexity, increasing the real-time property of the realization of the system and enhancing the robustness of the algorithm to the system environment.

Description

technical field [0001] The invention relates to a method for real-time monitoring of carrier signals in a short-range wireless network, which belongs to the technical field of wireless communication. Background technique [0002] A system using a multiple access communication protocol with collision avoidance generally adopts the mechanism of listening to the carrier signal to listen to the channel in real time, and judges whether the channel is occupied by detecting similar signals in the channel, so as to avoid conflicts with the data being transmitted in the wireless network. Conflicts occur to achieve the purpose of improving network efficiency. In the communication protocol based on carrier sense multiple access with collision avoidance, it is very important to detect the carrier signal in real time for network communication. [0003] The process of listening to the carrier signal in real time is the process of detecting the signal. Detection can be done using the mod...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for real-time monitoring of carrier signals in a short-range wireless network, and solve the complexity problem of the method for real-time monitoring of carrier signals under the premise of satisfying performance

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