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Method for increasing detection probability of frequency spectrum perception

A technology of detection probability and spectrum sensing, which is applied in the field of improving the detection probability of spectrum sensing, can solve the problems that energy detection cannot be effectively detected, and achieve the effect of overcoming the problem of noise wall, good robustness, good feasibility and practicability

Inactive Publication Date: 2010-09-29
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, in this technology, when the signal-to-noise ratio is lower than a certain value, the energy detection will not be able to detect effectively, that is, there is a noise wall problem.
[0004] After searching, it was found that J.Ma and Y.G.Li published a paper titled "Soft combination and detection for cooperative spectrum sensing in cognitive radio networks" in "in Proceedings of IEEE Global Telecommunication Conference, pp.3139-3143, Nov.2007." Soft Cooperation and Detection for Cooperative Spectrum Sensing in Known Radio Networks", which proposed cooperative spectrum sensing based on energy detection, but this technology also has the problem of noise walls. When the signal-to-noise ratio is lower than a certain value, energy detection will Cannot detect effectively

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  • Method for increasing detection probability of frequency spectrum perception
  • Method for increasing detection probability of frequency spectrum perception
  • Method for increasing detection probability of frequency spectrum perception

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Embodiment

[0027] In the first step, the cognitive users participating in cooperative spectrum sensing sample the received signal r(t) to obtain the sampling sequence {x(1), x(2),...,x(N)} of the detection signal, where: N is the length of the sampling sequence, r(t)=A cosωt+n(t), A is the amplitude of the received signal r(t), ω is the carrier angular frequency of the received BPSK signal, and n(t) is the mean value of zero , with a variance of additive noise.

[0028] In this embodiment, A=1, ω=2π×10 6 rad / s.

[0029] In the second step, the sampling sequence of the detection signal is passed through the square law device to obtain the estimated sequence {x 2 (1),x 2 (2),...,x 2 (N)}

[0030] In the third step, each component x in the estimated sequence of signal power in the frequency band will be detected 2 (t) Accumulate to obtain the signal energy T in the detection frequency band x ,in: t=1,2,...,N

[0031] The fourth step, when detecting the signal energy T in the fre...

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Abstract

The invention relates to a method for increasing detection probability of frequency spectrum perception in the technical field of wireless communication. The method comprises the following steps: sampling received signals, and accumulating by using a square-law device to obtain a signal energy Tx within the detection frequency band; when Tx is less than or equal to the threshold gamma 1, the user transmits information which indicates that the master user signal does not exist to a merging center; when Tx is greater than or equal to the threshold gamma 2, the user transmits information which indicates that the master user signal exists to the merging center; or else, carrying out random resonance, and processing the state variable output sequence of the random resonance system by using the previous method until the cognitive user participating in the cooperative frequency spectrum perception transmits the detection result information which indicates that the master user information exists or does not exist to the merging center; and the merging center carrying out merging to obtain the final detection result information of the master user signal. The invention effectively increases the detection probability, has the advantages of low computation complexity, good robustness and favorable feasibility and practicality, is not susceptible to environment, and overcomes the problem of noise walls.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to a method for improving detection probability of spectrum sensing. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the contradiction between the continuous increase of wireless communication traffic and the shortage of wireless spectrum resources has become increasingly prominent. Cognitive radio technology is a new technology that can perceive and adapt to the surrounding wireless communication environment in different time and space. Cognitive users can fully and effectively utilize spectrum resources through effective perception of spectrum holes. Spectrum holes refer to those frequency bands that have been allocated to authorized users, but authorized users do not work at a specific time and place. Through the perception and utilization of idle spectrum resources, cognitive rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 林英沛何晨蒋铃鸽何迪
Owner SHANGHAI JIAO TONG UNIV
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