Interference detection method of direct spread communication signal based on eye diagram energy
A technology for interference detection and communication signals, which is applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problem that interference signals are difficult to detect, and achieve limited noise adaptability, convenient implementation, and improved accuracy and stability Effect
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Embodiment 1
[0030] With the development of communication technology and jamming technology, there are more and more jamming, and the communication environment is becoming more and more complex. Therefore, anti-jamming technology is becoming more and more important. At the same time, people's requirements for communication quality are getting higher and higher. In order to ensure high-quality communication performance, it is very urgent to realize the detection of interference signals under low interference-to-signal ratio. At present, the energy detection method is often used in engineering to detect interference. However, due to the limited adaptability of this method to noise, the overall interference detection probability is not very accurate, and it is impossible to achieve interference detection under low interference-to-signal ratio.
[0031] The method provided by the invention combines the eye pattern and energy of the received signal, so that the overall interference detection pro...
Embodiment 2
[0051] The direct spread communication signal interference detection method based on eye diagram energy is the same as embodiment 1, the eye diagram of the received signal in step (2), see figure 2 , follow the steps below to set:
[0052] (2a) The received signal after sampling in the step (1) is divided into the signal segment x of M=a Δt with the length of L section i , i=1,2,3,...,L; Among them, Δt is the sampling time interval, a is a positive integer, and the selection of a should ensure that at least one complete eye is obtained in the eye diagram of the received signal. In this example, a =32.
[0053] (2b) will receive each signal segment x of the signal i The time-domain waveforms of are gradually accumulated, i=1,2,3,...,L, and the eye diagram of the received signal can be obtained, the horizontal axis represents the time, and the vertical axis represents the amplitude of the received signal.
[0054] When the energy detection method is used for interference det...
Embodiment 3
[0056] The direct spread communication signal interference detection method based on eye diagram energy is the same as embodiment 1-2, and the eye diagram matrix A of the received signal in step (3) is set according to the following steps:
[0057] (3a) Divide the time axis of the eye diagram evenly into a parts with an interval of Δt, and a=64 in this example.
[0058] (3b) The amplitude axis of the eye diagram is evenly divided into b parts, which are called quantization levels; the selection of b is determined by the degree of quantization, the larger b is, the greater the degree of quantization is, and the smaller the quantization error is.
[0059] (3c) Establish a zero matrix A of size a×b.
[0060] (3d) Through (3a) and (3b), the coordinate range of the eye diagram is evenly divided into a×b areas, which are in one-to-one correspondence with the rows and columns of the matrix A, and each area is called the eye diagram coordinate area.
[0061] (3e) Record each point in...
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