M-sequence frequency hopping code structure restoration method based on dynamic reconstruction
A technology of dynamic reconstruction and frequency hopping code, applied in electrical components, transmission systems, etc., can solve problems such as difficulty in determining, lack of practicability and adaptability, etc.
Active Publication Date: 2020-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, when the number of stages of the linear shift register of the frequency hopping signal source and the bandwidth of the adjacent frequency hopping frequency interval are unknown, it is difficult to determine how many frequency points need to be received to meet the above two conditions
This makes the practicability and adaptability of the B-M algorithm in practical engineering applications lacking, and needs to be improved
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[0075] Next, a specific example is adopted to carry out experimental verification of the present invention. The shift register in the L-G tap model is set to be an 8-bit shift register in the present embodiment, and its primitive polynomial f(x)=[0 1 1 1 0 0 0 1], and its polynomial expression is f(x)= x 8 +x 4 +x 3 +x 2 +1, with 2400GHz as the reference frequency, the tap position is [1 3 7], the tap address code is [01 1], the frequency hopping signal is adjacent to the frequency hopping center point interval bandwidth B=2MHz, and the total frequency hopping bandwidth is 14MHz , the frequency hopping code sequence generated by it is [7 2 2 2 3 0 1 5 6 5 3 7 0 2 6…], and the frequency hopping frequency point corresponding to the natural mapping of the frequency hopping code sequence is [2414 2404 2404 2404 2406 2400 2402 2410 2412 2410 2406 2414 2400 2404 2412 2406...]. When the first 6 frequency points [2414 2404 2404 2404 2406 2400] are continuously received, the recei...
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The invention discloses an m-sequence frequency hopping code structure restoration method based on dynamic reconstruction. The method comprises the steps of: receiving frequency hopping frequency in real time; adding appropriate decision conditions, taking nf continuous frequency hopping frequencies to form a frequency hopping frequency set; calculating to obtain a frequency hopping code maximum value N; when the log2(N+1) is a non-negative integer, performing frequency hopping code sequence inverse mapping; then, solving a primitive polynomial by adopting a B-M algorithm; if the number of received frequency hopping frequencies is greater than or equal to twice of the stage number of the primitive polynomial, restoring to obtain the tap position and the tap address code of the L-G tap model, if the number of the taps and the tap interval meet the requirement, restoring to obtain the L-G tap model structure parameter based on the m sequence according to the primitive polynomial, the tapposition and the tap address code which are obtained through current calculation. According to the method, the frequency hopping sequence family structure model can be quickly and accurately reconstructed and restored under the condition that the number of the linear shift registers of the target frequency hopping signal source, the interval bandwidth of adjacent frequency hopping frequencies andwhether the frequency hopping frequency points contain all the used frequency points or not.
Description
technical field [0001] The invention belongs to the technical field of frequency hopping communication, and more specifically relates to a method for restoring the structure of an m-sequence frequency hopping code based on dynamic reconstruction. Background technique [0002] Because of its superior anti-interference performance and high frequency band utilization, frequency hopping communication system has been widely used in both civil and military fields. The interference of frequency hopping communication system is an urgent problem to be solved, because the prediction of frequency hopping frequency has the advantages of low interference power requirement and high interference efficiency, and the prediction of frequency hopping frequency is the key to effective interference of frequency hopping communication signals. The performance of the frequency hopping sequence determines the performance of the frequency hopping communication system. The most commonly used construct...
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IPC IPC(8): H04B1/713H04B1/7156
CPCH04B1/713H04B1/7156
Inventor 韩尧庞华吉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA