Self-adaptation frequency hopping pattern generation method

Abstract

The invention discloses a self-adaptation frequency hopping pattern generation method. Both parties of communication obtain the same SNR and the same SIR through channel estimation, an adjustment factor Vt of a frequency hopping pattern is generated, an operation is performed on the adjustment factor Vt and a frequency hopping pattern control word rt generated by a pseudorandom sequence generator to obtain a frequency hopping pattern control word t, and the frequency hopping pattern control word t is used for generating the frequency hopping pattern. In the self-adaptation frequency hopping pattern generation method, channel estimation is used for generating the self-adaptation frequency hopping pattern based on channel dynamism, the channel dynamism utilized by the self-adaptation frequency hopping pattern is the special characteristic of the both parties of communication, any third party cannot copy the characteristic, and the interception resisting performance is further improved. More importantly, even if one device is cracked or obtained by the enemy, effective interception and interference cannot be performed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a method for generating an adaptive frequency hopping pattern in a frequency hopping communication system. Background technique [0002] Hopping communication is a spread spectrum communication technology. It divides the communication frequency band into several narrowband sub-channels, and uses the center frequency of the sub-channels to identify these sub-channels. In the communication, the channels corresponding to these frequency points are randomly selected, that is, the period Therefore, it is called frequency hopping communication. Because of its random hopping of instantaneous operating frequency points, it has the advantages of anti-interference and anti-interception, and is widely used in communication fields that require confidentiality. . [0003] The key technologies in frequency hopping communication include frequency hopping synchron...

AI Technical Summary

Problems solved by technology

The former is easy to implement, such as m-sequence, M-sequence, Gold sequence, etc. are realized by linear shifters. In order to generate pseudo-random sequences with longer periods, linear shift registers with more stages are used; the latter uses nonlinear functions The generator obtains a pseudo-random sequence, but it is difficult to guarantee the orthogonality or quasi-orthogonality between different pseudo-random sequences, that is, it is easy to cause overlapping or collision problems between frequency hopping stations in the frequency hopping network, so most of the current Still using a linear generator

[0005] However, the characteristics and sequence structure of these sequences have been very mature research results, and its structure is easy to crack, that is, the enemy can construct all the sequences for matching search, but it is very difficult to actually crack, because: ① The random sequence corresponding to the frequency hopping pattern can be one of all sequences, and the size of the code space makes this exhaustive search infeasible. ② Even if the sequence used is known, the phase tracking of the frequency hopping pattern is in the It is also difficult in the case of very long pattern periods (up to the order of years)

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