Wide gap frequency hopping sequence generation method based on ranking and resetting

Abstract

The invention provides a wide gap frequency hopping sequence generation method based on ranking and resetting. According to the invention, a prior pseudorandom sequence is ranked in a segmented manner according to the number of frequency points in a frequency set and a sequence number sequence is generated. Then the sequence number sequence is subjected to gap resetting according to gap width, so that a wide gap frequency hopping sequence is generated. The frequency hopping sequence generated according to the invention can meet requirements for wide gaps and has good sequence uniformity, Hamming relevance and gap distribution uniformity, and overcomes a shortcoming that a prior wide gap frequency hopping sequence always has poor statistics performance partially.

Description

technical field [0001] The invention belongs to the technical field of frequency hopping communication and is used for the design of wide interval frequency hopping sequences. Background technique [0002] Frequency hopping communication is a spread spectrum communication method that uses pseudo-random sequences to control carrier frequency hopping. It has good anti-interference ability and multi-access networking performance, and is widely used in military and civilian communication fields. In specific engineering applications, wide interval frequency hopping is usually required, that is, the frequency interval between two adjacent frequency hopping frequency points is greater than a predetermined value. Widely spaced frequency hopping can better resist narrowband interference, tracking interference, blocking interference and multipath fading. Frequency hopping in frequency hopping communication is controlled by frequency hopping sequence, which has a decisive impact on th...

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Problems solved by technology

Because the middle part of the frequency band is not used in the middle frequency band method, the sequence uniformity is poor and the spectrum utilization rate is low; the random translation substitution method encounters a narrow point in frequency hopping (the frequency interval between two adjacent frequency hopping frequency points is less than a predetermined value), then Translate according to the current frequency hopping code value, and move to a position that meets the wide interval requirement. Random translation instead of wide interval frequency hopping sequence has better Hamming correlation, but the translation process makes the uniformity of the frequency hopping sequence worse; the dual frequency band method Divide all frequencies into two dual frequency banks. When the frequency hopping encounters a narrow point, it will hop to the dual frequency point of the current frequency point. The dual frequency bandwidth interval frequency hopping sequence has better uniformity and Han However, the dual transformation has caused the degradation of the distribution characteristics of the frequency hopping interval to a certain extent.

The currently commonly used wide-interval frequency hopping sequences always have some defects in statistical performance, and it cannot guarantee that all statistical performance is good

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