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Two-dimensional pattern modulation frequency hopping communication method

A technology of frequency hopping communication and two-dimensional patterns, which is applied to electrical components, transmission systems, etc., can solve the problems of information transmission rate limitation, limited anti-reconnaissance ability, and decreased ability of the system to resist different frequency interference, so as to reduce the number of tracked and The probability of interference, the effect of good resistance to partial frequency band interference, and good resistance to multi-tone interference

Active Publication Date: 2019-01-11
ARMY ENG UNIV OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the widespread use of broadband reception also reduces the ability of the system to resist cross-frequency interference
The multi-sequence frequency hopping communication method adopts narrowband reception, which enhances the ability to resist different frequency interference, but its information transmission rate is limited by the speed hopping, high-order modulation needs to increase the receiving channel, the system complexity increases, the frequency hopping period is fixed, and it is anti-reconnaissance limited capacity

Method used

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  • Two-dimensional pattern modulation frequency hopping communication method
  • Two-dimensional pattern modulation frequency hopping communication method
  • Two-dimensional pattern modulation frequency hopping communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 Signal transmission method

[0045] Such as figure 2 As shown, when sending a signal, the sender generates two frequency hopping sequences FS 0 and FS 1 . At time t, when the data sent to data map I after serial-to-parallel conversion is "0", the frequency hopping sequence FS is selected 0 The current frequency f (0,t) send a single frequency signal s 0 (t); when the data sent to the data mapping I after serial-to-parallel conversion is "1", select the frequency hopping sequence FS 1 The current frequency f (1,t) send a single frequency signal s 1 (t). And for each jump, there are two take-off times FT 0 and FT 1 . At time t, when the data sent to data map II after serial-to-parallel conversion is "0", select 0 =i·T hop Send the corresponding single-frequency signal; when the data sent to the data map II after serial-to-parallel conversion is "1", select FT at the take-off time 1 =i·T hop +T s Send the corresponding single frequency signal....

Embodiment 2

[0049] Embodiment 2 Receive signal method

[0050] When receiving a signal, a frequency hopping receiver receives in parallel on multiple channels, each of which is narrowband. Such as image 3 As shown, when M=2, there are 2 receiving channels in total. Each channel has an independent frequency synthesizer, controlled by its own frequency hopping sequence FS i . The reference local oscillator signal output by the frequency synthesizer of the i-th receiving channel is:

[0051]

[0052] In formula (1), Reference local oscillator signal frequency for the i-th receiving channel; is the estimated value of the received signal phase; is the delay T for the received signal d The estimated value of ; k is the time sequence number of the frequency hopping point.

[0053] Assuming that the processing of the frequency hopping receiver on the received signal is linear (generalized), the interference signal and the useful signal can be analyzed separately with the superposit...

Embodiment 3

[0065] The reading of embodiment 3 result

[0066] The result is as Figure 4 shown by Figure 4 It can be seen that when using frequency hopping sequences for information modulation, multiple frequency hopping sequences work together to map the bit symbols to be transmitted into the serial numbers of frequency hopping sequences, and use the difference Random jumping achieves its hiding under tracking interference.

[0067] When using the hopping time for information modulation, divide the time available for frequency point jumping into multiple time slots within a frequency hopping cycle, and map the bit symbols to be transmitted to the sequence number of the current frequency point starting time slot, and the frequency point resides The time remains unchanged, and the difference in the take-off time is used to represent the information.

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Abstract

The present invention relates to a two-dimensional pattern modulation frequency hopping communication method. The method comprises the steps of: in a frequency hopping communication process, mapping sent information bits to two information carrier units consisting of a symbol of a frequency hopping sequence and a symbol of a frequency hopping take-off moment, and employing the frequency domain change and the time domain change of the frequency hopping patterns to represent information so as to achieve time frequency two-dimensional frequency hopping pattern modulation. The two-dimensional pattern modulation frequency hopping communication method can effectively inhibit the frequency hopping modes of tracking interference and part of frequency band interference, has an unequal interval frequency hopping period and is easy to improve the information transmission rate.

Description

technical field [0001] The invention relates to a frequency hopping communication method, in particular to a two-dimensional pattern modulation frequency hopping communication method. Background technique [0002] The frequency hopping technology makes the carrier frequency of the communication signal hop pseudo-randomly, and resists narrow-band blocking interference in an evasive manner. It has strong adaptability and robustness, and has a wide range of applications in the field of anti-jamming wireless communication. However, with the continuous development of communication countermeasures and electronic technology, the jammer has become more and more intelligent, so that it can intercept certain parameters of frequency hopping communication and implement targeted jamming strategies, such as tracking jamming. Tracking interference can cause loss of frequency hopping gain, making frequency hopping communication as fragile as fixed frequency communication, and is the most ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04B1/7136
CPCH04B1/713H04B1/7136H04B2201/713
Inventor 孙慧贤张玉华郭宝锋李召瑞全厚德崔佩璋
Owner ARMY ENG UNIV OF PLA
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