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Digital random multi-frequency-point frequency hopping and time hopping information transmission method and system

A technology of information transmission and multi-frequency points, which is applied in the direction of digital transmission system, transmission system, and transmission path for multiple use, so as to achieve the effect of improving dimensionality and enhancing anti-interception performance

Active Publication Date: 2020-02-18
NORTHWEST UNIV(CN)
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  • Abstract
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  • Application Information

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Problems solved by technology

In recent years, digital frequency hopping communication technology has developed rapidly. The existing digital frequency hopping communication technology uses random allocation of subcarriers to complete frequency hopping, and its frequency hopping set dimension still has great room for improvement.

Method used

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  • Digital random multi-frequency-point frequency hopping and time hopping information transmission method and system
  • Digital random multi-frequency-point frequency hopping and time hopping information transmission method and system
  • Digital random multi-frequency-point frequency hopping and time hopping information transmission method and system

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Embodiment 1

[0041] This embodiment 1 provides a digital random multi-frequency point frequency hopping scheme, the process is as follows figure 1 As shown, the structure diagram of the digital random multi-frequency point frequency hopping time hopping scheme is as follows figure 2 As shown, the specific steps are as follows:

[0042] Step 1: sampling N-bit signal;

[0043] Step 2: Build an N-point FFT module. Perform N-point fast Fourier transform on the sampling signal;

[0044] Build the frequency hopping pattern generation module. The frequency hopping pattern generation module generates discrete uniform random integers from 1 to M through the MATLAB function unidrnd. The principle diagram of frequency hopping pattern generation is as follows: image 3 shown. First initialize the number of sampling times as i=0, and generate a discrete uniform random integer c from 1 to M by the unidrnd function; then increase the number of sampling times i by 1, and judge whether i is equal to ...

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Abstract

The invention provides a digital random multi-frequency-point frequency hopping and time hopping signal transmission method and system. The method comprises the steps of sampling N-bit signals, building an N-point FFT module, building a frequency hopping pattern generation module, building a data cache module, building a subcarrier mapping module and building an IFFT module. Aiming at the problemsthat the dimension of a frequency hopping set is small and the like, an OFDM (Orthogonal Frequency Division Multiplexing)-based digital frequency hopping communication technology is adopted, the dimension of the frequency hopping set is improved in a mode of caching data before subcarrier mapping and then remapping, and the purpose of enhancing the anti-interception performance of a frequency hopping system is achieved.

Description

technical field [0001] The invention belongs to the technical field of frequency hopping communication, and relates to a digital random multi-frequency point frequency hopping time hopping information transmission method. Background technique [0002] Frequency hopping communication technology refers to a communication method in which the carrier frequency of the transmission signal transmitted by both parties is controlled by a pseudo-random code and is discretely changed according to a predetermined rule. This communication method was originally proposed by Hedy Lamarr during World War II and applied for a patent, but it was not gradually practical until the 1970s, and was first adopted in military communication. In wireless communication systems such as GSM and Bluetooth, in order to eliminate the influence of individual user channel degradation or reduce the influence of interference between channels, frequency hopping technology is used. The anti-intercept performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L1/00H04B1/713
CPCH04B1/713H04L1/0071H04L5/0008H04L5/0094
Inventor 赵武赵洪毅马晓龙关欣万超马雨宸曲浩然齐晓斐张志勇
Owner NORTHWEST UNIV(CN)
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