Method and system for realizing high-security fast frequency-hopping transmission

A frequency hopping and fast technology, applied in transmission systems, multi-frequency code systems, electrical components, etc., can solve problems such as weak anti-interception ability, and achieve the effect of high throughput rate, low bit error rate, and enhanced confidentiality.

Inactive Publication Date: 2012-08-15
NANJING UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to propose a relatively mature IDFT technology in digital signal processing to realize Method and system for fast frequency hopping transmission with high security

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  • Method and system for realizing high-security fast frequency-hopping transmission
  • Method and system for realizing high-security fast frequency-hopping transmission
  • Method and system for realizing high-security fast frequency-hopping transmission

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Embodiment Construction

[0070] Specific embodiments of the present invention are described below. In an effort to provide a concise description of these implementations, not all features of an actual implementation are described in this document. It should be recognized that during the development of any actual implementation, some other application-specific decisions may have to be made in order to comply with specific system and business-related constraints. These specific decisions, which could be complex and time consuming, are routine tasks of design, fabrication, and production to those of ordinary skill having the benefit of this disclosure.

[0071] The purpose of frequency hopping communication is to realize the confidentiality and anti-interference of information transmission. The present invention absorbs the common IFFT technology from OFDM technology and DMT technology, so that the carrier signal generator is not needed when performing frequency hopping communication modulation, thereby...

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Abstract

The invention discloses a method and system for realizing high-security fast frequency-hopping transmission. According to the method, during the transmission of data, a transmitting terminal carries out bit, modulation mode and power distribution on subcarrier clusters of data to be transmitted according to carrier frequency-hopping information specified by a current time slot, then, all subcarrier data are transmitted to a receiving terminal through digital-to-analog (D/A) conversion after all of the subcarrier data are mapped to a time domain by using an IFFT (Inverse Fast Fourier Transform) method, and the processing process of the receiving terminal is an inverse process of the transmitting terminal. The system disclosed by the invention comprises a carrier frequency-hopping information generation device, a subcarrier data dynamic allocation device, a subcarrier data dynamic demodulation device, an IFFT module, an FFT (Fast Fourier Transform) module, a D/A converter, an analog-to-digital (A/D) converter, a transmitting module and a receiving module. The frequency-hopping system disclosed by the invention has the advantages that a frequency hopping rate much higher than that of the conventional single-carrier frequency-hopping communication system can be generated, the concealment performance of frequency-hopping signals is high, the anti-interception capacity is strong, and the availability of a communication system is high. Meanwhile, according to the method and the system for realizing the high-security fast frequency-hopping transmission, the utilization rate of a wireless spectrum is increased because a plurality of subcarriers are used for simultaneous transmission.

Description

technical field [0001] The invention belongs to a method for realizing frequency-hopping transmission, in particular to a method and a system for realizing high-secrecy and fast frequency-hopping transmission based on multi-carrier technology. Background technique [0002] Frequency hopping transmission refers to a wireless information transmission method in which "the carrier frequency used to carry data information can continuously hop according to a certain frequency hopping pattern". Since the selection range of the carrier frequency is much larger than the bandwidth of the baseband signal, and the carrier stays at a specific frequency point for a short time, it is difficult to detect an instantaneous carrier signal. At the same time, by transmitting related data on different carrier frequencies, frequency diversity can be used to combat interference. The spread spectrum communication system based on frequency hopping technology can effectively resist all kinds of man-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/713
Inventor 陈相宁徐超永郝丽芳
Owner NANJING UNIV
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