Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method

A technology of Q-CCSK and spread spectrum communication, applied in electrical components, transmission systems, etc., can solve the problem of low frequency spectrum utilization of Chirp spread spectrum communication

Active Publication Date: 2014-06-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low frequency spectrum utilization in traditional C

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  • Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method
  • Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method
  • Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method

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Embodiment Construction

[0032] The technical solution of the present invention will be explained below in conjunction with the accompanying drawings and embodiments.

[0033] The Q-CCSK spread spectrum communication method of a kind of noise-like Chirp base that the present invention proposes is as figure 2 shown. Utilizing the characteristics of large time-width-bandwidth product of Chirp signal and insensitivity to Doppler frequency shift, based on the quasi-orthogonality between Chirp-BOK technology positive and negative frequency modulation Chirp signals, low interception can be achieved by making Chirp signals like noise Secure communication, and introduce CCSK technology to improve the spectrum utilization and information transmission rate of the system.

[0034] Combining with the definition and properties of Chirp spread spectrum matched filter demodulation, the principle analysis and theoretical derivation process of the present invention are given below.

[0035] Assuming that the code len...

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Abstract

The invention relates to a noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method, and belongs to the technical field of wireless communication. According to the method provided by the invention, due to the good autocorrelation characteristic of noise-like Chirp signals and the mutual correlation characteristic of the noise-like Chirp signals at different frequency modulation rates, the noise-like Chirp signals are used as a base function of Q-CCSK spread spectrum modulation; therefore the Doppler tolerance is greater, and the great Doppler frequency offset can be resisted, so that the signal capturing time under a high dynamic environment is shortened, and the safety of the wireless communication is improved; as the information is carried for signal sectional cyclic displacement through a Q-CCSK modulation technique, the frequency band utilization rate of spread spectrum communication is effectively improved.

Description

technical field [0001] The invention relates to a noise-like Chirp base quadrature cyclic shift keying (Q-CCSK) spread spectrum communication method, which belongs to the technical field of wireless communication. Background technique [0002] In the high-dynamic aerospace TT&C environment, there is high-speed relative motion between the TT&C station and the TT&C target, so the TT&C signal will have a large Doppler frequency deviation. The correlation performance of traditional spread spectrum TT&C signals is greatly affected by Doppler frequency offset (the Doppler tolerance is only 1 / 2 of the reciprocal of the correlation time), so the acquisition process requires a two-dimensional search of frequency and delay. Greatly increased, the real-time performance of measurement and control is seriously affected. Chirp signal is also called linear frequency modulation signal, and its related process is not sensitive to Doppler frequency shift. Therefore, applying Chirp signal to ...

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Application Information

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IPC IPC(8): H04B1/707
Inventor 郇浩王腾陶然袁少波
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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