Two-dimensional spread-spectrum communication method

Abstract

In the method, the two-dimensional spread spectrum module is formed by discrete multicarrier spread spectrum, digital sequence spread spectrum and inverse discrete Fourier transform. The emitting part of the pressure invention is formed by radio frequency emitting part. The other two-dimensional despread spectrum module is formed by inverse discrete multicarrier, digital sequence despread spectrum and discrete Fourier transform, and the receiving part of the present invention is formed by above said two-dimensional despread spectrum module and radio frequency receiving part.

Description

technical field [0001] The invention belongs to the field of using electromagnetic wave technology, such as wireless communication, optical communication, ultrasonic communication, wired communication, etc., and particularly relates to a communication method using spread spectrum. Background technique [0002] As we all know, in the existing communication technology, the spread spectrum method is widely used to achieve the purpose of communication with low probability of interception. The spread spectrum adopts the method of multiplying the spread spectrum code and the original signal to expand the spectrum of the original signal. Therefore, the advantages of the spread spectrum communication method are: the widening of the spectrum means that the probability of intercepting the original signal is reduced; it means that the anti-interference performance is enhanced; it means that the communication bit error rate is reduced; enhanced. [0003] The existing main methods (tec...

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Problems solved by technology

[0009] (1) The expanded spectrum is not uniform, and it is easy for the enemy to detect the specific value of some modulation parameters;

[0010] (2) The probability of being intercepted is not easy to make very low, and it is not easy to use in some occasions;

[0011] (3) It is difficult to realize high spreading gain;

[0012] (4) The design of the spreading gain is inflexible;

[0013] (5) The sampling rate is too high during digital reception;

[0014] (6) Adaptive interference suppression is complex to implement

However, since a frequency-hopping spreading unit and a time-hopping spreading unit are added on the basis of the two-dimensional spreading module, the implementation of this method is very complicated and the cost is also very high.

Especially in many occasions, such as ultrasonic detection, short-distance wireless communication, miniaturized communication systems, etc., it is very uneconomical to use this communication method.

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