Method and apparatus for generating and receiving frequency domain direct enlarging - fractional number field frequency-hopping mixing signal

Abstract

Disclosed are frequency domain direct spread and fractional Fourier domain hopping signal generation and receiving methods and the device thereof, avoiding the defects in current frequency domain direct sequence spreading and fractional Fourier domain frequency hopping. The signal generation method includes the steps: two branches of binary numerical signals are acquired from a signal source; direct sequence spectrum spreading is carried out to the first branch of signals so as to obtain direct sequence spread spectrum signals; frequency hopping is carried out to the second branch of signals so as to obtain fractional Fourier domain frequency hopping signals; the two branches of signals are added to each other, thus getting composite spread spectrum outputting signals. The signal receiving method includes the steps: the received signals are de-hopped so as to get de-hopped signals; then the received signals sequentially undergo p-Fourier transform, peak value deprivation, fractional 2-2p-Fourier transform, peak value deprivation again, fractional p-2-Fourier transform, de-spreading and demodulation, thus getting de-spread signals; the de-spread signals and the de-hopped signals undergo parallel-to-serial conversion so as to get the original user signals. The signal generation and receiving methods and the device combine two spread spectrum techniques and increase the concealment of the system.

Description

technical field [0001] The invention relates to a hybrid spread spectrum technology in wireless communication, in particular to a method and device for generating and receiving hybrid spread spectrum signals of frequency domain direct sequence-fraction domain frequency hopping. Background technique [0002] Direct sequence spread spectrum and frequency hopping are two common communication methods in spread spectrum communication systems. These two basic spread spectrum communication systems have their own advantages and disadvantages. The advantage of the direct spread system is that it has good signal concealment and strong anti-interference ability, and is suitable for broadband digital systems. The disadvantage is that the near-far effect is serious, and communication cannot be established with the narrowband system; The system has good anti-multipath performance and no obvious near-far effect and is suitable for instantaneous narrowband systems. The disadvantages are poo...

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Problems solved by technology

[0013] The present invention solves the shortcomings of the two methods of frequency domain direct sequence spread spectrum and fractional domain frequency hopping, and provides a new method for mixing spread spectrum signals and a signal transceiver device, that is, frequency domain direct spread-fractal domain Method and device for generating and receiving frequency hopping mixed signal

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