Phase correction spread-spectrum process

Abstract

The invention involves a widen frequency method for phase correction, to improve the jamming effect of the existing barrage jamming method. The invention first carries on the fast Fournier transformation on the synchronized signal; then, compare the signal phase; according to the phase error between the transformed signal and the +PN code signal phase value or - the PN code signal phase value, judges whether adjust the spectral line to the +PN code signal phase or -PN code signal phase or not; when the error is smaller than the adjustment threshold value, adjust the spectral line to the +PN code signal phase or -PN code signal phase; obtain the time domain signal after the fast Fourier inverse transformation to the frequency spectrum signal. This invention's phase correction wide frequency method and the traditional adjustment method is compatible, which can reduce 50% on the error rate comparing with the traditional adjustment compensating process and improve the system's performance. The invention has simple method, and is easy to realize on other software radio platform.

Description

technical field [0001] The invention relates to a phase correction spread spectrum method. Background technique [0002] Spread spectrum communication, that is, spread spectrum communication (Spread Spectrum Communication), is to modulate the information data to be transmitted with a pseudo-random code to achieve spectrum expansion before transmission; the receiving end uses the same code for demodulation and related processing to restore the original information data. According to Shannon's (C.E.Shannon) channel capacity formula C=Blog 2 (1+S / N), when the signal-to-noise power ratio of the transmission system decreases in the Gaussian channel, the transmission bandwidth of the system can be increased to obtain a lower information error rate. Spread spectrum communication has special properties such as anti-interference, anti-noise, anti-multipath fading, confidentiality, low power spectral density, concealment and low probability of interception, multiple access multiplex...

AI Technical Summary

Problems solved by technology

[0004] As a spread spectrum system application, such as the anti-jamming ability of the traditional direct sequence receiver (see Figure 1) cannot meet the needs of the application, so improving the anti-jamming ability of the system is of great significance to improve the system performance

Since the traditional correction method is to balance the amplitude-frequency characteristics of the signal and ignore the phase-frequency characteristics of the signal, the effect of suppressing interference cannot meet the needs of the application and needs to be further improved

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