Device and method for real-time capturing of narrow-band interference resistance long-code spread spectrum synchronous head

Abstract

The invention discloses a device and method for real-time capturing of a narrow-band interference resistance long-code spread spectrum synchronous head so as to implement real-time capturing of the synchronous head in a complex communication environment and in a long-code spread spectrum communication system, improve capturing efficiency and meanwhile, reduce the capturing complexity. The capturing device and method adopt the steps of: synchronous head data is generated and transmitted, and a receiving end carries out interference suppression on the received data; a shifting register carries out serial storage and parallel output on the data obtained after interference suppression; a despreading module carries out despreading on the data; a RAM unit sequentially stores and carries out parallel output on the data obtained after despreading; a sequence and sign regulation module carries out regulation of sequences and signs on the regulated data; a parallel low-pass filter module carriesout filtering on the regulated data; a parallel FFT module carries out parallel FFT operation on the filtered data; a module value obtaining and maximum value selection module carries out module value obtaining and maximum module value selection on a FFT result; and a judgment module judges whether the synchronous head is successful in capturing.

Description

Technical field [0001] The invention belongs to the field of communication technology processing, and relates to an anti-narrowband interference long-code spread spectrum synchronization head real-time acquisition device and method, which can be used in covert communication or burst communication system for narrowband interference, long-code spread spectrum information Real-time synchronous capture. Background technique [0002] Spread Spectrum (Spread Spectrum) communication technology was produced in the mid-1950s, and the initial application field was mainly military communication. The basic theory of Shannon's information theory shows that spread spectrum communication is a very effective anti-jamming communication method, that is, the so-called bandwidth exchange for channel capacity. Its characteristic is that the bandwidth used to transmit information is much larger than the bandwidth of the information itself. Spread-spectrum communication technology uses pseudo-random c...

AI Technical Summary

Problems solved by technology

Spread spectrum will lead to wider bandwidth, and inevitably there will be narrow-band interference, which will cause great problems in subsequent synchronization head capture and bit error rate. In addition, because covert communication is to be realized, covert communication is to hide information as much as possible, even It is completely hidden in the noise, which requires a relatively low signal-to-noise ratio. In this case, long codes are required to obtain high gain, but at the same time it will bring problems such as high capture complexity

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