Novel digital pseudo code synchronization method for spread spectrum microwave receiver

Abstract

The invention relates to the technical field of wireless communication, in particular to a novel digital pseudo code synchronization method for a spread spectrum microwave receiver. The novel digital pseudo code synchronization method for the spread spectrum microwave receiver includes steps that capturing, to be specific, using the auto-correlation features of PN codes to compare a received signal with local PN codes in sequence, performing the correlation operation, after detecting the related results and performing self-adapting threshold detection, regulating the phases of local spread spectrum codes, and turning to a tracking step after meeting the self-adapting threshold requirement through detection and amplitude detection; tracking, to be specific, using the correlation between the phase of the code element advancing the local spread spectrum code sequence by 1 / 2 and the phase of the code element lagging behind the local spread spectrum code sequence by 1 / 2 and the received signal to obtain an error control signal, wherein the error control signal is used as a phase discrimination result to be input to a code element clock generator to regulate the PN code phases and keep the rigid synchronization between the local PN codes and the received signal. The novel digital pseudo code synchronization method for the spread spectrum microwave receiver is capable of eliminating the phase error so as to realize the precision of the phases of the local spread spectrum sequence and received sequence and the consistency there-between to realize the best receiving effect.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for synchronizing digitized pseudo codes of a novel spread spectrum microwave receiver. Background technique [0002] In spread spectrum communication, the synchronization of pseudorandom noise code (PN code) is the prerequisite for the normal operation of the receiver. The synchronization process generally consists of two parts: acquisition and tracking. Acquisition is coarse adjustment, which can make the local code sequence and the received code sequence roughly synchronized, and the general phase error is within 1 / 2 symbol length. Tracking is fine-tuning, which further reduces the phase error of the symbol at the transceiver end, achieves precise synchronization and maintains this synchronization during the entire transmission process. The acquisition and tracking of the phase of the spread spectrum sequence is the key technology of the spread spectr...

AI Technical Summary

Problems solved by technology

If a fixed threshold is adopted, when demodulating to the autocorrelation sidelobe, the performance will drop, and when demodulating to the cross-correlation peak, it will cause wrong lock, and even cause missed and miscaptured situations.

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