Novel digital pseudo code synchronization method for spread spectrum microwave receiver

A microwave receiver and pseudo-code synchronization technology, which is applied to electrical components, transmission systems, etc., can solve problems such as performance degradation, missed capture, and wrong lock

Inactive Publication Date: 2015-03-04
FUJIAN INTERNET OF THINGS SCI RES INST
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Problems solved by technology

If a fixed threshold is adopted, when demodulating to the autocorrelation sidelobe, the performance will drop, and when

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  • Novel digital pseudo code synchronization method for spread spectrum microwave receiver
  • Novel digital pseudo code synchronization method for spread spectrum microwave receiver
  • Novel digital pseudo code synchronization method for spread spectrum microwave receiver

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Embodiment Construction

[0042] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0043] As a specific example, such as figure 1 As shown, the system flow chart of the method for digitizing pseudo-code synchronization of a novel spread spectrum microwave receiver of the present invention has been schematically illustrated. The present invention adopts FPGA and software radio technology, and proposes a method for direct sequence digital spread spectrum microwave receiver A novel digital PN code synchronization method. The design of the system uses 1023-bit gold sequence as the spreading code, the code rate is 10.24M, and the receiving and spreading code rate is generated by frequency division of the system clock. The acquisition and tracking loop is mainly composed of a digital matched filter module, a PN code generator module, an adaptive threshold detection module and a phase tracking module. A kind of novel spread spectrum mic...

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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...

Claims

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Application Information

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IPC IPC(8): H04B1/7075
Inventor 李铁军邵桂芳庄弘唐孝
Owner FUJIAN INTERNET OF THINGS SCI RES INST
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