Direct sequence spread spectrum pseudo code capturing method, capturing device and communication system

Abstract

The invention discloses a direct sequence spread spectrum pseudo code capturing method. The method comprises a pseudo code storage step, a partial correlation operation step and a total correlation step. In the partial correlation operation step, a plurality of groups of partial correlation operation are completed in at least two continuous periods of initiative pseudo sequence, wherein any group of partial correlation operation is completed in the slot time of receiving at least two continuous code elements of the initiative pseudo sequence, and furthermore, after the previous period finishes, the initiative pseudo code sequence participated in the groups of partial correlation operation abandons a first code element, and then the next period of partial correlation operation is started. Due to the method, and according to the direct sequence spread spectrum pseudo code capturing method, the high-speed and long-period pseudo sequence can be effectively captured with lower cost and difficulty. The invention also discloses a direct sequence spread spectrum pseudo code capturing device.

Description

technical field [0001] The invention relates to the field of spread spectrum communication, in particular to a direct sequence spread spectrum pseudocode acquisition method and device, and also relates to a direct sequence spread spectrum communication system. Background technique [0002] Direct Sequence Spread Spectrum (Direct Sequence Spread Spectrum) communication uses pseudo noise code (Pseudo Noise, also known as PN code or pseudo random code, pseudo code, pseudo random sequence and pseudo code sequence) to perform spread spectrum modulation on the information code to be sent A communication technology that realizes spectrum spread. Because this communication technology has the advantages of strong anti-interference ability and the ability to realize code division multiple access, it has been widely used in communication fields such as modern mobile communication, satellite communication, and satellite positioning and navigation. [0003] In direct-sequence spread spe...

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Problems solved by technology

[0004] However, this method also has certain limitations, that is, each pseudocode code segment will be subjected to a partial matching correlation operation once when entering a DS signal symbol, if the length of the partial matched filter is the length of the entire pseudocode sequence 1 / M, then the operating rate of the partly matched filter should reach M times of the code element rate of the pseudo code, which is in the wideband direct sequence spread spectrum where the code element rate of the pseudo code is relatively high and the period length of the pseudo code sequence is longer. Pseudocode capture is often difficult to achieve

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