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Zero correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search

A technology of sliding window search and initial phase, which is applied in the field of initial phase estimation of zero-correlation zone (ZCZ) sequence based on sliding window search and initial synchronization of receiver spread spectrum sequence to reduce false alarm probability, ensure accuracy and improve efficiency Effect

Inactive Publication Date: 2013-07-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the two-stage search algorithm can only be applied in the direct sequence spread spectrum system (DSSS) using the complete complementary code to construct the ZCZ sequence

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  • Zero correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search
  • Zero correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search
  • Zero correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search

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Embodiment Construction

[0026] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0027] For the quasi-synchronous DS-CDMA system, the received signal is:

[0028]

[0029] Among them, P k is the power of the kth user; b k (t) is the information bit of the kth user; c k (t) is the spreading sequence of the kth user; τ k is the transmission delay of the kth user, that is, the unknown delay to be found by the synchronizer of the kth user; in the quasi-synchronous CDMA system using the ZCZ sequence as the spreading sequence, τ k A chip duration less than half of the zero-correlation window is required; ω c is the carrier frequency; is the initial carrier phase of the kth user; K is the total number of users (k=1,2,...,K).

[0030] The received signal is respectively despread through K matched filter synchronous processors, that is, the user signal is correlated and received respectively. Taking user i as an example, suppose Wh...

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Abstract

The invention provides a zero correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search. The method comprises the steps of determining a sliding range of a sliding window; determining a detecting threshold; finding the maximum amplitude values of sampling points in the current sliding window, moving the center position of the sliding window on the position of the maximum amplitude values; obtaining a checking threshold; judging whether only one peak exists in the sliding window and whether the peak is placed near the center of the sliding window, regarding the code phase in the ZCZ sequence corresponding to the relevant peak as an initial phase if the judging results are yes, and otherwise, carrying out searching. According to the method, zero correlation windows with certain lengths are matched, the unique relevant peak with the certain width in the window is combined, average synchronization time is effectively lowered, high detection efficiency is guaranteed, and false alarm probability is reduced.

Description

technical field [0001] The invention relates to the initial synchronization of a receiver spread spectrum sequence, belongs to the technical field of communication signal processing, and in particular relates to a zero-correlation zone (ZCZ) sequence initial phase estimation method based on sliding window search. Background technique [0002] In a Synchronous Code Division Multiple Access (S-CDMA) system, all user signals are precisely synchronized when they arrive at the receiving end, and multiple access interference between users can be eliminated through reasonable code design, so it has a high system capacity. In an asynchronous code division multiple access (A-CDMA) system, each user accesses randomly, and the relative delay between users is randomly distributed in the entire bit period, and the system capacity is limited by multiple access interference between user signals. In the quasi-synchronous code division multiple access (QS-CDMA) system, although there is a re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7073H04B1/7095
Inventor 高原邱源王帅卜祥元王铁星
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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