Method for capturing spread spectrums in multipath environment

A spread spectrum and environmental technology, applied in the field of spread spectrum acquisition, can solve the problems affecting the stability of the communication system and increase the system acquisition time, and achieve the effect of increasing the system acquisition time, reducing the system acquisition time and improving the system stability.

Inactive Publication Date: 2013-01-30
TSINGHUA UNIV
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Problems solved by technology

This will also increase the system acquisition time, thereby affecting the stability of the entire communication system
Even if some improved schemes can be used to capture one of the paths with greater energy, in a dense multipath environment, such as an ultra-wideband indoor communication environment, the energy of each path is relatively small, which will still increase the system acquisition time. Affect the stability of the entire communication system

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  • Method for capturing spread spectrums in multipath environment
  • Method for capturing spread spectrums in multipath environment
  • Method for capturing spread spectrums in multipath environment

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] According to an embodiment of the present invention, a schematic block diagram of the flow of the differential coherence-based multipath-assisted spread spectrum acquisition method is as follows: figure 2 As shown, the method includes the following steps:

[0030] 1) The system is in the search phase. In the search phase, the local code sequence and the received code sequence are matched and filtered. Each sampling period T s Both output a related result. Of course, it can also be implemented by using a parallel matched filter structure, that is, M correlation results are output every M sampling periods. The output of the matched filter for the nth sampling pe...

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Abstract

The invention discloses a method for capturing spread spectrums in multipath environment, comprising the following steps of: S1, matching and filtering local code sequences and received code sequences and outputting the relevant result of a matched filtering in each sampling period; S2, merging the multipath energy according to the relevant result of the matched filtering in each sampling period to obtain the value of the merged multipath energy, outputting the value of once merged multipath energy in each code sequence period and then comparing the merged multipath energy with a first threshold, if the former is less than the latter, comparing the merged multipath energy obtained after delaying one code sequence period with the first threshold until the merged multipath energy is greater than the first threshold, and then executing S3; and S3, comparing the value of the merged multipath energy obtained in S2 with a preset second threshold after delaying one code sequence period, if the former is greater than the latter, the capturing is successful, and otherwise, continuously executing S1 after delaying one code sequence period. The method can shorten the capturing time of a system and improve the stability of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a spread spectrum acquisition method in a multipath environment. Background technique [0002] Spread spectrum capture is one of the most critical technologies in spread spectrum systems, also called coarse synchronization. The purpose of spread spectrum acquisition is to roughly estimate the phase of the received code sequence in order to adjust the phase of the local code sequence so that the difference between the phase of the local code sequence and the phase of the received code sequence is within 1 chip. The entire uncertain phase region is composed of several in-phase phases (H 1 ) and out-of-phase phase (H 0 )composition. h 1 The phase indicates the phase of the local code sequence within 1 chip of the phase difference from the received code sequence, and H 0 It means that the difference between the phase of the received code sequence and the phase of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7073H04B1/7093
Inventor 肖振宇张家琦金德鹏朱亮苏厉曾烈光
Owner TSINGHUA UNIV
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