Anti-interference signal detection and synchronization method for OFDM system based on cross-correlation detection of local sequence

A local sequence and signal detection technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as peak detection failure, and achieve moderate computational complexity, good capabilities, and good robustness.

Inactive Publication Date: 2018-05-15
NAT UNIV OF DEFENSE TECH +1
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Problems solved by technology

However, these methods are largely inapplicable when the system is disturbed, because the interfering signals (e.g., single-tone interference, multi-tone interference, etc.) often have repetitive structures, which will cause the peak detection of autocorrelation to fail

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  • Anti-interference signal detection and synchronization method for OFDM system based on cross-correlation detection of local sequence
  • Anti-interference signal detection and synchronization method for OFDM system based on cross-correlation detection of local sequence
  • Anti-interference signal detection and synchronization method for OFDM system based on cross-correlation detection of local sequence

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[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] The embodiment of the present invention discloses an OFDM system anti-jamming synchronization method based on local sequence cross-correlation, and its training sequence structure is as follows: figure 2 As shown, it includes a short-symbol local sequence cross-correlation calculation unit, a coarse frequency offset estimation and compensation unit, a lo...

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Abstract

The invention relates to an anti-interference signal detection and synchronization method for an OFDM system based on cross-correlation detection of a local sequence. A peak value of a cross-correlation value of a received signal and the local sequence is used as a judgment basis for signal detection and system synchronization, compared with delay self-correlation of the received signal, the influence of a signal-to-noise ratio and an interference signal on the cross-correlation value of the received signal and the local sequence is smaller, so that an algorithm can adapt to signal changes, aproblem of frame loss caused by a self-correlation scheme of the received signal can be effectively relieved, and furthermore, the method also has good capability of resisting noise and interference,the phenomenon that a large amount of synchronization errors are generated under the condition that interference and noise exist can be avoided, the robustness is good, and the relevant performance isverified in an actual system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication systems, in particular to an OFDM system anti-interference signal detection and synchronization method. Background technique [0002] The OFDM system model diagram is as follows figure 1 , The data sent by the system is processed by channel coding, QAM mapping, IFFT and adding CP to obtain OFDM signals, and then transmitted through wireless channels. The receiving end must first perform synchronous processing on the received signal, estimate and compensate the symbol timing and carrier frequency deviation, so as to ensure that the subsequent QAM demapping, channel decoding and other processing are performed correctly. [0003] OFDM system synchronization mainly includes symbol timing synchronization and carrier synchronization. The purpose of symbol timing synchronization is to enable the receiving end to obtain the same sequence of symbol periods at the sending end, so as to be abl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2659H04L27/266H04L27/2663H04L27/2665H04L27/2675H04L27/2688H04L27/26132
Inventor 辜方林魏急波王建熊俊马东堂
Owner NAT UNIV OF DEFENSE TECH
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