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Multi-carrier communication system adaptive anti-interference synchronization method facing interference scene

A multi-carrier communication and self-adaptive technology, applied in the field of communication, can solve problems such as easy synchronization errors, and achieve the effect of improving synchronization performance

Pending Publication Date: 2022-07-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the synchronization signal of the traditional OFDM system is prone to synchronization errors in a communication scenario where there is interference, and proposes an adaptive anti-interference synchronization method for a multi-carrier communication system oriented to interference scenarios

Method used

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  • Multi-carrier communication system adaptive anti-interference synchronization method facing interference scene
  • Multi-carrier communication system adaptive anti-interference synchronization method facing interference scene
  • Multi-carrier communication system adaptive anti-interference synchronization method facing interference scene

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specific Embodiment approach 1

[0064] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. The adaptive anti-interference synchronization method for a multi-carrier communication system oriented to an interference scenario described in this embodiment specifically includes the following steps:

[0065] at the sender

[0066] Step A1, the preset number of IFFT points modulated by the OFDM system is N ifft , the number of available subcarriers in the communication bandwidth is N c , where N c ifft ;

[0067] Step A2, the Zadoff-Chu sequence is used as the synchronization sequence in the frequency domain, and the length of the Zadoff-Chu sequence is N ZC , the root exponent is M;

[0068] Step A3, from N of Step A1 c K different subcarriers are preset in the available subcarriers, and the preset K subcarriers are used as the center frequency of the synchronization sequence;

[0069] Among them, the preset K subcarriers satisfy the conditions (1) and (2):

[0070] (1) The distance between two adjacent su...

specific Embodiment approach 2

[0093] Embodiment 2. The difference between this embodiment and Embodiment 1 is that the expression of the Zadoff-Chu sequence is:

[0094]

[0095] In the formula, j is the imaginary unit, N ZC is an odd number, the root exponent M is an integer, n=0,1,…,N ZC -1, ZC(n) represents the nth value in the Zadoff-Chu sequence.

[0096] Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0097] Embodiment 3. The difference between this embodiment and Embodiment 1 or 2 is that the step A4 is implemented by a channel sensing technology.

[0098] Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention discloses a multi-carrier communication system self-adaptive anti-interference synchronization method oriented to an interference scene, and belongs to the technical field of communication. According to the invention, the problem that the synchronization error of the synchronization signal of the traditional OFDM system is easy to occur in the communication scene with interference is solved. According to the invention, the frequency point position of the synchronization signal is dynamically adjusted in real time by adjusting the subcarrier mapping, so that the adaptive avoidance of the interference signal is realized, and the correct synchronization of the system is realized, so that the communication system can correctly complete the subsequent signal receiving and processing. Compared with an OFDM (Orthogonal Frequency Division Multiplexing) system with a fixed synchronization signal frequency point, the method disclosed by the invention can greatly improve the synchronization performance of the system in a communication scene with interference by avoiding the interference signal in real time. The method can be applied to self-adaptive anti-interference synchronization of the multi-carrier communication system.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to an adaptive anti-jamming synchronization method for a multi-carrier communication system oriented to an interference scenario. Background technique [0002] Synchronization plays a vital role in the wireless communication process. For multi-carrier communication systems (OFDM systems), timing synchronization is often the first step in baseband processing at the receiver, and the accuracy of the timing synchronization position affects the system performance of subsequent signal processing at the receiver. The synchronization signal of the OFDM system can be generated by using the Zadoff-Chu sequence, and this synchronization sequence can only occupy a small bandwidth relative to the bandwidth of the entire communication system. The synchronization signal of the traditional OFDM system often uses a fixed frequency point, but in a communication scenario with interf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2655H04L27/2691H04L27/2657Y02D30/70
Inventor 房宵杰廖壮壮沙学军张桐张传斌
Owner HARBIN INST OF TECH
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