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Multi-strategy-combined OFDM (Orthogonal Frequency Division Multiplexing) frame synchronization method

A frame synchronization and multi-strategy technology, applied in the field of communication, can solve the problems of frame detection performance degradation, timing synchronization position accuracy degradation, etc., to achieve the effect of reducing computing overhead, ensuring accuracy, and improving the probability of correct detection

Inactive Publication Date: 2015-03-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Due to the diversity of interference signal types, if a single frame synchronization method is selected, it will easily lead to a decrease in frame detection performance and a decrease in timing synchronization position accuracy

Method used

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  • Multi-strategy-combined OFDM (Orthogonal Frequency Division Multiplexing) frame synchronization method
  • Multi-strategy-combined OFDM (Orthogonal Frequency Division Multiplexing) frame synchronization method
  • Multi-strategy-combined OFDM (Orthogonal Frequency Division Multiplexing) frame synchronization method

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Embodiment Construction

[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0020] Such as figure 1 , figure 2 and image 3 As shown, the joint multi-strategy OFDM frame synchronization method of the present invention adopts a joint multi-strategy method to realize frame synchronization in the OFDM system, that is, at first the received signal sequence is respectively subjected to symbol cross-correlation calculation, delayed autocorrelation calculation and energy calculation , and then through the preset cross-correlation decision threshold, autocorrelation decision threshold (fixed threshold), and adaptive decision threshold for detection and judgment, after the OFDM frame signal arrives, perform a peak search on the delayed autocorrelation calculation result value to determine the timing position , and finally adjust the position of the received signal sequence according to the timing position to obtain a synchronous output signal.

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Abstract

The invention discloses a multi-strategy-combined OFDM (Orthogonal Frequency Division Multiplexing) frame synchronization method, which can be used for effectively resisting wrong synchronization caused by interferences of noise, carrier frequency offsets, same-frequency signals and the like and meets the requirement of frame synchronization of an OFDM system. The method comprises the following steps of: (1) performing symbol cross-correlation operation on a received signal sequence and a local training sequence, performing time delay auto-correlation operation on the received signal sequence, and performing energy operation on a time delay received signal sequence; (2) judging and detecting a cross-correlation operation result and a preset cross-correlation judgment threshold T1, judging and detecting an auto-correlation operation result and a preset auto-correlation judgment threshold T2, and judging and detecting the auto-correlation operation result and a self-adaptive judgment threshold T3; (3) when frame arrival is detected, searching for a peak value of the auto-correlation operation result to obtain a timing position; and (4) adjusting the position of the received signal sequence according to the timing position to obtain a frame synchronization output signal.

Description

technical field [0001] The invention relates to a synchronization technology in the field of communication, in particular to a joint multi-strategy OFDM frame synchronization method of orthogonal frequency division multiplexing suitable for broadband data transmission. Background technique [0002] In recent years, OFDM has become a hotspot in broadband wireless communication research due to its advantages of high spectrum utilization rate, strong resistance to frequency selective fading and narrowband interference, and has been widely used in broadcast audio and video fields and civil communication systems. However, OFDM systems are more sensitive to synchronization errors than single-carrier systems. Synchronization technology is usually divided into frame synchronization and frequency synchronization, and frame synchronization can be subdivided into frame detection and timing synchronization. Among them, frame detection is used to determine whether the OFDM frame signal a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 魏急波王德刚熊春林吴宇王欣唐燕群张晓瀛
Owner NAT UNIV OF DEFENSE TECH
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