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
CN102497349BInactive Publication Date: 2015-03-11NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2015-03-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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