Frame synchronization method and system for burst OFDM data transmission

A technology for data transmission and frame synchronization, applied in the field of wireless communication, can solve the problems of multiple synchronization header data, limited timing accuracy and frequency offset estimation accuracy, and reduced system efficiency, achieving high detection success probability, saving terminal costs, and reducing complexity. degree of effect

Active Publication Date: 2021-06-01
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +3
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Problems solved by technology

When the signal-to-noise ratio of the expected system is lower than 0dB, the acquisition probability of this scheme is difficult to meet the requirements, and the timing accuracy and frequency offset estimation accuracy are relatively limited, or more synchronization header data needs to be paid, resulting in a decrease in system efficiency and an increase in The storage and logical operation unit requirements and cost of the receiver

Method used

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  • Frame synchronization method and system for burst OFDM data transmission
  • Frame synchronization method and system for burst OFDM data transmission
  • Frame synchronization method and system for burst OFDM data transmission

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Embodiment Construction

[0023] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0024] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0025]In order to overcome the problems in the prior art, the present invention provides a frame synchronization method and system for burst OFDM data transmission, by designing a new type of synchronization header signal, using as little synchronization data as possible to meet the timing accuracy requirements of the terminal and frequency offset estimation accuracy requirements and to achieve a high detection success prob...

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Abstract

The invention discloses a frame synchronization method and system for burst OFDM data transmission. The method includes: a receiver receives air interface data, down-converts and filters it to baseband sampling data, wherein the frame synchronization header of the baseband sampling data includes chirp Chirp signal and constant modulus signal in time domain. The chirp signal includes an upper chirp signal and a lower chirp signal; the receiver performs a synchronous search on the chirp signal; and the receiver performs a synchronous search on the time domain constant modulus signal. The frame synchronization method and system for burst OFDM data transmission of the present invention can satisfy the synchronization of receivers with a signal-to-noise ratio lower than 0 dB or a wide signal-to-noise ratio working range without setting more synchronization header data and without increasing hardware costs Acquisition probability requirements as well as timing accuracy requirements.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a frame synchronization method and system for burst OFDM data transmission. Background technique [0002] Burst OFDM (Orthogonal Frequency Division Multiplexing) data transmission systems often use repetitive sequences to help the receiver do synchronization acquisition. This scheme uses sliding autocorrelation operations. Within a certain range of initial frequency deviation, when the receiving window slides to repeat When the initial position of the signal, the autocorrelation amplitude reaches the maximum, and the angle of the autocorrelation value at this time can estimate the frequency offset. [0003] In the process of implementing the present invention, the inventors found that the synchronization acquisition scheme using sliding cross-correlation usually works in the case of a large signal-to-noise ratio (at least above 0 dB). When the signal-to-noise rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656
Inventor 赵亚红唐晓柯赵东艳王于波赵旭张玉冰袁旭杨季刘继超单鹏刘明
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY
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