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A low-complexity high-speed OFDM signal time-frequency synchronization method and system

A time-frequency synchronization, low-complexity technology, applied in the field of communication, can solve the problem of high-digit multiplier resources and high algorithm complexity, and achieve the effect of easy algorithm, saving multipliers, and reducing algorithm complexity

Active Publication Date: 2020-04-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a low-complexity high-speed OFDM signal time-frequency synchronization method and system, and solve the problems of using high-digit multiplier resources and high algorithm complexity in the prior art

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  • A low-complexity high-speed OFDM signal time-frequency synchronization method and system
  • A low-complexity high-speed OFDM signal time-frequency synchronization method and system
  • A low-complexity high-speed OFDM signal time-frequency synchronization method and system

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Embodiment Construction

[0043] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0044] Such as figure 1 As shown, a low-complexity high-speed OFDM signal time-frequency synchronization method, the steps of the method are as follows:

[0045] S1. Generate two identical ZC training sequences at the transmitter, and add a cyclic prefix CP;

[0046] S2. Perform time synchronization and frequency synchronization at the receiving end using delayed autocorrelation, and output the synchronization result.

[0047] Such as figure 2 with image 3 As shown, the S2 includes a time synchronization step, a frequency synchronization step and a synchronization result output step.

[0048] The specific steps of the described time synchronization step are as follows:

[0049] S211, the time synchronization step receives the time-fr...

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Abstract

The invention discloses a low-complexity high-speed OFDM signal time-frequency synchronization method and system. The steps of the method are as follows: S1, generate two identical ZC training sequences at the transmitting end, and add a cyclic prefix CP; S2, at the receiving end Time synchronization and frequency synchronization are simultaneously performed by using delayed autocorrelation, and the synchronization result is output. The system includes a transmitting end and a receiving end; the transmitting end is used to generate two identical ZC training sequences; the receiving end is used to synchronize the time-frequency signal and the frequency signal. Under the condition of low signal-to-noise ratio, compared with before 1bit quantization, the time synchronization performance has no obvious decline. The time synchronization and frequency synchronization operate on the same training sequence, which reduces the length of the synchronization sequence and has excellent time synchronization performance. It has the characteristics of reducing the complexity of the algorithm, saving multipliers and register resources, making the algorithm easier to implement, and being able to overcome the channel environment with large frequency offset.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a low-complexity high-speed OFDM signal time-frequency synchronization method and system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) technology, as an effective broadband transmission technology, is a mobile communication technology that utilizes parallel transmission to increase the transmission rate of communication data. At present, it has attracted much attention in the field of communication, and has been widely used in wireless local area network, digital audio broadcasting, digital video broadcasting and other fields. [0003] The basic idea of ​​this technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel. In this way, although the overall channel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2671H04L27/2672
Inventor 马万治陈雨生潘文生沈莹赵宏志
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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