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A frame synchronization method, system and transmitting end

A technology of transmitter and receiver, applied in the field of communication, can solve the problems of waste of time and resources, incompatibility, etc., and achieve the effect of avoiding waste

Active Publication Date: 2018-01-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The embodiment of the present invention provides a frame synchronization method, system and transmitting end, aiming to solve the problem that the existing frame synchronization method wastes a lot of time resources and cannot be well compatible with the existing OFDM-based standards

Method used

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  • A frame synchronization method, system and transmitting end
  • A frame synchronization method, system and transmitting end
  • A frame synchronization method, system and transmitting end

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 The implementation flow of the frame synchronization method provided by the first embodiment of the present invention is shown, and the details are as follows:

[0035] The frame synchronization method provided by the embodiment of the present invention specifically includes two parts of the processing process at the transmitting end and the receiving end of the communication system. First, the same frequency-domain constant modulus zero autocorrelation CAZAC sequence is constructed at the transmitting end and the receiving end respectively, At the receiving end, correlation processing is performed on the baseband received signal to obtain the starting position of the frame synchronization sequence. Wherein, the length of the frequency-domain CAZAC sequence is N, and N is an integer power of 2. The specificity of the frequency-domain CAZAC sequence is constructed by formula (1) in the background of the present invention, that is, the frequency-domain CAZAC sequ...

Embodiment 2

[0047] image 3 It shows the implementation flow of the method for acquiring the start position of the frame synchronization sequence provided by the second embodiment of the present invention, specifically based on the above-mentioned first embodiment, the communication between the receiving end and the transmitting end in the first embodiment of the baseband receiving signal A method of performing correlation processing to obtain the starting position of the frame synchronization sequence, and the receiving end will pre-construct and store the same frequency-domain CAZAC sequence C as the transmitting end F , as detailed below:

[0048] In step S301, a signal sequence containing N sampling points is intercepted from any starting position of the baseband received signal, and the signal sequence is subjected to discrete Fourier transform into a frequency domain signal sequence, where N is the frequency domain The length of the inverse discrete Fourier transform of the CAZAC s...

Embodiment 3

[0074] Figure 5 The structure of the frame synchronization system provided by the third embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0075]The frame synchronization system includes a transmitting end 51 and a receiving end 52. A same frequency-domain constant modulus zero autocorrelation CAZAC sequence is respectively constructed in the transmitting end 51 and the receiving end 52, and the receiving end 52 is used for baseband received signals. Processing to obtain the starting position of the frame synchronization sequence, the transmitting end 51 also includes a first acquisition unit 511 of a time domain sequence, a second acquisition unit 512 of a time domain sequence, and a transmission signal generation unit 513, wherein:

[0076] The first time-domain sequence acquisition unit 511 is configured to perform inverse discrete Fourier transform on the freq...

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Abstract

The present invention is applicable to the technical field of communication, and provides a frame synchronization method, system and transmitting end, respectively constructing a same frequency-domain CAZAC sequence at the transmitting end and the receiving end, and processing the baseband received signal at the receiving end to obtain The starting position of the frame synchronization sequence, the transmitting end also includes: performing inverse discrete Fourier transform on the frequency-domain CAZAC sequence to obtain a time-domain CAZAC sequence; obtaining a time-domain CAZAC sequence including a cyclic prefix, wherein the cyclic The prefix is ​​located before the time-domain CAZAC sequence; the time-domain CAZAC sequence including the cyclic prefix is ​​placed in a data frame, a transmission signal is generated, and the transmission signal is transmitted to the receiving end. The present invention inserts a cyclic prefix before the CAZAC sequence in the time domain, and puts it in a data frame and sends it out together, so that the frame synchronization method occupies less time resources and is well compatible with existing standards based on OFDM technology.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a frame synchronization method, system and transmitting end. Background technique [0002] In a digital communication system, after the receiver obtains the high-frequency signal transmitted by the transmitter, it needs to perform operations such as down-conversion and analog-to-digital conversion to form a baseband digital signal for processing. On the receiver, the baseband digital signal consists of a series of signal samples. Each sample point is equivalent to the receiver. The receiver does not know the starting position of the data frame, data time slot, and data block from these samples. Therefore, a time synchronization operation must be performed first to obtain the start position of the frame, time slot, and data block or the start position of the frame synchronization sequence. The traditional time synchronization method can be performed in the time ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L7/00
Inventor 蒋伟克利斯托佛·泰恩
Owner HUAWEI TECH CO LTD