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Time domain ofdm synchronization symbol generation and demodulation method, data frame transmission method

A technology of synchronous symbols and time domain, applied in the direction of multi-frequency code system, etc., can solve the problems of high complexity and large amount of calculation of demodulation method, and achieve the goal of reducing complexity, reducing demodulation complexity, and reducing follow-up workload Effect

Active Publication Date: 2016-07-06
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION +1
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Problems solved by technology

[0006] The problem solved by the present invention is that the demodulation method of the existing OFDM synchronous symbols has a large amount of computation and high complexity

Method used

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  • Time domain ofdm synchronization symbol generation and demodulation method, data frame transmission method
  • Time domain ofdm synchronization symbol generation and demodulation method, data frame transmission method
  • Time domain ofdm synchronization symbol generation and demodulation method, data frame transmission method

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Embodiment Construction

[0021] The inventors found that the existing OFDM synchronization symbol demodulation method has a large amount of computation and high complexity.

[0022] In view of the above problems, the inventor provides a method for generating a time-domain OFDM synchronization symbol and a demodulation method thereof after research. The technical solution reduces the complexity of time-domain OFDM symbol generation, and also reduces the demodulation complexity and improves the demodulation parameter performance.

[0023] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 What is shown is a schematic flowchart of an embodiment of a method for generating a time-domain OFDM synchronization symbol according to the present invention. refer to figure 1 , the generation method of O...

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Abstract

A time-domain OFDM synchronization symbol generation and demodulation method, data frame transmission method, wherein the generation method of the time-domain OFDM synchronization symbol includes generating a CAZAC sequence and its shift sequence; forming a frequency domain based on the CAZAC sequence and the shift sequence of the CAZAC sequence OFDM synchronization symbols; perform inverse Fourier transform on frequency domain OFDM synchronization symbols to form time domain OFDM synchronization training symbols; divide time domain OFDM synchronization training symbols into first part symbols and second part symbols, and divide these two parts symbols respectively Multiplied with a fixed frequency offset to form the prefix and suffix of the time-domain OFDM synchronization symbol; the time-domain OFDM synchronization symbol is formed based on the prefix of the time-domain OFDM synchronization symbol, the OFDM synchronization training symbol and the suffix of the time-domain OFDM synchronization symbol. The technical solution reduces the complexity of OFDM symbol generation, reduces the demodulation complexity and improves the demodulation parameter performance.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for generating a time-domain OFDM synchronization symbol, a demodulation method thereof, and a data frame transmission method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a highly efficient modulation technique that can not only resist frequency selective fading, but also has high spectrum utilization. It has been widely used in wireless broadcasting standards, such as DAB (Digital Audio Broadcasting, DigitalAudioBroadcast ), DVB-T (Digital Video Broadcast-Terrestrial) and the recently proposed second-generation standard DVB-T2 (Digital Video Broadcast-Terrestrial). [0003] The disadvantage of OFDM is that it is very sensitive to timing deviation and frequency offset. If there is timing error in the system, it will cause crosstalk between symbols and data phase rotation; if there is frequency offset, the orthogonalit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 张文军葛建华王丽华刘刚管云峰何大治
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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