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

A technology of synchronization symbols and data frames, applied in multi-frequency code systems and other directions, can solve the problems of high complexity and large amount of calculation of the demodulation method, so as to reduce the complexity, reduce the complexity of demodulation, and improve the performance of demodulation parameters. Effect

Active Publication Date: 2014-01-22
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION +1
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AI Technical Summary

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

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Embodiment Construction

[0022] The inventors found that the existing OFDM synchronization symbol demodulation method has a large amount of computation and high complexity.

[0023] 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.

[0024] 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.

[0025] 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

Provided is a time domain OFDM synchronization symbol generation and demodulation method, and a data frame transmission method. The time domain OFDM synchronization symbol generation method comprises that a CAZAC sequence and a shifting sequence are generated; a frequency domain OFDM synchronization symbol is formed based on the CAZAC sequence and the shifting sequence of the CAZAC sequence; fourier inverse transformation is performed on the frequency domain OFDM synchronization symbol so that a time domain OFDM synchronization training symbol is formed; the time domain OFDM synchronization training symbol is divided into a first part symbol and a second part symbol, and the two part symbols are respectively multiplied by a fixed frequency deviation so that a prefix and a suffix of a time domain OFDM synchronization symbol are formed; and 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. Complexity of OFDM symbol generation is reduced by the technical scheme, demodulation complexity is reduced and demodulation parameter performance is enhanced.

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 an efficient modulation technique that can not only resist frequency selective fading, but also has high spectrum utilization, and has been widely used in wireless broadcasting standards such as DAB (Digital Audio Broadcasting, Digital Audio Broadcast), DVB-T (Digital Video Broadcast-Terrestrial), and the recently proposed second-generation standard DVB-T2 (second-generation terrestrial digital television broadcast). [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 offse...

Claims

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Application Information

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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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