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Leading symbol generation method

A preamble symbol and sequence generation technology, applied in the field of broadcast communication, can solve problems such as insufficient system transmission efficiency, failure to consider the needs of the signaling system required for transmission, and systems that cannot apply coherent decoding, etc.

Inactive Publication Date: 2017-05-31
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The problem solved by the present invention is that the preamble symbol transmission method in the prior art causes insufficient system transmission efficiency, and is not applicable to coherent decoding systems, and does not consider transmitting the required signaling by selecting the number of time domain symbols of the preamble symbol to suit system needs

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Embodiment Construction

[0056] The inventors found that the preamble symbols in the prior art have problems such as low transmission efficiency, insufficient transmission flexibility, poor initial timing synchronization performance, inability to implement coherent decoding, and thus poor decoding performance at low SNR.

[0057] In view of the above problems, the inventor provided a method for generating and receiving preamble symbols after research. The design of the preamble symbols not only improves the timing synchronization performance of the preamble symbols, but also utilizes the characteristics of the cyclic prefix to implement coherent decoding, which improves the Receive performance issues in most cases. At the same time, signaling is transmitted in both the time domain and the frequency domain, the frequency domain implements signaling transmission through various methods, and the time domain can implement emergency broadcast signs. At the same time, by flexibly using the number of symbols...

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Abstract

The present invention provides a leading symbol generation method. The method is characterized in that a frequency domain main sequence ZC is generated based on a constant envelope zero autocorrelation sequence CAZAC according to a predetermined sequence generation rule, wherein the predetermined sequence generation rule includes: assign different root values to the constant envelope zero autocorrelation sequence CAZAC so as to generate the frequency domain main sequence ZC and / or assign the same root value to the constant envelope zero autocorrelation sequence CAZAC so as to generate the frequency domain main sequence ZC; and cyclic displacement is performed on the generated sequence so as to generate the frequency domain main sequence ZC, and the obtained frequency domain main sequence ZC is used for transmitting the signal required by the system, so that the transmission efficiency is improved.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201510064118.5, the filing date of the original application is 2015 / 02 / 06, and the invention-creation name of the original application is "Method for generating and receiving leading symbols". technical field [0002] The invention belongs to the field of broadcast communication, and in particular relates to a method for generating and receiving a leading symbol and a corresponding device. Background technique [0003] At present, the method for realizing time synchronization between the transmitting end and the receiving end in the OFDM system is basically based on preamble symbols. The preamble symbol is a symbol sequence known to both the sender and the receiver of the OFDM system. The preamble symbol marks the beginning of the physical frame (named P1 symbol), and only one P1 symbol or multiple P1 symbols appear consecutively in each physi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04J13/0059H04L27/2692
Inventor 张文军黄戈徐洪亮
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION