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Preamble symbol generating and receiving methods

A technology of preamble symbols and receiving methods, which is applied in the field of broadcast communication, and can solve problems such as the lack of consideration of the signaling system required for transmission, insufficient system transmission efficiency, and systems that cannot apply coherent decoding.

Active Publication Date: 2016-10-05
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem that the present invention solves is that the preamble symbol transmission method of the prior art causes the system transmission efficiency to be insufficient, and it cannot be applied to a coherent decoding system, 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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  • Preamble symbol generating and receiving methods
  • Preamble symbol generating and receiving methods
  • Preamble symbol generating and receiving methods

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Embodiment Construction

[0055] 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.

[0056] 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 and improve 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 in t...

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Abstract

The invention provides preamble symbol generating and receiving methods. A preamble symbol comprises a format control part. The methods are characterized in that a frequency-domain main sequence ZC is generated according to a predetermined sequence generation rule based on a CAZAC (Constant Amplitude Zero Auto Correlation) sequence; the predetermined sequence generation rule comprises that the sequence is generated by assigning different root values and / or the same root value to the CAZAC sequence; cyclic shift is carried out on the generated sequence; the obtained frequency-domain main sequence ZC is used to transmit signaling needed by the system, and the transmission efficiency is improved; further, a first time-domain symbol in the format control part of the preamble symbol can be a known symbol and can be used to initial channel estimation for coherent detection; and the needed signaling can be also transmitted by selecting the amount of symbols in PFC flexibly according to requirements of the system.

Description

technical field [0001] 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 [0002] 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 physical frame. Symbols, the uses of P1 symbols include: [0003] 1) Make the receiving end detect quickly to determine whether the signal transmitted in the channel is the desired signal; [0004] 2) Provide basic transmission parameters (such as FFT points, frame type information, etc.), so that the receiving end can perform sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
CPCH04J13/0059H04L27/2692
Inventor 张文军黄戈徐洪亮邢观斌郭序峰管云峰何大治
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION