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Method for generating preamble in physical frame

A technology of preamble symbols and physical frames, applied in the direction of multi-frequency code systems, etc., can solve the problems of no cyclic prefix, failure of receiving algorithm detection, inability to apply coherent detection, etc., to solve the problem of degradation of estimation performance, good small frequency offset, good timing Effects of Sync Performance

Inactive Publication Date: 2017-05-24
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0009] The problem solved by the present invention is that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, which cannot be applied to coherent detection, and the preamble symbol has a low probability of failure in the detection of low-complexity receiving algorithms under complex frequency selective fading channels. question

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  • Method for generating preamble in physical frame
  • Method for generating preamble in physical frame

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Embodiment Construction

[0035] The inventors found that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, and there is a problem of failure probability in the low-complexity receiving algorithm detection of the preamble symbols in the frequency selective fading channel.

[0036] In view of the above problems, the inventor provides a method for generating a leading symbol in a physical frame after research. The problem of channel estimation performance degradation in the frequency domain is solved, and the modulated signal is generated by using the part of the OFDM symbols in the time domain, so that the generated preamble symbols have good performance of small frequency offset and timing synchronization. Further, it is ensured that the receiving end can still process the received signal within the range of the carrier frequency deviation from -500kHz to 500kHz.

[0037] In order to make the above objects, features and advantages of the ...

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Abstract

The invention discloses a method for generating a preamble in a physical frame. The method comprises the following steps: obtaining a time domain OFDM symbol; determining the length of a cyclic prefix; intercepting a part of the time domain OFDM symbol with the length of the cyclic prefix from the rear of the time domain OFDM symbol to serve as the cyclic prefix; generating a modulation signal according to the part of the time domain OFDM symbol; and generating the preamble based on the cyclic prefix, the time domain OFDM symbol and the modulation signal. The technical scheme solves the problem of reduced frequency domain channel estimation performance, and generates the modulation signal by using the part of the time domain OFDM symbol, so that the generated preamble has good small frequency offset and timing synchronization performance. Further, it is guaranteed that received signals can stilled be processed within a carrier frequency deviation of-500kHz to 500kHz.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410168180.4, the application date is April 24, 2014, and the name of the invention is "Generation Method of Leading Symbol in Physical Frame". technical field [0002] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating a leading symbol in a physical frame. Background technique [0003] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the sending end, the OFDM system must realize accurate and reliable time synchronization between the sending end and the receiving end. At the same time, since the OFDM system is very sensitive to the frequency offset of the carrier, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 张文军邢观斌黄戈
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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