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Generation method for preamble symbol and receiving method

A preamble symbol and symbol technology, applied in the field of wireless broadcast communication, can solve problems such as inapplicability of coherent detection, failure of receiving algorithm, no cyclic prefix, etc., and achieve good timing synchronization performance, solve performance degradation, and good frequency offset estimation performance.

Active Publication Date: 2016-07-06
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 DVB_T2 time domain structure. The problem of failure probability of low-complexity receiving algorithm detection of preamble symbols in complex frequency-selective fading channels

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  • Generation method for preamble symbol and receiving method

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Embodiment Construction

[0045] 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, which cannot be applied to coherent detection, and the low-complexity receiving algorithm detection of the preamble symbol has a problem of failure probability in complex frequency selective fading channels.

[0046] In view of the above problems, the inventor provided a method for generating and receiving preamble symbols after research, which solves the problem of performance degradation of non-coherent detection, has good decimal frequency offset estimation performance and timing synchronization performance, and can also avoid The problem of small bias estimation failure in some special-length multipath channels ensures that the delay correlation can be used to obtain obvious peaks at the receiving end, avoiding the above-mentioned situation of false detection of peaks.

[0047] In order to make the above objects, features and adv...

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Abstract

The invention provides a generation method for a preamble symbol and a receiving method. The method comprises: on the basis of an obtained time-domain main body signal, a time domain symbol having any one of two three-segment structures; and a preamble symbol is generated based on one or two time domain symbols. The two three-segment structures are as follows: one three-segment structure is formed by a main body, a prefix generated based on the rear part of the main body, and a postfix generated and modulated based on the rear part of the main body; and the other three-segment structure is formed by a main body, a prefix generated based on rear part of the main body, and a super prefix generated and modulated based on the rear part of the main body. A common preamble symbol is generated based on one time domain symbol; and a reinforced preamble symbol is generated in a splicing mode based on two time domain symbols having the different three-segment structures. Besides, the receiving method of a receiving terminal includes: a physical frame is processed to obtain a baseband signal; whether an expected common or reinforced preamble symbol exists in the baseband signal is determined; and if so, the position of the preamble symbol in the physical frame is determined and carried signaling information is solved.

Description

technical field [0001] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating and receiving a preamble symbol. Background technique [0002] 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 the carrier frequency offset. [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 receive...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L1/00
CPCH04L5/0048H04L27/26H04L27/2607H04L27/2613H04L27/2692
Inventor 张文军邢观斌黄戈徐洪亮
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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