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Generation method of preamble symbols and generation method of frequency-domain OFDM symbols

A technology of frequency domain and symbol, applied in the field of wireless broadcast communication, can solve the problems of no cyclic prefix, failure of receiving algorithm detection, inapplicability of coherent detection, etc., and achieve the effect of easy decoding and demodulation

Active Publication Date: 2016-01-27
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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  • Generation method of preamble symbols and generation method of frequency-domain OFDM symbols

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Embodiment approach

[0043] Further, this embodiment also provides a preferred implementation manner for generating each signaling sequence subset in the above step S124, specifically as follows:

[0044] Step S1241: Determine the root value in the CAZAC sequence generation formula based on the number of signaling sequences; wherein the root value is greater than or equal to twice the number of signaling sequences.

[0045] In practice, root is a prime number, and preferably root=L, so that the autocorrelation value of the sequence is zero.

[0046] Step S1242: According to the selected root value, select a group of different q values ​​to generate a CAZAC sequence, wherein the number of q values ​​is equal to the number of signaling sequences, and the value of q value is an integer greater than 0 and less than the root value, any The sum of the two q values ​​is not equal to the root value;

[0047] Step S1243: Carry out cyclic shift on the generated CAZAC sequence; wherein, the number of bits o...

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Abstract

The invention discloses a generation method of frequency-domain OFDM symbols and a generation method of preamble symbols in physical frames. The generation method of the frequency-domain OFDM symbols includes the following steps that: the average power ratio of a fixed sequence and a signaling sequence is determined; fixed sequences and a signaling sequence set are respectively generated in the frequency domain according to the average power ratio R; one signaling sequence is selected from the signaling sequence set, and the fixed sequences and the signaling sequences fill effective sub carriers, odd-even staggered arrangement exists between the fixed sequences and the signaling sequences; two sides of the effective sub carriers are filled with zero-sequence sub carriers respectively to form a frequency domain OFDM symbol with a preset length; and the serial number of the selected signaling sequence in the set is the signaling information carried by OFDM symbols. With the generation methods provided by the technical scheme of the invention adopted, the problem of failure probability in low-complexity receiving algorithm detection on preamble symbols in a frequency selective fading channel in the current DVB_T2 standard and other standards can be solved.

Description

technical field [0001] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating OFDM symbols in the frequency domain and a method for generating leading symbols in physical frames. 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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/261H04L27/2613
Inventor 张文军徐洪亮黄戈邢观斌何大治管云峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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