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Generation method for frequency domain OFDM symbol

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

Inactive Publication Date: 2017-06-13
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 for frequency domain OFDM symbol
  • Generation method for frequency domain OFDM symbol
  • Generation method for frequency domain OFDM symbol

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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 for a frequency domain OFDM symbol. The generation method for the frequency domain OFDM symbol comprises the following steps of determining an average power ratio of fixed sequences to signaling sequences; respectively generating the fixed sequences and a signaling sequence set on the frequency domain according to the average power ratio R; selecting one signaling sequence from the signaling sequence set and filling an effective subcarrier with the fixed sequences and the signaling sequences, wherein the fixed sequences and the signaling sequences are arranged in an odd-even interleaving manner; and respectively filling zero-sequence subcarriers at two sides of the effective subcarrier to form a frequency domain OFDM symbol with a preset length, wherein a sequence number of the selected signaling sequence in the set is signaling information carried by the OFDM symbol. According to the technical scheme, the problem of detection failure probability of a precursor symbol in a frequency selective fading channel by using a low-complexity receiving algorithm in the current DVB_T2 standard and other standards is 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 ...

Claims

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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
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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