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Generation method for frequency domain orthogonal frequency division multiplexing (OFDM) symbol

A frequency domain and symbol technology, applied in the field of wireless broadcast communication, can solve the problems of frequency domain channel estimation performance degradation, etc., to facilitate decoding and demodulation, solve estimation performance degradation, good fractional frequency offset estimation performance and timing synchronization performance Effect

Inactive Publication Date: 2017-06-13
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

Moreover, the DVB_T2 standard proposes that the P1 symbol design based on the CAB time domain structure will cause the performance degradation of the frequency domain channel estimation.

Method used

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  • Generation method for frequency domain orthogonal frequency division multiplexing (OFDM) symbol
  • Generation method for frequency domain orthogonal frequency division multiplexing (OFDM) symbol
  • Generation method for frequency domain orthogonal frequency division multiplexing (OFDM) symbol

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Embodiment Construction

[0042] The inventors have found that the peak average power of the signaling sequence generated using the prior art is relatively high, and the signaling sequence is cyclically shifted or cyclically shifted plus phase shifted in the time domain.

[0043] In view of the above problems, the inventor provides a method for generating frequency-domain OFDM symbols and a method for generating preamble symbols in a physical frame after research. It is avoided that the generated signaling sequence has a characteristic of cyclic shift or cyclic shift plus phase shift in the time domain. And it solves the problem of channel estimation performance degradation in the frequency domain, and uses the OFDM symbols in the time domain to generate modulation signals, so that the generated preamble symbols have good performance in fractional frequency offset estimation and timing synchronization. Further, it is ensured that the receiving end can still process the received signal within the range ...

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Abstract

The invention discloses a generation method for a frequency domain orthogonal frequency division multiplexing (OFDM) symbol. The generation method for the frequency domain OFDM symbol comprises the steps of respectively generating a fixed sequence and a signaling sequence in a frequency region, wherein the fixed sequence and the signaling sequence are constant-modulus sequences, and complex numbers in the fixed sequence and the signaling sequence are equal in modulus; filling the fixed sequence and the signaling sequence into an effective sub-carrier, wherein the fixed sequence and the signaling sequence are arranged in an odd-even staggered manner; and respectively filling zero-sequence sub-carriers on two sides of the effective sub-carrier to form the frequency domain OFDM symbol with predetermined length, wherein in the constant-modulus sequence generation step of the fixed sequence and the signaling sequence, a same sequence generation formula is acquired by endowing a CAZAC sequence with a same root value. According to the technical scheme of the method provided by the invention, a characteristic that the generated signaling sequence has cyclic shift or cyclic shaft and phase shift in the time domain is avoided, and the problem of reduction of frequency domain channel estimation performance is solved.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410177035.2, the application date is April 29, 2014, and the invention name is "the generation method of frequency-domain OFDM symbols and the generation method of leading symbols". technical field [0002] 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 [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 prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/2678H04L27/2691H04L27/2692
Inventor 张文军黄戈徐洪亮
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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