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Frequency domain OFDM symbol generation method and preamble symbol generation method

A frequency domain, symbol technology, applied in the field of wireless broadcast communication, can solve the problem of frequency domain channel estimation performance degradation and so on

Inactive Publication Date: 2015-11-04
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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  • Frequency domain OFDM symbol generation method and preamble symbol generation method
  • Frequency domain OFDM symbol generation method and preamble symbol generation method
  • Frequency domain OFDM symbol generation method and preamble symbol generation method

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Embodiment Construction

[0059] 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.

[0060] 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. Moreover, the problem of channel estimation performance degradation in the frequency domain is solved, and the modulation signal is generated by using the OFDM symbol in the time domain, so that the generated preamble symbols have good decimal frequency offset estimation and timing synchronization performance. Further, it is ensured that the receiving end can still process the received signal within the...

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Abstract

The invention discloses a frequency domain OFDM symbol generation method and a preamble symbol generation method. The frequency domain OFDM symbol generation method comprises the steps of: generating fixed sequences and signaling sequences in a frequency domain respectively; filling the fixed sequences and the signaling sequences which are arranged in an odd even interleaving manner to an effective subcarrier; and filling zero-sequence subcarriers on both sides of the effective subcarrier to form a frequency domain OFDM symbol with a preset length. According to the technical scheme provided by the invention, the frequency domain OFDM symbol generation method and preamble symbol generation method prevent the generated signaling sequences from having a property of circular shift or circular shift plus phase shift in a time domain, solves the degradation problem of channel estimation performance of the frequency domain, and further ensures that a receiving end can process and receive signals when carrier frequency deviation ranges from -500kHz to 500kHz.

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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IPC IPC(8): H04L27/26H04L5/00
CPCH04J13/0059H04J13/14H04L27/261H04L27/2613H04L27/2662H04L27/2692
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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