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
CN106850486AInactive Publication Date: 2017-06-13SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
Publication Date
2017-06-13
Estimated Expiration
Not applicable · inactive patent

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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.
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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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