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Method for quickly synchronizing OFDM sampling frequencies with high carrier number

A technology of sampling frequency and number of carriers, used in the field of communications

Active Publication Date: 2014-09-17
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the wired OFDM signals, the synchronization performance of the system is mainly affected by the sampling frequency synchronization (synchronization also includes symbol timing synchronization, but this kind of synchronization is easier to solve the impact on the system), especially in high-carrier like NG-DSL, In a high-rate OFDM system, the sampling frequency offset is particularly important to the deviation generated by the system. If the sampling frequency offset cannot be well estimated, the high-speed transmission of the system will be impossible

Method used

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  • Method for quickly synchronizing OFDM sampling frequencies with high carrier number
  • Method for quickly synchronizing OFDM sampling frequencies with high carrier number
  • Method for quickly synchronizing OFDM sampling frequencies with high carrier number

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Embodiment 1

[0058] Such as figure 1 As shown, it is a flow chart of a specific embodiment of a method for fast synchronization of OFDM sampling frequency with a high number of carriers according to the present invention. join figure 1 , a kind of high carrier number OFDM sampling frequency quick synchronization method of the present specific embodiment specifically comprises the following steps:

[0059] S101. Insert multi-bit pilot symbols at the sending end; generally, insert multi-bit pilot symbols at the sending end for estimation of sampling frequency offset according to channel estimation feedback on channel state, preferably 8-bit pilot symbols. Insert pilot at the sender Then the corresponding pilot symbols can be demodulated at the receiving end: Wherein, m represents the mth OFDM symbol, m=1, 2, 3,..., k represents the kth subcarrier, k=0, 1, 2, 3...N-1;

[0060] S102. Perform sampling frequency offset pre-correction on the current symbol using the capture estimate value o...

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Abstract

The invention relates to a method for quickly synchronizing OFDM sampling frequencies with a high carrier number. The method includes the steps that (S1) a pilot frequency symbol is inserted into a sending end, (S2) sampling frequency offset precorrection is carried out on the current symbol by means of a capture estimated value of a previous signal, (S3) a pilot frequency phase difference of corresponding bits is obtained, (S4) sampling frequency offset capture value estimation of the current symbol is carried out through the pilot frequency phase difference, and a current symbol capture value and the previous symbol capture estimated value are summed to obtain a new estimated value, (S6) when the new capture value is larger than a set capture value, sampling frequency offset correction output is carried out on the current symbol by means of the capture estimated value of the current symbol on the basis of a frequency domain correction method, a precorrection signal in the step (S2) is output when the new capture value is smaller than the set capture threshold, and the step from (S2) to (S4) are repeated when a next symbol is updated into the current symbol. By means of the method, real-time high-precision sampling frequency offset correction can be carried out on each OFDM symbol.

Description

technical field [0001] The present invention relates to the technical field of communications, and more specifically, to a fast synchronization method for OFDM sampling frequency with a high number of carriers. Background technique [0002] With the rapid development of Internet technology, applications such as high-definition Internet TV, large-scale online games, and online video conferencing are gradually becoming popular. However, the current network speed in my country is far from enough. We need higher-speed access technology to meet the needs of people. For future bandwidth needs. Next Generation Digital Subscriber Line (NG-DSL, Next Generation Digital Subscriber Line) technology will be the most important high-speed wired access technology in the future. The bandwidth of this access technology will exceed 100M, and the transmission rate will exceed 1Gbps. The combination of land and fiber optic network greatly improves the network speed. [0003] On the physical lay...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 戴宪华符超
Owner SYSU CMU SHUNDE INT JOINT RES INST
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