High-carrier and high-modulation-level OFDM sampling frequency offset blind estimation method

A sampling frequency offset and carrier number technology, applied in the field of communication, can solve the problem of demanding signal synchronization

Active Publication Date: 2015-12-23
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology

These two characteristics make the NG-DSL system have a high bandwidth and transmission rat

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  • High-carrier and high-modulation-level OFDM sampling frequency offset blind estimation method
  • High-carrier and high-modulation-level OFDM sampling frequency offset blind estimation method
  • High-carrier and high-modulation-level OFDM sampling frequency offset blind estimation method

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[0045] The present invention will be further described below in conjunction with the accompanying drawings, so as to further explain the technical features and advantages of the method of the present invention. However, embodiments of the present invention are not limited thereto.

[0046] The present invention provides a sampling frequency offset blind estimation method with high estimation accuracy and estimation speed. The specific implementation steps are as follows:

[0047] 1. Determine the OFDM symbol to be estimated

[0048] First, take the mth, m+1, and m+2 OFDM symbols demodulated by IFFT at the receiving end as samples to estimate the normalized sampling frequency offset Δf, among which the m, m+1, and m+2 The selection of OFDM symbols is an empirical value. The estimation algorithm proposed in this paper requires that the sampling frequency deviation of the system should not exceed 20ppm, and the system signal-to-noise ratio should be above 30dB. ,8.

[0049] 2...

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Abstract

The invention relates to a high-carrier and high-modulation-level OFDM sampling frequency offset blind estimation method, and especially relates to a sampling frequency offset blind estimation method based on an NG-DSL system. The method comprises the steps as follows: (1) determining to-be-estimated OFDM symbols demodulated by a receiving end; (2) determining the number M of linear fitting sections and the section length L of each to-be-estimated symbol; and (3) estimating the normalized sampling frequency offset of the system by carrying out segmental linear fitting blind estimation on each symbol. The estimation method of the invention has the advantages of high estimation precision, high convergence speed, and no need for band occupation.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a method for synchronizing the sampling frequency of an OFDM system with a high number of carriers and a high modulation level. Background technique [0002] With the rapid development of the Internet, in order to meet people's growing demand for bandwidth, higher-speed access technology has been put on the agenda. NextGeneration Digital Subscriber Line (NG-DSL, NextGenerationDigitalSubscriberLine) technology is the most important high-speed wired access technology in the future, which can reach an access rate of more than 1Gbps, which will greatly increase the network speed. [0003] NG-DSL system is a baseband OFDM system, and its modulation mode has the characteristics of high sub-carrier number and high QAM modulation. These two features make the NG-DSL system have a high bandwidth and transmission rate, but at the same time make the NG-DSL system have...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 戴宪华陈文琼
Owner SYSU CMU SHUNDE INT JOINT RES INST
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