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Sampling frequency offset estimation method based on pilot frequency

A technology of sampling frequency offset and pilot frequency, which is applied in the field of communication, can solve the problems of demanding signal synchronization, etc., and achieve the effects of enhanced smoothing effect, quasi-estimation effect, and high accuracy of frequency offset estimation

Active Publication Date: 2018-01-19
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two characteristics make the NG-DSL system have a high bandwidth and transmission rate, but also make the NG-DSL system have very strict requirements for signal synchronization

Method used

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  • Sampling frequency offset estimation method based on pilot frequency
  • Sampling frequency offset estimation method based on pilot frequency
  • Sampling frequency offset estimation method based on pilot frequency

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 Shown, the concrete steps of the method that the present invention proposes are as follows:

[0037] a) The sender sends the same pilot data, namely X m-1,k =X m,k , X m,k Indicates the transmission data on the kth subcarrier of the mth OFDM symbol;

[0038] b) Take m OFDM symbols at the receiving end, and make a quotient of the received signals in the frequency domain at the same pilot position of adjacent OFDM symbols;

[0039] Wherein, the specific method for finding step b) is as follows:

[0040] When there is a sampling frequency deviation between the sending and receiving ends, the sampling time will be offset, and the offset will gradually increase with the increase of the symbol number and the number of sampling points. Let the sampling period of the receiving end be T s '=T s +ΔT s , where ΔT s For the sampling interval deviation at both ends of the transceiver, the normalized sampling interval deviation is defined as The unit is on...

Embodiment

[0097] This embodiment has carried out simulation experiment to the method of embodiment 1, specifically as follows:

[0098] In an NG-DSL system with a line length of 50m, the length of each OFDM data bit is 2048 (FFT / IFFT length), the system modulation level is 1024QAM, and the normalized sampling frequency offset is 0.5ppm, 1ppm, and 5pm. A simulation of the performance of the new sampling frequency estimation in the case of .

[0099] Compare the present invention with two traditional methods, method 1 is the sampling frequency synchronization method proposed in the document "Estimation and compensation of frequency offset in DAC / ADC clocks in OFDM systems", referred to here as the shafiee algorithm; method 2 is the document "Decision -directed finesynchronization in OFDM systems "proposed sampling frequency synchronization method, here referred to as the direct type algorithm.

[0100] image 3 , 4, 5, 6, and 7 are the estimated curves of these three algorithms in the c...

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Abstract

The invention provides a sampling frequency offset estimation method based on a pilot frequency, which can obtain a good estimation effect in such NG-DSL (Next Generation Digital Subscriber Line) environment with a high sub-carrier number and a high modulation level. Estimation accuracy, a convergence rate and algorithm stability are all greatly promoted.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a pilot-based sampling frequency offset estimation method. 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. Next Generation Digital Subscriber Line (NG-DSL, Next Generation Digital Subscriber Line) technology is the most important high-speed wired access technology in the future, which can achieve 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 very strict requirements for signal synchronization. Among w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/26
Inventor 戴宪华唐诗
Owner SUN YAT SEN UNIV
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