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Non-data assistant orthogonal frequency-division multiplexing system frequency offset tracing method

A non-data-assisted, orthogonal frequency division technology, applied in the direction of orthogonal multiplexing system, multi-frequency code system, multiplexing communication, etc., can solve the problem of low frequency band utilization, complex hardware and software Large and other problems, to achieve the effect of small calculation, improved frequency band utilization, and good performance

Inactive Publication Date: 2006-12-27
NANKAI UNIV
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of frequency offset tracking, most of the existing algorithms need to send pilot data, which requires a large amount of calculation, low frequency band utilization, and complex software and hardware implementations.

Method used

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  • Non-data assistant orthogonal frequency-division multiplexing system frequency offset tracing method
  • Non-data assistant orthogonal frequency-division multiplexing system frequency offset tracing method
  • Non-data assistant orthogonal frequency-division multiplexing system frequency offset tracing method

Examples

Experimental program
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Embodiment

[0032] The invention is applied in a 32QAM orthogonal frequency division multiplexing system, and the length of one OFDM symbol is 16 points.

[0033] 1. The receiving end processes the OFDM symbols received in the time domain through frame synchronization, synchronization capture and decyclic prefix processing to obtain the 16-point data signal r of the current symbol n (n=0, 1, . . . , 15). Among them, the synchronous capture adopts the maximum likelihood estimation MLE method, and its formula is:

[0034] Λ(δ', θ)=|γ(m)|-ρφ(m)

[0035] in γ ( m ) = Σ n = m m + N G - 1 r n * · r n + ...

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Abstract

The non-data-assist frequency bias track method for OFDM SYSTEM comprises: to OFDM signal in time domain, synchronizing data frame, synchronous capturing, and removing loop prefix to obtain data signal; converting into frequency-domain carrier signal by FFT, multiplying the sub-carrier signal and compensator output to obtain the modified signal; demodulating and estimating phase difference, using low-pass filter to remove noise effect; finally, multiplying the signal with compensation signal. This invention saves hardware resource, improves frequency utility, and convenient to implementation as low complexity.

Description

technical field [0001] The present invention relates to a frequency offset tracking method, in particular to an Orthogonal Frequency Division Multiplexing (OFDM) system that performs frame synchronization, synchronous capture, and decyclic prefix processing on OFDM symbols received in the time domain to obtain the data signal corresponding to the current OFDM symbol. The current data signal undergoes fast Fourier transform FFT operation to become a subcarrier signal in the frequency domain. The phase difference estimation signal is obtained through the analysis and processing of the signal by the phase difference extractor, and the subcarrier signal is corrected by using the phase difference estimation signal, which is output to the following A non-data-assisted orthogonal frequency division multiplexing system that performs demodulation processing in one step and returns to step a to input the next OFDM symbol at the same time belongs to the technical field of wireless communi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 吴虹袁佳杰赵凤海孙冬艳
Owner NANKAI UNIV
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