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OFDM signal bandwidth blind estimating method

A signal bandwidth and bandwidth estimation technology, which is applied to baseband system components, multi-frequency code systems, etc., can solve the problem of large amount of calculation, and achieve the effect of reduced computational complexity and better noise cancellation effect

Inactive Publication Date: 2013-07-10
XIDIAN UNIV
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Problems solved by technology

Although this method has a high correct estimation rate, it has a large amount of calculation

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  • OFDM signal bandwidth blind estimating method
  • OFDM signal bandwidth blind estimating method
  • OFDM signal bandwidth blind estimating method

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Embodiment Construction

[0019] Please refer to figure 1 , the OFDM signal used in the present invention is DVB-T OFDM signal 2K FFT mode.

[0020] Assuming that after passing through the multipath channel, the received baseband OFDM signal is:

[0021] r ( t ) = Σ l = 0 L - 1 h l ( t ) s ( t - τ l ) + μ ( t ) - - - 1 )

[0022] where μ(t) is additive Gaussian white noise, h l (t) is the multipath complex gain, τ l is the path delay of multipath, L is the number of...

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Abstract

The invention discloses an OFDM signal bandwidth blind estimating method which includes the following steps. Firstly, a received OFDM signal undergoes Welch changing and a power spectrum is obtained. Secondly, the obtained power spectrum undergoes EMD decomposition and multiple IMF components are obtained. Thirdly, a threshold lambda of IMF variance contribution rate is set. IMF components of which the IMF variance contribution rates are smaller than lambda are removed. By means of reserved IMF components, filtering and noise abating are performed and an OFDM signal power spectrum is reconstructed. Fourthly, a differential of the reconstructed power spectrum is worked out. Positions of the maximum value and the minimum value of an impulse are abstracted and respectively serve as a starting point and a closing point of an OFMD signal passband and a differential value of the maximum value and the minimum value is the width of the passband so that the width of the OFDM signal is estimated. Fifthly, multiple circulation times are set, the previous four steps are repeated and an average statistics value of the bandwidth is estimated and serves as an estimated value of a precise bandwidth of the OFMD signal.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a low-complexity OFDM signal bandwidth blind estimation method in a multi-path channel with low signal-to-noise ratio, which can be used for OFDM system demodulation and frequency spectrum monitoring in non-cooperative communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology with high frequency band utilization. It has the advantages of anti-noise, anti-multipath, and suitable for high-speed data transmission. Therefore, OFDM technology is getting more and more popular in the field of communication. The wider the application. In a non-cooperative communication system, accurate OFDM signal bandwidth parameters are of great significance for frequency spectrum monitoring and OFDM system reconstruction. Therefore, the present invention discloses a method for blind estimation of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 李兵兵刘明骞张阳陈硕任晓楠
Owner XIDIAN UNIV
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