Dual mode variant step blind balance method based on orthogonal wavelet packet transform
A technology of wavelet packet transformation and variable step size, applied to electrical components, transmission systems, etc., can solve problems such as difficult to distinguish details, achieve the effects of reducing mean square error, fast convergence speed, and improving convergence performance
Inactive Publication Date: 2009-07-08
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology
However, since the wavelet transform only decomposes the scale space, when the high-frequency part of the signal is rich in information, since this division divides the high-frequency into one frequency band, the details are difficult to distinguish
Method used
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Embodiment 1
[0065] Example 1: Reconstituted Water Acoustic Channel
[0066] Such as image 3 As shown, the channel is c=[e -0.7j 0 0 0.3e -1.8j ]; the transmitted signal is 4QAM; the weight length of the equalizer is 16, and the signal-to-noise ratio is 20dB; image 3 shown.
[0067] Table 1 Simulation parameter values
[0068]
Embodiment 2
[0069] Example 2: Minimum Phase Underwater Acoustic Channel
[0070] Such as Figure 4 As shown, the channel is c=[0.9656 0.0906 0.0578 0.2368]; the transmitted signal is 32QAM; the weight of the equalizer is 16, and the signal-to-noise ratio is 20dB; Figure 4 shown.
[0071] Table 2 Simulation parameter values
[0072]
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The invention discloses a double-modulus variable step-size blind equalization method based on orthogonal wavelet packet transformation (WPT-VDMA). The method achieves the effect of switch between the constant-modulus blind equalization algorithm based on orthogonal wavelet packet transformation (WPT-CMA) and the decision directed blind equalization algorithm based on orthogonal wavelet packet transformation (WPT-DD) by means of the symbol judgment, thereby reducing the mean square error; and the method accelerates the convergence rate of the WPT-CMA by employing the output signal power as the variable step-size of the independent variable, thereby further improving the convergence property of the WPT-VDMA algorithm. The method has the advantages of high convergence speed and small mean square error.
Description
technical field [0001] The invention relates to a dual-mode variable-step-length blind equalization algorithm, in particular to a dual-mode variable-step-length blind equalization method based on orthogonal wavelet packet transformation. Background technique [0002] In underwater acoustic digital communication, multipath effect and limited bandwidth will cause serious inter-symbol interference (ISI), which reduces the underwater data transmission rate and reliability. Therefore, equalization techniques must be used to improve communication quality. At present, blind equalization technology that does not need to transmit periodic training sequences is a research hotspot in the field of underwater acoustic communication. The convergence speed and mean square error are the main factors affecting the performance of the equalizer. Therefore, scholars at home and abroad have proposed many methods to improve the convergence speed and reduce the mean square error. Literature [1]...
Claims
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Inventor 郭业才纪娟娟
Owner NANJING UNIV OF INFORMATION SCI & TECH
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