Single-channel time-frequency overlapping signal blind separation method

A blind separation, single-channel technology, applied in baseband system components, shaping networks in transmitters/receivers, etc.

Active Publication Date: 2015-12-16
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Due to the shortcomings of establishing a suitable state-space model, this method is not suitable for blind separation of single-channel time-frequency overlapping Gaussian AM signals (WangSY, FengJC. Anovelmethodofestimatingparameteranditsapplicationtoblindseparationofchaoticsignals,ActaPhys.Sin.,2012,61:170508)

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  • Single-channel time-frequency overlapping signal blind separation method
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  • Single-channel time-frequency overlapping signal blind separation method

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Embodiment Construction

[0046] In order to better understand the technical features, technical content and technical effects of the present invention, the accompanying drawings of the present invention will now be described in more detail in conjunction with the embodiments.

[0047] Below in conjunction with accompanying drawing and embodiment the patent of the present invention is further described.

[0048] Such as figure 1 As shown, the present invention provides a method for blind separation of single-channel time-frequency overlapping signals, comprising the following steps:

[0049] Step 1, establish a signal model, and convert the received mixed signal x(t) into one composed of M Gaussian AM source signals, the expression is as follows:

[0050] x ( t ) = Σ i = 1 M k a i ...

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Abstract

The invention provides a single-channel time-frequency overlapping signal blind separation method. The single-channel time-frequency overlapping signal blind separation method comprises the following steps: step 1, establishing a signal model and converting received mixed signals into a plurality of Gauss amplitude modulation source signals; step 2, calculating a joint maximum likelihood function of the mixed signals and changing the solving process of the mixed signals to a process of solving a multidimensional variable parameter; step 3, estimating a time domain center and a time width modulation parameter of each source signal base on signal characteristics; step 4, calculating an initial value of the multidimensional variable parameter; step 5, calculating an optimal value of the multidimensional variable parameter; and step 6, calculating the Gauss amplitude modulation source signals. The single-channel time-frequency overlapping signal blind separation method is a multidimensional variable parameter estimation method with a pre-estimated hybrid genetic-minimum value search algorithm; and the time width modulation parameter P of the source signal and the time domain center t0 of the source signal are firstly subjected to pre-estimation, and then the other parameters are calculated by using the genetic algorithm and the minimum value search algorithm. Therefore, the rate of convergence and the calculation accuracy are improved.

Description

technical field [0001] The invention relates to the field of communication signal processing, in particular to a method for blind separation of single-channel time-frequency overlapping signals. Background technique [0002] In the modern information age, with the development of communication technology and the rapid growth of global communication services, the communication environment is complicated, the use of spectrum resources is tense, and the types of interference noise are diversified; thus, in order to obtain a single signal component, signal The separation of components further makes single-channel time-frequency aliasing signals common in communication application environments such as co-channel interference in communication. The traditional blind source separation algorithm and the time-frequency domain, space domain and code domain filtering methods that use array signal MIMO system processing are no longer applicable, so it is necessary to blindly separate such...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 陈晓支亚京
Owner NANJING UNIV OF INFORMATION SCI & TECH
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