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A Time-Frequency Overlapped Gaussian AM Communication Signal Separation Method

A technology of Gaussian amplitude modulation and communication signal, which is applied in the field of signal processing to achieve the effect of high estimation accuracy and high precision

Active Publication Date: 2017-12-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Due to the shortcoming that a suitable state-space model must be established, this method is not suitable for blind separation of single-channel time-frequency overlapping Gaussian AM signals [Wang S Y, Feng J C.A novel method of estimating parameter and its application to blind separation of chaotic signals, Acta Phys.Sin.,2012,61:170508]

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  • A Time-Frequency Overlapped Gaussian AM Communication Signal Separation Method
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[0038] 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.

[0039] Below in conjunction with accompanying drawing and embodiment the patent of the present invention is further described.

[0040] Such as Figure 1-2 As shown, the present invention provides a time-frequency overlapping Gaussian AM communication signal separation method, comprising the following steps:

[0041] Step 1: Establish a signal model, and transform the solution process of the mixed signal into a process of solving multidimensional variable parameters; the received mixed signal x(t) is converted into M (M≥2) Gaussian amplitude modulation source signals, the expression is as follows :

[0042]

[0043] in, Indicates the amplitude modulation coefficient of each source signal component, t 0 Indicates the tim...

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Abstract

The invention provides a time-frequency overlapped Gaussian amplitude modulation communication signal separation method. The method comprises the following step: I, building a signal model, converting a received mixed signal into a plurality of Gaussian amplitude modulation source signals, and transforming a solving process of the mixed signal into a process of solving a multi-dimensional variable parameter; II, calculating an initial value of the multi-dimensional variable parameter with a genetic algorithm; III, calculating an optimal value of the multi-dimensional variable parameter with a minimum value search method; and IV, calculating each source signal according to the optimal value of the multi-dimensional variable parameter. Through adoption of the method, separation of single-channel time-frequency overlapped Gaussian amplitude modulation communication signals can be realized effectively. According to the method, the Gaussian amplitude modulation communication signal model is built firstly; initial values of parameters needing to be estimated are solved; the optimal values of the parameters needing to be estimated are searched with the method; and the Gaussian amplitude modulation source signals are recovered according to the obtained optimal values.

Description

technical field [0001] The invention relates to the technical field of signal processing in which ultra-wideband wireless communication signals coexist in channels, and in particular to a method for separating single-channel time-frequency overlapping Gaussian amplitude modulation communication signals. Background technique [0002] Ultrawideband (UWB) communication is a major breakthrough in the field of wireless communication, which realizes high-speed data transmission based on high bandwidth. Compared with other wireless communication systems, it has many advantages and potentials such as high spatial spectrum efficiency, high ranging accuracy, low intercept probability, high resistance to multipath fading, low power consumption, low cost and small size. In the actual UWB communication signal reception, with the excessive use of wireless spectrum resources, the signal will be more dense, and multiple signal components often exist in the co-channel in the form of time-fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7163
Inventor 陈晓支亚京
Owner NANJING UNIV OF INFORMATION SCI & TECH
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