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Short-wave time-varying channel fading bandwidth estimation method

A time-varying channel and fading bandwidth technology, which is applied in baseband systems, baseband system components, transmission monitoring, etc., can solve the problems of low frequency resolution of frequency domain signals and blurred frequency domain signal envelopes, and achieve accurate Channel fading bandwidth, accurate estimation, and beneficial effects for engineering realization

Active Publication Date: 2020-12-01
西安烽火电子科技有限责任公司
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Problems solved by technology

These algorithms all need to use complex mathematical transformations. At the same time, affected by the transformation accuracy and noise, the frequency domain signal has the disadvantages of low frequency resolution and blurred frequency domain signal envelope.

Method used

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  • Short-wave time-varying channel fading bandwidth estimation method
  • Short-wave time-varying channel fading bandwidth estimation method
  • Short-wave time-varying channel fading bandwidth estimation method

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Embodiment Construction

[0047] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0048] In order to clearly describe the method for estimating the fading bandwidth of short-wave time-varying channels proposed by the present invention, the system model and the concept of "time scale" introduced by the present invention are briefly introduced first.

[0049] 1. System model

[0050] The code word of the user message u to be transmitted after channel coding is c=(c 0 ,c 1 ,...,c j ,...,c k-1 ),c j ∈{0,1}, and then perform BPSK modulation to obtain the mapped symbol x=(x 0 ,x 1 ,...,x j ,...,x k-1 ). where x j =1-2c j ,(x j =±1), k is the code word length. Assuming that the channel has a total of n'+m'+1 steps, there are n' steps before the m...

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Abstract

The invention belongs to the field of short-wave communication, and discloses a short-wave time-varying channel fading bandwidth estimation method, which comprises the following steps: tracking a channel by utilizing the existing channel estimation algorithm, such as a least mean square error algorithm, a recursive least square algorithm and a sequence autocorrelation algorithm, and recording a channel track at each moment; secondly, using a given 'time scale' for measuring a channel track obtained through tracking, and therefore obtaining the zero-crossing rate under the corresponding 'time scale'; and finally, traversing the scales, when the length of the time scale and the fading bandwidth of the real channel form a resonance relationship, generating a peak value (namely the maximum value of the zero-crossing rate) in an obtained result, and determining the fading bandwidth of the short-wave time-varying channel according to the maximum value of the zero-crossing rate. According tothe method, complex mathematical changes are not needed, the fading bandwidth of the short-wave time-varying channel is estimated from the perspective of time domain, the fading bandwidth of the time-varying channel can be accurately estimated by utilizing the introduced time scale concept, and the method is simple and easy to implement and beneficial to engineering implementation.

Description

technical field [0001] The invention relates to the field of shortwave communication, in particular to a method for estimating shortwave time-varying channel fading bandwidth, which is used for estimating channel fading bandwidth that changes with time from the perspective of time domain. Background technique [0002] Shortwave communication refers to a radio communication technology with a wavelength of 10-100 meters and a frequency range of 3-30MHz. The radio waves emitted by short-wave communication must be reflected by the ionosphere to reach the receiving end. The communication distance is relatively long, and it is the main means of long-distance communication. Despite the continuous emergence of new radio communication systems, short-wave communication, an ancient and traditional communication method, is still widely valued by the whole world. Not only has it not been eliminated, but it is still developing rapidly. Because it has advantages that other communication s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/309H04B17/391H04L25/02
CPCH04B17/309H04B17/3911H04L25/0222
Inventor 张凯陈测库
Owner 西安烽火电子科技有限责任公司
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