Channel estimation denosing method for single carrier frequency domain equalization under shortwave communication channel

A channel estimation, shortwave channel technology, applied in multi-frequency code systems, baseband system components, etc., can solve the problem of not being able to eliminate Gaussian noise well, and achieve the effect of improving system performance and accurate channel estimation

Inactive Publication Date: 2015-03-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0009] The present invention provides a single-carrier frequency domain equalization method for channel estimation and denoising in shortw...

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  • Channel estimation denosing method for single carrier frequency domain equalization under shortwave communication channel
  • Channel estimation denosing method for single carrier frequency domain equalization under shortwave communication channel
  • Channel estimation denosing method for single carrier frequency domain equalization under shortwave communication channel

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Embodiment Construction

[0035] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0036]The shortwave channel selected in the embodiment is the harsh shortwave channel proposed by the International Wireless Consultative Committee (CCIR), and the specific parameters are as follows: Figure 6 shown. Due to the harshness of the short-wave channel and the influence of Gaussian noise, it is difficult to obtain accurate channel estimation values, resulting in the inability to perform very accurate frequency domain equalization so that good system performance cannot be obtained. The present invention eliminates the influence of Gaussian noise and obtains accurate channel estimation value through the method of zeroing the sliding pilot frequency and the small energy path.

[0037] First obtain the pilot block after passing through the channel, and use the least square frequency domain channel estimation (LS) ...

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Abstract

The invention belongs to the technical field of shortwave communication, and particularly relates to a channel estimation method for Single Carrier Frequency Domain Equalization (SC-FDE) under a shortwave communication channel. The channel estimation denosing method suitable for the single carrier frequency domain equalization under the shortwave communication channel based on the SC-FDE is provided. Due to the poor shortwave channel and the effect of Gaussian noise, the accurate channel estimation value is very difficult to obtain, the very accurate frequency domain equalization cannot be carried out, and very good system performance cannot be obtained. The frequency guide block data initial channel estimation value is obtained through a least squares (LS) algorithm or a linear minimum mean square error (LMMSE) algorithm, the noise on a main path is removed through a method of sliding a frequency guide block, the noise on a low-energy path is eliminated through a low-energy path zero setting method, and the accurate channel estimation value is obtained.

Description

technical field [0001] The invention belongs to the technical field of short-wave communication, and in particular relates to a channel estimation method for Single Carrier Frequency Domain Equalization (Single Carrier Frequency Domain Equalization, SC-FDE) in a short-wave communication channel. Background technique [0002] According to the division of CCIR (Consultative Committee of International Radio), short-wave refers to electromagnetic waves with a wavelength of 10m to 100m and a frequency of 3MHz to 30MHz. Radio communication using short waves is called short wave communication. Shortwave communication actually means that the frequency range used is 1.5MHz to 30MHz, and the frequency range that can be used is only 28.5MHz. According to international regulations, each shortwave station occupies a frequency width of 3.7kHz. Now the frequency width of shortwave stations has recently been increased to reach 6kHz ~ 9kHz, but the communication space is still very crowded,...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 何旭朱青云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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