Wavelet-denoising-based SC-FDE channel estimation method in short wave channel

A technology of SC-FDE and channel estimation, which is applied in baseband system components, multi-frequency code systems, etc., and can solve the problems of large noise impact and low estimation accuracy.

Active Publication Date: 2015-04-01
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] For above deficiencies in the prior art, the object of the present invention is to provide a kind of SC-FDE channel estimation method based on wavelet denoising that solves that the existing LS channel estimation algorithm

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  • Wavelet-denoising-based SC-FDE channel estimation method in short wave channel
  • Wavelet-denoising-based SC-FDE channel estimation method in short wave channel

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Embodiment Construction

[0038] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the present invention. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0039] figure 1 It is the baseband system model of SC-FDE. At the sending end, the input data is modulated, serial-to-parallel converted, and pilots and CPs are inserted to form M data blocks of length N, which are then sent to the channel after parallel-to-serial conversion. At the receiving end, perform serial-to-parallel conversion first, perform DFT transformation after removing CP, use the information at the pilot position for channel estimation, perform frequency domain equalization according to the estimated channel characteris...

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Abstract

The invention discloses a wavelet-denoising-based SC-FDE channel estimation method in a short wave channel. The wavelet-denoising-based SC-FDE channel estimation method includes the steps of firstly, partitioning sent data, periodically inserting pilot frequency between data blocks, extracting information at the pilot frequency positions at a receiving end, and estimating channel frequency responses at the pilot frequency with an LS algorithm; secondly, carrying out IDFT on obtained estimation values to be in a time domain, factoring the estimation values in a wavelet domain according to a multi-Mallat algorithm, filtering out noise with a threshold denoising method, and reconstructing noise-eliminated signals; finally, carrying out interpolation zero filling on the reconstructed signals, carrying out DFT on the reconstructed signals to be in a frequency domain, accordingly obtaining all the channel frequency responses, and completing channel estimation. According to the wavelet-denoising-based SC-FDE channel estimation method in the short wave channel, the LS estimation left noise is eliminated with a wavelet denoising method, influences of the noise are further suppressed accordingly, the system bit error rate is lowered, and the system performance is improved.

Description

technical field [0001] The invention relates to the field of short-wave communication, in particular to an SC-FDE channel estimation method based on wavelet denoising under a short-wave channel. Background technique [0002] Short-wave communication relies on 1.5-30MHz electromagnetic waves for signal transmission. It is the earliest and widely used wireless communication method, and it is still an important means of medium and long-distance wireless communication. Short-wave communication relies on ionospheric reflection for communication. The channel conditions are harsh and channel characteristics change rapidly with time. At the same time, the short-wave channel is a multipath fading channel, and its multipath delay can reach 5ms. Multipath interference will cause intersymbol interference and frequency selective fading during data transmission, resulting in fluctuations in received signals and seriously affecting communication quality. Therefore, anti-multipath fading a...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 唐宏薛真真郭彦芳孟婷婷周小宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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