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Frequency segmentation channel equalization method

A technology of channel equalization and frequency domain equalization, which is applied in the field of array signals, can solve problems such as difficult superposition and simultaneous realization, limited engineering application of frequency domain equalization, large storage space, etc., to improve processing performance, improve cancellation performance, reduce The effect of storage space

Active Publication Date: 2016-05-25
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

However, the methods mentioned in the above papers are all based on how to construct time-domain filter coefficients. This time-domain processing method needs to be realized through logic sequential units, and it is difficult to superimpose it on other processing processes (such as pulse pressure process) to realize simultaneously.
On the other hand, even if the frequency response of the equalization filter is known, direct application in pulse pressure processing requires a huge storage space, which limits the engineering application of frequency domain equalization

Method used

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Embodiment

[0065] In one embodiment of the present invention, the channel frequency domain equalization filter frequency characteristics e=[e[1],e[2],...,e[P]] T , P=256; f s =4MHz; the baseband complex signal x of the reference channel and the channel to be equalized M =[x M [1],x M [2],...,x M [L]] T , x A =[x A [1],x A [2],...,x A [L]] T L=1800; signal bandwidth BW=3MHz.

[0066] The equalization process is as follows:

[0067] 1. Take N=2048 to find the N-point frequency characteristics of the channel frequency domain equalization filter

[0068] e N O = FFT ( IFFT ( e , 2048 ) , 2048 )

[0069] 2. Find the filter coefficients of each segment of segment equalization, and reduce the actual coefficients used from 2048 points to 24 point...

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Abstract

The invention belongs to the array signal technology, and relates to a method of equalizing unmatched channels in a certain bandwidth. The channel equalization method comprises the following steps: 1, a frequency domain equalization filter is converted into an N-point filter, and N is selected to be the least power no smaller than L, and the N-point frequency feature e<N><O> of the frequency domain equalization filter is solved; 2, each section filter coefficient for segmented equalization is solved; and 3, the eN is used for carrying out equalization processing on a baseband complex signal xA of the to-be-equalized channel, and a complex signal sequence xAE after equalization is obtained. The storage space needed by channel equalization can be reduced, the cancellation performance between channels is improved, the array processing performance is thus enhanced, and requirements of multichannel array signal processing by a modern communication system, a phased array radar system and the like can be met.

Description

technical field [0001] The invention belongs to array signal technology and relates to an equalization method for channel mismatch within a certain bandwidth. Background technique [0002] Dual or multi-channel array signal processing is increasingly used in modern radar and modern communications. For example, in radar signal processing, traditional sidelobe cancellation technology (SLC) and adaptive beamforming technology (ADBF) use two or more channels to cancel interference from different angles with the target; space-time Adaptive Processing Technology (STAP) can use multiple channels to cancel various types of clutter coupled with space-time. However, differences in frequency characteristics between channels will result in a remainder of cancellation, resulting in a decrease in signal-to-interference-noise ratio (SINR) or signal-to-noise-to-noise ratio (SCNR). Channel equalization can correct the difference in frequency characteristics between channels and improve cha...

Claims

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Application Information

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IPC IPC(8): H04L25/03
Inventor 孙国梁张广磊董晔
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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