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Channel equalization method based on bidirectional noise prediction decision feedback

A technology of channel equalization and decision feedback, which is applied in baseband system parts, shaping network in transmitter/receiver, etc., can solve problems such as reducing the complexity of equalization, and achieve practicality, low complexity, and good performance Effect

Inactive Publication Date: 2014-09-03
XIDIAN UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to address the disadvantages of high complexity in the prior art, and propose a two-way noise-based predictive decision feedback equalization method, without loss of performance, to reduce the equalization complexity and expand the application

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  • Channel equalization method based on bidirectional noise prediction decision feedback
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Embodiment Construction

[0030] The technical method of the present invention will be further described below through the accompanying drawings and examples.

[0031] refer to figure 1 , the implementation steps of the present invention are as follows:

[0032] Step 1: perform serial-to-parallel conversion on the input serial data y(n).

[0033] Transform the first input data into output data y(0), transform the second input data into output data y(1), ..., transform the input Nth data into output data y(N-1 ), to obtain N-way parallel data y=[y(0), y(1),..., y(N-1)] T .

[0034] Step 2: Perform FFT transformation on the N parallel data y obtained in Step 1.

[0035] Perform FFT transformation on the input parallel data y to obtain the parallel data form after FFT transformation:

[0036] Y=Fy,

[0037] Among them, y is the input parallel data represented by a column vector, and Y represents the frequency domain signal obtained after FFT transformation Y=[Y(0), Y(1),...,Y(N-1)] T , F is the unn...

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Abstract

The invention discloses a channel equalization method based on bidirectional noise prediction decision feedback and mainly aims to solve a problem of high complexity of a traditional bidirectional noise prediction decision feedback algorithm. The method comprises steps that: 1, FFT conversion for a time domain signal is carried out to acquire a frequency domain signal; 2, feedforward filtering for the frequency domain signal is carried out; 3, IFFT conversion for the data after a feedforward filter is carried out to acquire a time domain signal; 4, signal overturning for the time domain signal is carried out; 5, positive noise prediction filtering for the signal before overturning is carried out; 6, reverse noise prediction filtering for the data after overturning is carried out; 7, the data acquired after positive noise prediction filtering and the data after reverse noise prediction filtering are combined to acquire a signal to be determined; and 8, the signal to be determined is determined to acquire a channel equalization result. According to the channel equalization method, only one feedforward filter is used, channel equalization complexity is reduced, the channel equalization method has stronger practicality and is suitable for a time varying channel having obvious multipath effects.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a single-carrier channel frequency domain equalization method, which is suitable for time-varying multipath channels. Background technique [0002] In a wireless communication system, radio waves are affected by channel multipath during wireless channel transmission, and multipath fading will occur. When the channel coherent bandwidth caused by multipath delay expansion is greater than the signal bandwidth, the signal will undergo frequency selective fading. . In order to compensate the frequency-selective fading caused by the channel to the signal, the technology of using the channel estimation value to compensate the received signal in the frequency domain so that the signal transmission meets the requirement of no intersymbol interference is called channel frequency domain equalization (FDE). Channel equalization techniques include linear and nonlinear equalization. [00...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 宫丰奎任文龙张南王辉
Owner XIDIAN UNIV
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