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Method and device for channel estimation

A technology of channel estimation and sending and receiving devices, which is applied in the field of channel estimation, and can solve the problems of increasing time delay and resource complexity, reducing channel estimation efficiency, etc.

Active Publication Date: 2020-01-31
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above filtering process needs to switch back and forth between the time domain / frequency domain, and also needs to perform energy shift before and after the time domain filtering. From the perspective of hardware implementation, the time delay and resource complexity are both greatly increases and reduces the efficiency of channel estimation

Method used

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  • Method and device for channel estimation

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Experimental program
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Embodiment 1

[0072] An embodiment of the present invention provides a method for channel estimation, see figure 1 . The method includes:

[0073] 101: Perform initial channel estimation and gamma factor elimination processing on the data carrier in the received signal to obtain a channel estimation value of the data carrier;

[0074] 102: According to the channel estimation value of the data carrier, perform filling processing on the null carrier and the pilot carrier in the received signal to obtain the channel estimation value of the null carrier and the pilot carrier;

[0075] 103: Obtain the modulation mode of the received signal, and determine the tap coefficient of the filter according to the modulation mode;

[0076] 104: Perform frequency domain filtering on the channel estimation value of the data carrier and the channel estimation value of the empty carrier and the pilot carrier in the filter according to the determined tap coefficient; the time domain characteristics of the fi...

Embodiment 2

[0080] An embodiment of the present invention provides a method for channel estimation, see figure 2 . The method includes:

[0081] 201: Perform initial channel estimation and gamma factor elimination processing on the data carrier in the received signal to obtain a channel estimation value of the data carrier.

[0082] After receiving the received signal, the receiver transforms the received signal into a frequency domain signal through FFT. The operation of the LS algorithm is performed on each data carrier part in the frequency domain signal.

[0083] In addition, because the channel characteristic of Wifi is a slow-changing channel, in order to reduce the PAPR (English: Peak to Average Power Ratio, referred to as: peak-to-average power ratio) at the sending end, the gamma factor processing is added, and the slow-changing channel is changed into a sudden-changing channel. In the filtering process, the channel should be restored to a slow-changing channel first, so the ...

Embodiment 3

[0125] An embodiment of the present invention provides a device for channel estimation, see Figure 8 . The unit includes:

[0126] An initial estimation module 801, configured to perform initial channel estimation on the data carrier in the received signal;

[0127] The elimination processing module 802 is used to obtain the channel estimation value of the data carrier after performing gamma factor elimination processing;

[0128] The padding processing module 803 is used to perform padding processing on the null carrier and the pilot carrier in the received signal according to the channel estimation value of the data carrier to obtain the channel estimation value of the null carrier and the pilot carrier;

[0129] The first determining module 804 is configured to acquire the modulation mode of the received signal, and determine the tap coefficient of the filter according to the modulation mode;

[0130] The filtering module 805 is used to perform frequency-domain filterin...

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Abstract

Embodiments of the present invention relate to the technical field of communications. Provided are a channel estimation method and apparatus. The method comprises: obtaining a channel estimation value of a data carrier after conducting initial channel estimation on the data carrier in a received signal and conducting gamma factor elimination processing; obtaining channel estimation values of a null carrier and a pilot carrier after conducting filling processing on the null carrier and the pilot carrier in the received signal according to the channel estimation value of the data carrier; acquiring a modulation mode of the received signal, and determining a tap coefficient of a filter according to the modulation mode; conducting, in the filter, frequency-domain filtering on the channel estimation value of the data carrier and the channel estimation values of the null carrier and the pilot carrier according to the determined tap coefficient; and obtaining a final channel estimation value of the data carrier after conducting gamma factor addition processing on the filtered channel estimation value of the data carrier. In the present invention, frequency-domain filtering is conducted on the basis of an LS algorithm so as to decrease a channel error, thereby reducing the complexity of operations as well as the time delay, and improving the efficiency of channel estimation.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a channel estimation method and device. Background technique [0002] In the baseband processing of WiFi (English: Wireless-Fidelity, referred to as: Wireless Fidelity) chip, the quality of channel estimation will directly affect the product performance of the chip, so a channel estimation algorithm with simple implementation and excellent performance will greatly improve the performance of the product. competitiveness. Compared with the ideal channel estimation algorithm, there is a performance error of 3 dB between the existing LS (English: Least Square, abbreviation: least mean square) algorithm in the industry. In order to reduce the error, the general processing method is to filter the initial channel estimation value obtained by the LS algorithm to improve the accuracy of the channel estimation value. [0003] At present, the filtering processing method f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
CPCH04L25/02
Inventor 薛鑫颜敏董超科
Owner HUAWEI TECH CO LTD