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Channel estimation method and device

A channel estimation and sequence technology, applied in the field of communication, can solve problems affecting receiver performance, channel estimation deviation, etc., and achieve the effect of improving the accuracy of channel estimation, reducing the probability of occurrence, and reducing errors

Active Publication Date: 2018-07-06
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

However, due to the influence of frequency offset, if the correlation calculation still uses the original local pilot sequence, it will cause a large deviation in channel estimation and affect the performance of the receiver.

Method used

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  • Channel estimation method and device

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Embodiment Construction

[0042] Embodiments of the present application provide a channel estimation method and device, which are used to improve channel estimation accuracy, thereby improving receiver performance.

[0043] Channel estimation is an indispensable module in the uplink coherent receiver. The purpose is to estimate the channel information experienced by the signal, so that the equalization module can overcome the unideal factors of the channel and restore the original transmitted signal. Discrete Fourier Transform (DFT), time domain windowing noise suppression algorithm, is a very commonly used channel estimation algorithm, it needs to calculate the transmitted pilot sequence locally, and use the received frequency domain The pilot signal is correlated with the local sequence, and then transformed into the time domain through IDFT. According to the channel delay expansion and the amplitude of each path, the effective path is selected to eliminate the influence of noise and interference.

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Abstract

The invention discloses a channel estimation method and device, which are used for improving channel estimation accuracy and further improving the performance of a receiver. The channel estimation method comprises the steps of determining an equivalent pilot frequency sequence through a historical effective frequency offset value; utilizing the equivalent pilot frequency sequence to determine a sequence for re-correlation; and utilizing the sequence for re-correlation to carry out a complex correlation calculation for channel estimation.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a channel estimation method and device. Background technique [0002] In the current Long Term Evolution (LTE) system, in the scenario where the terminal moves at high speed, the uplink signal generates a relatively large frequency deviation at the base station. Uplink pilot signals are all mapped sequences in the frequency domain, and a large frequency offset will lead to sampling deviation in the frequency domain, thereby generating inter-subcarrier interference. At the receiving end, due to the interference between subcarriers, the channel estimation will have a large deviation. [0003] The current channel estimation algorithm in the base station does not perform targeted processing for high-speed scenarios. A commonly used channel estimation algorithm uses a time-domain windowing noise suppression algorithm, that is, at the receiving end, the uplink ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/0202H04L25/0228H04L25/022H04L25/024H04L25/0224H04L25/03012H04W56/0045
Inventor 陈跃潭王希胡全飞
Owner DATANG MOBILE COMM EQUIP CO LTD
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