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A channel estimation method in a high -speed mobile environment

A channel estimation and high-speed mobile technology, applied to baseband system components, multi-frequency code systems, etc., can solve the problems of reduced accuracy and achieve the effect of improving accuracy

Active Publication Date: 2016-03-16
CHINA RAILWAY SIGNAL & COMM
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  • Application Information

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Problems solved by technology

In the case of high-speed mobile terminals, the accuracy of the above traditional channel estimation methods is greatly reduced

Method used

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  • A channel estimation method in a high -speed mobile environment
  • A channel estimation method in a high -speed mobile environment
  • A channel estimation method in a high -speed mobile environment

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0027] LTE is a wireless communication protocol based on OFDM transmission system. In LTE downlink communication, the baseband block diagram of the process of data before OFDM modulation at the transmitter and after OFDM modulation at the receiver is as follows figure 1 shown.

[0028] The channel estimation method of the present invention is mainly carried out after the receiver performs OFDM demodulation on the data, and the flow chart of the method is as follows figure 2 shown.

[0029] When adopting 1.4MHz bandwidth to carry out downlink wireless communication according to t...

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Abstract

The invention discloses a channel estimation method under a high-speed mobile environment, which is based on an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system and pilot frequency. The method comprises the steps that (1), data demodulated by OFDM is mapped by a receiver to form a time-frequency two-dimensional data block to be stored in a matrix form; (2), channel state information corresponding to a pilot frequency point part in a data matrix is computed; and (3), channel state information corresponding to a data part is obtained by using the channel state information corresponding to the pilot frequency point part in the data matrix, and by time-frequency two-dimensional interpolation. With the adoption of the method, a time-frequency double selective channel caused by broadband wireless communication under the high-speed mobile environment can be confronted effectively, and the accuracy of channel estimation can be improved.

Description

technical field [0001] The invention relates to a channel estimation method for a receiver when a base station and a mobile terminal perform uplink and downlink communication in a high-speed mobile environment, and belongs to the technical field of wireless communication. Background technique [0002] In a wireless communication system, the transmission of the signal from the transmitter to the receiver will be affected by the actual channel environment and cause distortion. In order to effectively restore the original signal, the receiver needs to estimate the corresponding channel state information in the signal transmission as accurately as possible, and then use the estimated channel state information to perform further equalization processing on the received signal. Therefore, the accuracy of receiver channel estimation is crucial for the correct transmission of wireless communication information. [0003] In recent years, with the vigorous development of transportatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 侯金鑫张毅刚华尧李莉胡莉丽石杰王磊周宇晖朱琰熊箭归琳刘勃程鹏马文峰
Owner CHINA RAILWAY SIGNAL & COMM