Channel estimation method and device based on Doppler frequency shift

A technology of Doppler frequency shift and channel estimation, which is applied in baseband system parts, shaping network in transmitter/receiver, etc., can solve the problem that the channel estimation algorithm cannot meet the system requirements, achieve good performance and reduce system cost. The effect of bit error rate

Active Publication Date: 2011-10-19
江苏溢泽给排水设备有限公司
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Problems solved by technology

[0024] The present invention provides a channel estimation method and device based on Doppler frequency shift, which is used to solve the problem in the prior a

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  • Channel estimation method and device based on Doppler frequency shift
  • Channel estimation method and device based on Doppler frequency shift
  • Channel estimation method and device based on Doppler frequency shift

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Embodiment 1

[0102] like image 3 As shown, the embodiment of the present invention provides a channel estimation method based on Doppler frequency shift. This embodiment takes the LTE system proposed by 3GPP as an example. In the LTE system, the uplink is a block pilot, and the placed symbol is the fourth symbols and the 11th symbol, such as Figure 4 shown; and, in the received frame signal, the subcarriers corresponding to each symbol are regarded as particles. The method described in this embodiment specifically includes:

[0103] Step S301: Receive the data of a subframe, for the subcarrier X of the pilot symbol position in the frame data p Perform LS estimation to obtain its frequency domain channel response value.

[0104] This step is specifically: first set the subcarrier X of the pilot position p The information is extracted and put into the pilot buffer, and the initial LS estimation is performed on the subcarrier where the pilot position of the received symbol is located ac...

Embodiment 2

[0132] like Figure 5As shown, the embodiment of the present invention provides a channel estimation method based on Doppler frequency shift. This embodiment takes the LTE system proposed by 3GPP as an example. In the LTE system, the downlink is a comb pilot, and the placed symbol is the first symbol, the 5th symbol, the 8th symbol and the 12th symbol, such as Image 6 shown; and, in the received frame signal, the subcarriers corresponding to each symbol are regarded as particles. The method described in this embodiment specifically includes:

[0133] Step S501: Receive the data of a subframe, for the subcarrier X of the pilot symbol position in the frame data p Perform LS estimation to obtain its frequency domain channel response value.

[0134] Step S502: Perform FFT noise reduction filtering on the frequency domain channel response value of the pilot symbol position, so as to filter out the influence of noise on it to a certain extent.

[0135] Step S503: After obtainin...

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Abstract

The invention discloses a channel estimation method and a device based on Doppler frequency shift. The method comprises the following steps: receiving a frame signal, and carrying out channel response estimation to subcarriers at pilot frequency symbol positions in the frame signal to obtain channel response values of the subcarriers of the pilot frequency symbol positions; computing relative velocity V of a terminal relative to a base station during receiving pilot frequency symbols; based on the velocity V, computing the shift quantity of channel response values, caused by the Doppler frequency shift; and utilizing the channel response values of the subcarriers of the pilot frequency symbol positions and the shift quantity of the channel response valves to estimate so as to obtain the channel response values of the subcarriers of data symbol positions between adjacent pilot frequency symbols. By the method disclosed by the invention, the requirement of a user on the accuracy of the system channel estimation under the condition of high-velocity moving can be met, the system error rate is reduced, and the good property of a system can be ensured.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a channel estimation method and device based on Doppler frequency shift. Background technique [0002] In order to meet people's increasingly higher requirements for mobile communications in the future, get rid of the constraints of venues and environments, and realize ubiquity in a true sense, the communication system provides users with high-speed data services and can support users in various wireless communication systems. The new network of seamless roaming has become the development trend of today's mobile communications. [0003] Since the unreliability of wireless communication is mainly caused by the time-varying and multipath propagation of wireless fading channels, how to effectively combat these transmission defects of wireless channels is a necessary condition for realizing high-speed wireless communication in the future. At present, in wireless commun...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 赵彦王建郭定一李光远
Owner 江苏溢泽给排水设备有限公司
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