OFDM pilot scheme design and channel estimation method

A technology of channel estimation and pilot position, applied in multi-frequency code systems, baseband system components, etc., can solve the problems of large storage capacity of sampling matrix, complex calculation of compression and reconstruction, etc.

Active Publication Date: 2012-03-21
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] The main purpose of the present invention is to provide an OFDM pilot scheme design and channel estimation method to solve the problem that the existing channel estimation method based on the princi

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  • OFDM pilot scheme design and channel estimation method
  • OFDM pilot scheme design and channel estimation method

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Embodiment Construction

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] According to an embodiment of the present invention, a channel estimation method for an OFDM system is provided.

[0027] figure 1 It is a flow chart of the channel estimation method of the OFDM system of the embodiment of the present invention, such as figure 1 As shown, the method includes:

[0028] Step S102, uniformly inserting pilot signals on the data frame of the OFDM system to obtain a pilot pattern;

[0029] Step S104, calculate the channel frequency response at the pilot position according to the pilot pattern, and obtain the sampling sequence of the channel frequency response information;

[0030] In step S106 , the channel estimation is performed by performing a modified orthogonal matching tracking according to the ...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) pilot scheme design and channel estimation method. The method comprises the following steps: pilot symbols are uniformly inserted into data frames of an OFDM system to obtain a pilot pattern, the frequency response of the channel at the pilot position is calculated according to the pilot pattern to obtain the sampling sequence of the channel frequency response information, and modified orthogonal matching tracking channel estimation is carried out according to the sampling sequence of the channel frequency response information and part of discrete Fourier matrices. By adopting the method provided by the invention, the channel estimation algorithm complexity is greatly reduced while the pilot density is greatly lowered, the channel estimation accuracy is improved, and accordingly, the efficient, low-complexity and accurate channel estimation is realized.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an OFDM pilot scheme design and channel estimation method. Background technique [0002] The performance of a wireless communication system is limited by the quality of the wireless channel. The wireless propagation path between the transmitter and receiver is very complex, ranging from simple line-of-sight propagation to propagation affected by various complex landforms, such as buildings, mountains, and forests. In addition, wireless channels are not as fixed and predictable as wired channels, but have great randomness, resulting in random distortion of the amplitude, phase and frequency of the received signal, which is difficult to quantitatively analyze. These issues pose challenges to the design of the receiver, of which the channel estimator is a key component. [0003] Channel estimation refers to estimating the state information of the channel to make it as close a...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 彭岳星李广威张晓峰赵慧郑侃
Owner BEIJING UNIV OF POSTS & TELECOMM
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