OFDM pilot scheme design and channel estimation method

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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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 principle of compressed sensing has a large storage capacity of the sampling matrix and complicated compression and reconstruction calculations caused by the use of random pilots. and other issues, among which:

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