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Sparse OFDM channel estimation method based on generalized orthogonal matching tracking algorithm

A technology of orthogonal matching pursuit and channel estimation, applied in baseband systems, baseband system components, digital transmission systems, etc., can solve the problem of low recovery accuracy

Active Publication Date: 2018-07-24
HANGZHOU DIANZI UNIV
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Problems solved by technology

Although the reconstruction speed of the signal using the greedy pursuit algorithm is very fast, the recovery accuracy is very low

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  • Sparse OFDM channel estimation method based on generalized orthogonal matching tracking algorithm
  • Sparse OFDM channel estimation method based on generalized orthogonal matching tracking algorithm
  • Sparse OFDM channel estimation method based on generalized orthogonal matching tracking algorithm

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Embodiment Construction

[0105] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0106] The sparse channel estimation method based on the generalized orthogonal matching pursuit algorithm in compressed sensing provided by the present invention can be used in the field of information and communication engineering technology, and is not limited to the communication field described in detail below. The following typical fields are selected to illustrate the specific implementation manners of the present invention.

[0107] The generalized orthogonal matching pursuit algorithm in the compressed sensing of this embodiment is realized through the following main steps in sequence:

[0108] 1) Transform the channel estimation problem into the problem of reconstructing the original signal based on compressed sensing theory. The multipath channel is equivalent to a time-varying finite impulse response filter, and the estimation of the...

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Abstract

The invention discloses a sparse OFDM channel estimation method based on a generalized orthogonal matching tracking algorithm. The method comprises the following steps: step one, translating a channelestimation problem into a problem for reconstructing original signal based on the compressed sensing theory; step two, designing a measurement matrix; and step three, reconstructing the original signal by using the generalized orthogonal matching tracking method so as to finish the channel estimation. The sparse OFDM channel estimation method based on the generalized orthogonal matching trackingalgorithm in the compressed sensing disclosed by the invention comprises the steps of translating the channel estimation problem into the problem for reconstructing original signal based on the compressed sensing theory, designing the measurement matrix and reconstructing the original signal by using the generalized orthogonal matching tracking algorithm. The operation complexity, namely the running time, are greatly reduced, the impulse response of the channel is precisely estimated, the system performance of the OFDM sparse channel estimation is improved so as to improve the signal demodulation quality, and the method has high application value.

Description

technical field [0001] The invention belongs to the technical field of information and communication engineering, and relates to a method for realizing sparse channel estimation by using a generalized orthogonal matching pursuit algorithm in sparse OFDM channel estimation and signal processing. Background technique [0002] In wireless communication systems, channel estimation is an extremely important research direction. The quality of its signal estimation will affect the performance of coherent demodulation. Compared with traditional Nyquist sampling, compressed sensing theory abandons complex coding algorithms, and simultaneously collects and compresses data. Its sampling rate is lower and the reconstructed signal is more accurate. Since most wireless multipath channels have sparse characteristics, and channel estimation is also a signal reconstruction problem to a large extent, it is natural to apply Compressive Sensing (CS) theory to transform the channel estimation p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0212H04L25/0224H04L25/0242H04L27/2695
Inventor 包建荣钱方姜斌刘超
Owner HANGZHOU DIANZI UNIV
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