OFDM (orthogonal frequency division multiplexing) channel estimation method based on symmetrical basis expansion model for quick time-varying channel
A base extension model and time-varying channel technology, applied in the field of digital mobile communication and wireless communication of practical electromagnetic wave technology, can solve the problems of reducing computational complexity, not having robust characteristics, and large error at the edge of the channel, so as to improve continuity , Improve the effect of fitting channel accuracy
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[0039] The BEM channel estimation takes advantage of the narrow-band characteristics of the time-varying channel and transforms the time-varying channel into a weighted linear superposition of a few orthogonal components. The weight is also the BEM basis coefficient. Since this modeling is performed in units of one OFDM symbol period, these basis coefficients will remain unchanged during the OFDM symbol period. This conversion reduces the large number of channel parameters that originally needed to be estimated to a small number of BEM basis coefficients. Therefore, with a small number of pilot symbols or training sequences, the estimation of the time-varying channel can be completed, and it is less affected by the speed of channel fading.
[0040] The present invention will be further described in detail below in conjunction with the drawings.
[0041] Such as figure 1 It is a fast time-varying channel channel estimation based on the symmetric base spreading model. The specifi...
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