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OFDM channel estimation method and device

A channel estimation and Gaussian channel technology, applied in the field of OFDM channel estimation, can solve problems such as insufficient performance and insufficient channel estimation performance, and achieve the effects of improving performance, reducing complexity, and achieving good performance.

Active Publication Date: 2019-05-14
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0006] The existing channel estimation is a kind of linear estimator, the linear estimator is only a subset of all estimators, the performance of channel estimation is not good enough; in addition, the existing channel estimation and equalization are two separate processes, the performance is not good enough

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  • OFDM channel estimation method and device
  • OFDM channel estimation method and device

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Embodiment Construction

[0033] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] The embodiment of the present invention provides an OFDM channel estimation method, such as figure 2 As shown, the method includes:

[0035] S21. Using the actual channel coefficients generated by simulation, the initial channel estimation of the pilot sequence that the receiver can observe after passing through the fading ...

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Abstract

The invention provides an OFDM channel estimation method and device. The method comprises: using an actual channel coefficient generated by simulation, an initial channel estimation of a pilot sequence that can be observed by a receiver after a fading channel and a Gaussian channel, forming a training set, and using a backward error propagation algorithm to off-line neural network training under different noise variances to determine neural network coefficients corresponding to different noise variances; using neural networks that are completely consistent with the offline neural network training, selecting neural network coefficients corresponding to current actual noise variances, and evulating online channels on OFDM symbols .According to the invention, the performance of channel estimation and the overall performance of channel estimation and equalization can be improved.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to an OFDM channel estimation method and device. Background technique [0002] In OFDM (Orthogonal Frequency Division Multiplexing) wireless communication systems, the baseband signal model can be expressed as Y=HX+N, where Y represents the received signal, X represents the transmitted signal, H represents the channel coefficient, and N It is the thermal noise introduced by the receiver front end. In order to "recover" the transmitted signal X from the received signal Y, the current method is divided into two steps: [0003] The first step is to know the information of the channel coefficient H. In general communication systems (such as LTE, WiMAX), the pilot is inserted in the time-frequency plane ( figure 1 The black dots in) can be used to estimate H. This estimation process is called channel estimation. The current implementation methods of channel estimat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 巫戈明
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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