Channel evaluation and evaluating device for orthogonal frequency division duplex telecommunication system

A technology for channel estimation and multiplexing communication, applied in the field of channel estimation, can solve problems such as difficult application and complexity, and achieve the effects of easy implementation, small amount of calculation, and improved accuracy

Inactive Publication Date: 2006-05-31
ZTE CORP
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Problems solved by technology

Due to the complexity of the meth...

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  • Channel evaluation and evaluating device for orthogonal frequency division duplex telecommunication system
  • Channel evaluation and evaluating device for orthogonal frequency division duplex telecommunication system
  • Channel evaluation and evaluating device for orthogonal frequency division duplex telecommunication system

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Embodiment Construction

[0035] figure 1 It is a structural schematic diagram of a receiver including the channel estimator of the present invention. The front-end processing module 101 receives radio frequency signals through the receiving antenna, and then performs processing such as down-conversion, analog-to-digital conversion, and cyclic prefix removal on the received signals. Finally, the data is output to FFT module 102 . The FFT module 102 performs fast Fourier transform on the input data, so that the data is transformed from the time domain to the frequency domain. The FFT module 102 outputs the data from the data carrier to the channel compensation module 104 and the data from the pilot carrier to the channel estimation module 103 . The channel compensation module 104 receives the user data output by the FFT module 102 and the data carrier channel estimation output by the channel estimation module 103, and uses the data carrier channel estimation to perform amplitude and phase compensation...

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Abstract

The method includes following steps: system receiver makes Fourier transform for time domain pilot frequency signal to get frequency domain pilot frequency signals; makes LS estimation to get channel estimation of pilot frequency carrier; the time frequency filter is made for channel estimation of pilot frequency carrier to get new channel estimation result of pilot frequency carrier; the interpolation is made for the acquired pilot frequency channel estimation result to get channel estimation of data carrier. The invention also provides a relating device. The invention not only considers correlation of channel on frequency domain, but also considers correlation of channel on time domain so that the accuracy of channel estimation is remarkably improved.

Description

technical field [0001] The present invention relates to channel estimation in a wireless mobile communication system, in particular to channel estimation in an Orthogonal Frequency Division Multiplexing communication system. Background technique [0002] As a multi-carrier transmission mode, Orthogonal Frequency Division Multiplexing (OFDM) makes the system more sensitive to multipath fading channel frequency selectivity by converting a high-speed transmission data stream into a set of low-speed parallel transmission data streams. The introduction of the cyclic prefix further enhances the ability of the system to resist inter-symbol interference (ISI). In addition, the high bandwidth utilization rate and simple implementation make OFDM more and more widely used in the wireless communication field, and channel estimation, as a key technology of OFDM system, has also become a research hotspot in the field of communication, and has received more and more attention. focus on. ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 夏树强吕永霞林佳仕
Owner ZTE CORP
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