A chancel estimation method and device

Abstract

The utility model discloses a channel evaluation method and a device used for solving the problems in prior art of too complicated channel evaluation, big channel evaluation value error and the incapability of acquiring the maximum time delay and the root mean square time delay; and that the channel evaluation method only halts in the theory field and can not be applied in practice. The utility model comprises the steps: the channel evaluation value in the frequency domain is acquired through the pilot signal and the pilot symbol; the channel evaluation value in the frequency domain is transformed to the channel evaluation value in the time domain through the inverse Fourier transform; the noise threshold is settled based on the channel evaluation value in the time domain and the corresponding time delay value of the noise threshold is considered as the maximum time delay based on the negative exponential distribution characteristic of the multi-path power spectrum; the root mean square time delay is acquired based on the negative exponential distribution characteristic of the multi-path power spectrum and the noise threshold and the maximum time delay; and the channel evaluation value of the pilot sequence is acquired based on the maximum time delay and the root mean square time delay. The utility model can be used for evaluating the channel of the pilot frequency sequence.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a channel estimation method and device. Background technique [0002] In a new generation wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) multi-carrier technology, channel estimation affects the performance of the entire system. Due to the high transmission rate, it is necessary to use coherent detection technology to obtain high channel estimation performance. Non-blind channel estimation based on auxiliary pilots can better track changes in wireless channels and improve receiver performance. [0003] Least square (LS, least square) channel estimation is the simplest channel estimation method. It only needs to know the transmitted pilot signal X P and the received pilot symbols Y P That's it. The LS channel estimator obtains the channel characteristics of the pilot position ac...

AI Technical Summary

Problems solved by technology

[0030] The present invention provides a channel estimation method and its corresponding channel estimation device, which are used to solve the problem that the channel estimation in the prior art is greatly affected by noise, the estimation accuracy and performance are not high, and only the theoretical optimal estimation value can be obtained. , which is difficult to obtain practical application

Images