Channel estimation method and device and pilot frequency sequence generation method and device

Abstract

The invention discloses a channel evaluating device and method. A pilot frequency data is preset and then modulated. The modulated signal is subjected to space-time block coding to generate orthogonal pilot frequency sequences and the said orthogonal pilot frequency sequences are respectively sent to the transmitting terminal. The transmitting terminal respectively processes the input orthogonal pilot frequency sequences by fast Fourier transform and then sends the sequences to the receiving end. The receiving end processes the received orthogonal pilot frequency sequences by fast Fourier transform to obtain the receiving signal. The associated matrices of the orthogonal pilot frequency sequences is calculated and the associated matrices is multiplied with the receiving signal and the result is divided by power of signal sampling value and interval number to obtain the estimated value of channel. The invention can ensure the channel evaluation precision and at the same time fully show the correlated characteristic of the multi-path wireless channel, in addition the invention also uses time-domain filtering method to filter part of noise therefore the channel evaluation performance is improved, synchronously the invention can also reduce the complexity of the channel evaluating operation.

Description

technical field [0001] The present invention relates to a multiple-input multiple-output orthogonal frequency division multiplexing system, in particular to a channel estimation method and device for a multiple-input multiple-output ultra-wideband system and a method and device for generating pilot sequences. Background technique [0002] The pilot-based channel estimation can be divided into two ways: pre-pilot channel estimation and comb-shaped pilot channel estimation according to the pilot insertion position. The former is suitable for slow fading channels, while the latter is suitable for time-varying channels. Usually, multi-antenna ultra-wideband systems choose the preamble channel estimation method, because the environment of multi-antenna ultra-wideband systems is mainly indoors, and the channel can be regarded as quasi-static or slow fading channels, and because the multi-antenna ultra-wideband channel The frequency-selective fading of is very serious, which will c...

AI Technical Summary

Problems solved by technology

[0005] Since the first kind of pre-pilot channel estimation is to estimate the channel frequency domain response of the position by interpolation at the position without pilot data, this reduces the accuracy of channel estimation

Although the second preamble channel estimation method does not need to use interpolation to calculate the channel response frequency, and can only transmit with a single antenna and receive with a single antenna at the same time, it has high accuracy, but it cannot make full use of MIMO at the same time Correlation Characteristics in System Radio Channel

Therefore, the defect of the prior art is that the accuracy of the channel estimation is not high, or when the accuracy of the pilot channel estimation is high, the superior characteristics of multiple antennas in the MIMO system are not fully utilized

Images