Method for inserting pilot frequency and estimating parameters of channel for equilibrium in frequency doman

A channel parameter and pilot insertion technology, applied in the direction of transmission control/equalization, electrical components, transmission system, etc., can solve problems such as complex implementation, inaccurate channel parameters, and large number of transversal filter taps

Active Publication Date: 2003-12-24
TSINGHUA UNIV +1
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Problems solved by technology

Before equalization, the crosstalk between the pilot code channel and the data code channel makes the channel parameters estimated according to the pilot signal inaccurate, and the time domain equalization based on the obtained channel parameters has a slow convergence speed and the number of taps of the transversal filter is too large. Many, too complex to implement

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  • Method for inserting pilot frequency and estimating parameters of channel for equilibrium in frequency doman
  • Method for inserting pilot frequency and estimating parameters of channel for equilibrium in frequency doman
  • Method for inserting pilot frequency and estimating parameters of channel for equilibrium in frequency doman

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Embodiment Construction

[0029] In the communication system, a plurality of mutually isolated and relatively independent sub-carriers are used, and the structure of each carrier is basically the same. The baseband digital signal processing of each sub-carrier adopts the method described in the present invention, that is, the data signal after encoding, modulation and mapping is complex with the pilot signal. Then, through orthogonal transformation and interleaving, the pilot information only appears on certain frequency points, while the data does not have these frequency components, and then add a cyclic prefix to each data block at the sending end, and remove it at the receiving end, thus eliminating The interference between data blocks and frequency domain signals caused by multipath delay expansion ensures that the received pilot information is not interfered by data signals in the frequency domain, and then the extracted frequency domain pilot information is used as Channel estimation and frequenc...

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Abstract

The method makes multiple connections of data signal and pilot signal at the sending end of the communication system after mapping the coded modulation. Also the method makes the pilot signal appear at some frequency points only, and the data have no such frequency components. The circle prefix is added into each data block at the sending end, and the circle prefix is removed at the receiving endin order to eliminate interference between data blocks or between signals in frequency domain caused by time delay expand in multiple routes. Then, the channel parameter estimation at the corresponding frequency point is obtained by using the picked pilot signal in frequency domain. Base on the estimation at the said point, the channel parameter estimations for all frequency points are obtained by using the interpolation method. The invention has the advantages of simple algorithm and high accuracy for channel parameter estimation.

Description

technical field [0001] A method for pilot insertion and channel parameter estimation for frequency domain equalization belongs to the technical field of wireless communication. Background technique [0002] An actual baseband transmission system cannot completely satisfy the ideal waveform transmission without distortion condition, so crosstalk is almost inevitable. When the crosstalk is seriously affected, the transfer function of the entire system must be corrected, that is, equalized, so that it is close to the distortion-free transmission condition. Equalization means that the equalizer at the receiving end produces characteristics opposite to the channel characteristics, which are used to offset the interference caused by the time-varying multipath propagation characteristics of the channel. It can be divided into two types: time domain equalization and frequency domain equalization. Before equalization, channel parameters need to be estimated, and pilot signals are us...

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Application Information

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IPC IPC(8): H04B1/76H04B7/005H04L25/02
Inventor 周世东赵明周春晖王京施婷婷任晓东张秀军
Owner TSINGHUA UNIV
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