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

A channel parameter and pilot insertion technology, applied in transmission control/equalization, electrical components, transmission systems, etc., can solve the problems of large number of taps, complex implementation, and slow convergence speed of transversal filters

Inactive Publication Date: 2005-05-04
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 of equilibrium in frequency doman
  • Method for inserting pilot frequency and estimating parameters of channel of equilibrium in frequency doman
  • Method for inserting pilot frequency and estimating parameters of channel of equilibrium in frequency doman

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Embodiment Construction

[0033] 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, and the baseband digital signal processing of each sub-carrier adopts the method described in the present invention, that is, each data signal sequence after encoding, modulation and mapping and the guide The frequency signal sequence is multiplexed to form a data block. Through orthogonal transformation and interleaving, the pilot information only appears on certain frequency points, while the data does not have these frequency components. Then add a cyclic prefix to each data block at the sending end, and receive The end removes it, thereby eliminating the interference between data blocks and frequency domain signals caused by multipath delay expansion, ensuring that the received pilot information is not interfered by data signals in the frequency domain, and then using the extraction The obtained frequ...

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Abstract

The method for pilot insertion and channel parameter estimation for frequency domain equalization belongs to the technical field of wireless communication, and is characterized in that: at the transmitting end of the wireless communication system, each data signal sequence after encoding, modulation and mapping is multiplexed with the pilot signal sequence Form a data block, through orthogonal transformation and interleaving, so that the pilot information only appears at 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; at the receiving end, Then remove the cyclic prefix to eliminate the interference between data blocks and frequency domain signals caused by multipath delay expansion, and then use the extracted frequency domain pilot information to estimate channel parameters at the corresponding frequency point, and then according to This interpolation method is used for channel parameter estimation at all frequency points. It is not only simple in algorithm and implementation but also high in accuracy of channel 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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Patent Type & Authority Patents(China)
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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