A method for fast channel estimation by means of training sequence

A channel estimation and training sequence technology, which is applied in the field of fast channel estimation, can solve problems such as channel estimation errors and demodulation performance deterioration, and achieve the effect of improving receiving performance and reducing computational complexity

Inactive Publication Date: 2006-01-18
ZTE CORP
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for quickly performing channel estimation using training sequences, and to solve the channel estimation error in the prior art because the maximum delay extension of the user's real multipath channel exceeds a given window length And the problem of sharp deterioration of demodulation performance

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  • A method for fast channel estimation by means of training sequence
  • A method for fast channel estimation by means of training sequence
  • A method for fast channel estimation by means of training sequence

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Embodiment Construction

[0020] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Assuming that the channel impulse response vector of different users (window length is W) is h (K×W-dimensional column vector, K is the maximum number of active users configured by the base station), a transmission matrix composed of training sequences or user data of different users Defined as G (as (L m +W-1)×KW matrix, in TD-SCDMA system, L m =144). According to the transmission theory, it can be known that the training sequence received data obtained from the measurement e=G·h+n (n is the noise matrix). The basic idea of ​​the present invention is to intercept any P (in the TD-SCDMA system, P=128) row data in the transmission matrix G to form a new matrix G′, and use the corresponding user training sequence for the 0 elements in the matrix G′ Instead, the criterion for replacement is to make the new matrix after replacement ...

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Abstract

This invention discloses a method for rapidly estimating communication channel with train sequence, which comprises the followings: a) making sure the widow length of the communication channel widow according to the base station; separating the train sequence receiving signal from the baseband receiving signal, and forming transmitting matrix according to all train sequence; b) cutting data from said receiving signal to form new data sequence, and cutting data from said transmitting matrix to form new matrix; c) deciding whether the widow length is larger than 16 cord sheet, substituting the element whose value is zero with the train sequence value of the corresponding user, making them meeting right circularity; c) operating Fourier transformation and inverse transformation, computing and separating the communication channel estimated value of each user. Said invention can be used when the widow length is larger or smaller than 16 cord sheet.

Description

Technical field [0001] The present invention relates to the field of digital mobile communications, in particular to a method for channel estimation using training sequences in a time TD-CDMA system, and more particularly to a fast channel when the channel window length allocated by users in a time division synchronous code division multiple access system is greater than 16 chips Estimate method. Background technique [0002] In the existing TD-CDMA (Time Division-Code Division Multiple Access) system and TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, the training sequence of all users in the same cell passes through a basic, periodic The training sequence (period P) is generated by a cyclic shift, and the corresponding channel estimation method generally uses the Steiner estimation method [Document 1], which is a low-cost channel estimation method. However, the performance of the Steiner estimator is affected by the additive noise at the receiving end...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04J13/02H04L25/02H04L27/26
Inventor 曾召华郭俊锋殷义军
Owner ZTE CORP
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