Estimation method for low-complexity channel in time division duplex (TDD) multi-base station cooperative system

A cooperative system and channel estimation technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problems of high complexity, and achieve the effect of easy implementation, low computational complexity, and suppression of user self-interference

Inactive Publication Date: 2013-01-23
BEIHANG UNIV +1
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Problems solved by technology

However, the joint estimator needs to calculate the inverse of the high-dimensional matrix, so the complexity is very high. In addition, the joint estimator also needs the prior statistical information of the channel, which is difficult to achieve in the actual system.

Method used

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  • Estimation method for low-complexity channel in time division duplex (TDD) multi-base station cooperative system
  • Estimation method for low-complexity channel in time division duplex (TDD) multi-base station cooperative system
  • Estimation method for low-complexity channel in time division duplex (TDD) multi-base station cooperative system

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Embodiment

[0103] Step 1: Perform least squares processing on the diagonal matrix S formed by the base sequence of the pilot sequence sent by the user and the frequency domain signal y received by each antenna of the base station to obtain the processed frequency domain signal y′.

[0104] Assume that one contains N BS = 2 cooperative base stations and K = 8 coordinated multi-point transmission systems of served users, assuming that each base station has N t = 4 antennas, each user has one antenna, the total number of subcarriers in the system is N = 1024, and the number of subcarriers used is N u =600, the number of empty subcarriers is N v =424, the insertion interval of the pilot in the used subcarrier is I=2, and the number of pilots is N p =300. Since the processing method of the received signal on each antenna of each base station in the system is the same, the index of base station and antenna is omitted, and a 300×1-dimensional vector y is used to represent the frequency domai...

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Abstract

The invention discloses an estimation method for low-complexity channel in a time division duplex (TDD) multi-base station cooperative system, belonging to the field of wireless communication technology. The estimation method comprises the steps of: acquiring a frequency domain signal and a primary time domain signal vector, setting a primary iteration counting variable m to be equal to 0, acquiring a primary time domain channel vector, acquiring a time domain signal vector vm+1 after being subjected to m+1 iterations, acquiring the time domain channel vector after being subjected to m+1 iterations, updating a circulating counting variable m, and if m is greater than P, continuously acquiring a time domain signal vector, otherwise, obtaining frequency domain channels of K users. According to a channel estimation algorithm provided by the invention, matrix inversion in a minimum mean square error algorithm is converted to matrix power series by utilizing a series expansion manner, multiplication of matrix and vector can be realized by means of fast fourier transform and inverse fast fourier transform, the estimation method has the advantages of low complexity and excellent property, and can be realized without small-scale statistics information of the channel.

Description

technical field [0001] The invention relates to a channel estimation method in a time-division duplex multi-base station cooperative system, and belongs to the technical field of wireless communication. Background technique [0002] Making multiple base stations cooperatively transmit or receive is one of the emerging technologies to effectively solve the problem of inter-cell interference in the same-frequency cellular system. The basic idea is to make several base stations with strong mutual interference form a cooperative cluster, so that the base stations in the cooperative cluster can reduce or even eliminate the interference between cells in the cluster through information sharing and transmission cooperation. In 2008, 3GPP introduced this concept (CoMP) into its LTE-A (Long Term Evolution-Advanced) research framework. [0003] According to whether the user's data information is shared between base stations, CoMP can be divided into two categories: joint transmission / ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 陈致霖侯雪颖韩圣千杨晨阳王刚雷鸣
Owner BEIHANG UNIV
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