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A Channel Estimation Method Based on ICA Filtering Method

A channel estimation and channel technology, applied in the direction of baseband system components, etc., can solve problems such as pilot pollution, and achieve the effect of strong ability, large capacity, and excellent channel estimation ability

Inactive Publication Date: 2018-04-17
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of channel estimation method based on ICA filtering method, this method can effectively solve the problem of pilot frequency pollution, and the estimation of channel is not restricted by channel coherent time period

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  • A Channel Estimation Method Based on ICA Filtering Method
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  • A Channel Estimation Method Based on ICA Filtering Method

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Embodiment Construction

[0028] The present invention is described in further detail below in conjunction with accompanying drawing:

[0029] The massive MIMO system scenario is set as follows: Considering I cell, M antennas are configured at the base station, the number of UEs in the MIMO system is K, each user has a single antenna, and a single cell has a single user scenario. The signal r(t) is:

[0030]

[0031] in: is the transmitted signal, and the received signal r(t) consists of N different phase information and delay information Weighted combination, z(t) is additive Gaussian white noise, z(t) obeys distribution, without loss of generality, assume τ 1 2 L , since the transmitter, cluster and receiver are constantly moving in the scene, the parameters α and τ are time-varying random variables, when T 0 is less than the channel coherence time, the parameters α and τ do not change much in the observation interval.

[0032] In a MIMO system, the signal received by each antenna can be...

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Abstract

The invention discloses a channel estimation method based on an ICA filtering method, which includes the following steps: assuming that users in different cells do not transmit pilot signals at different times and frequencies, and the base station has no downlink transmission data, for each cell, the channel has no pilot signal It is estimated under pollution conditions, and the channel HNPC of each cell is obtained; observation samples of known non-pollution channels are obtained, and the observation samples of each non-pollution channel are the weighted sum of several independent components, and a fourth-order cumulant matrix is ​​set; according to formula 4 The order cumulant matrix and the channel of each cell are obtained by the ICA filter YNPC, and then channel estimation is performed through the ICA filter YNPC. The invention can effectively solve the problem of pilot pollution, and the estimation of the channel is not limited by the channel coherent time period.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and relates to a channel estimation method, in particular to a channel estimation method based on an ICA filtering method. Background technique [0002] In the massive MIMO technology, the use of numerous antennas at the base station to achieve spatial multiplexing and interference cancellation has become one of the key technologies for improving the system. In a massive MIMO system, users in the same cell need to transmit mutually orthogonal pilot sequences to achieve channel estimation. Unfortunately, when the channel coherence time is short or the number of users in the cell is large, there are not enough orthogonal pilots to be allocated to users. Therefore, there are users using the same pilot in different cells, and these users interfere with each other during channel estimation, and this interference is called "pilot pollution". Pilot pollution is the main factor that limit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
Inventor 陈志刚赵拯
Owner XI AN JIAOTONG UNIV