A Uplink Channel Estimation Method for Downlink Coherent Coordinated Multipoint Transmission

A technology of channel estimation and multi-point transmission, applied in the field of channel estimation and uplink channel estimation

Inactive Publication Date: 2011-12-14
BEIHANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For uplink channel estimation in CoMP systems, when the multi-cell multi-user SRSs are not orthogonal, the traditional least-squares channel estimation method will lead to noise amplification, resulting in poor estimation performance
Even if the SRSs of multiple cells and multiple users can be guaranteed to be orthogonal to each other, due to the limited transmit power of the user end, the least squares channel estimation method cannot guarantee the channel estimation quality between the base station and the users in the cooperative cell

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  • A Uplink Channel Estimation Method for Downlink Coherent Coordinated Multipoint Transmission
  • A Uplink Channel Estimation Method for Downlink Coherent Coordinated Multipoint Transmission
  • A Uplink Channel Estimation Method for Downlink Coherent Coordinated Multipoint Transmission

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Embodiment Construction

[0032]Taking a CoMP system in which two cells cooperate to serve four users as an example, there are two users in each cell. Assume that the number of antennas at the base station is 2, and the number of antennas at the user end is 1. In the uplink training phase, take the channel estimation of the first antenna of the first base station as an example.

[0033] The four users in the cooperation area generate their own frequency-domain SRS respectively. Assume that the method of generating SRS adopts the generation method of SRS in the LTE standard, that is, two users in the same cell adopt the cyclic shift structure of the same root ZC (Zadoff-Chu, personal name code name) sequence, and users in different cells use different root ZC sequences . Let the frequency domain SRS sequence length be N F , denote the frequency-domain SRS of the i-th user as t f i = t ...

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Abstract

An uplink channel estimation method for downlink coherent coordinated multi-point transmission, the steps of which are: 1. Multi-cell multi-users send SRS, and the base station converts time-domain received signals into frequency-domain received signals; 2. The base station converts multi-cell multi-users according to The energy of large-scale fading channels is sorted from large to small. Channels between multi-cell multi-users and the base station are estimated one by one in an iterative manner according to the ranking. 3. When estimating the channel of the i-th user in the first iteration, use the estimated user channel to reconstruct the relevant received signal and remove it from the received signal of the base station. Then use information such as large-scale fading channel energy to do robust channel estimation. 4. When estimating the channel of the i-th user in the mth (m>1) iteration, use the channels of the 1st to i-1th users estimated by this iterative process and the channel estimated by the m-1th iterative process Correlated received signals are reconstructed from the i-th to K-th users' channels and removed from the received signals of the base station. Then do robust channel estimation.

Description

(1) Technical field [0001] The present invention relates to channel estimation techniques in mobile communication systems, in particular to an uplink channel estimation method for downlink coherent coordinated multi-point transmission, which provides a channel for a downlink coherent coordinated transmission system in time division duplex (TDD) mode. Information uplink channel estimation method. It belongs to the technical field of mobile communication. [0002] (2) Background technology [0003] CoMP (Coordinated Multi-Point, coordinated multi-point) transmission can make full use of multi-base station, multi-user and multi-antenna resources to improve the average throughput of the cell and the throughput of the cell edge, so as to achieve IMT-A (International Mobile Telecommunications-Advanced, a new generation of global mobile communication) high spectrum utilization requirements. However, to realize CoMP downlink coherent coordinated multi-point transmission, the base ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/00H04B17/00H04L25/02
CPCH04L25/0202
Inventor 侯雪颖杨晨阳
Owner BEIHANG UNIV
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