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Uplink channel estimation method based on downlink coherent cooperative multicast transmission

A technology of channel estimation and multi-point transmission, which is applied in the field of channel estimation and uplink channel estimation, and can solve the problems of unguaranteed channel estimation quality, poor estimation performance, noise amplification, etc.

Inactive Publication Date: 2010-01-06
BEIHANG UNIV
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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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  • Uplink channel estimation method based on downlink coherent cooperative multicast transmission
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  • Uplink channel estimation method based on downlink coherent cooperative multicast transmission

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Embodiment Construction

[0030] 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.

[0031]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 f ...

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Abstract

The invention relates to an uplink channel estimation method based on downlink coherent cooperative multicast transmission. The method comprises the following steps: firstly, multiple users in multiple cells transmit SRSs, and a base station transforms a time-domain receiving signal into a frequency-domain receiving signal; secondly, the base station performs sequencing to the multiple users in the multiple cells according to the large-scale fading channel energy in series, and channels between the multiple users in the multiple cells and the base station are estimated one by one in sequence by an interative method; thirdly, when the channel of the ith user is estimated by the first iteration, a related receiving signal is reconstructed by using the estimated user channel and is eliminated from the receiving signal of the base station, and the robust channel estimation is performed by using the large-scale fading channel energy; and fourthly, when the channel of the ith user is estimated by the mth (m is greater than 1) iteration, a related receiving signal is reconstructed by using the channels used for the users (from 1 to i-1) and obtained during the m iteration through the estimation and the channels used for the users (from i to K) and obtained during the (m-1)th iteration through the estimation and is eliminated from the receiving signal of the base station, and then the robust channel estimation is carried out.

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. (2) Background technology [0002] 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 station n...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04L25/02
CPCH04L25/0202
Inventor 侯雪颖杨晨阳
Owner BEIHANG UNIV
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