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Channel rank estimation method, system and device during multi-stream beamforming transmission

A beamforming and channel rank technology, applied in the field of rank estimation, can solve the problems of inapplicability of multi-stream beamforming transmission, no rank value estimation scheme, and inaccurate estimation.

Active Publication Date: 2010-06-23
DATANG MOBILE COMM EQUIP CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the existing technology is that there is no solution for estimating the rank value during multi-stream beamforming transmission. In the prior art, the rank value is fed back by the terminal during single-stream beamforming transmission. For multi-stream beamforming transfer does not apply
And since there is no one-to-one correspondence between the public port pilot and the rank of the dedicated port, the UE's estimation of the rank value will be inaccurate during multi-stream beamforming transmission

Method used

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Embodiment 1

[0054] Such as image 3 As shown, it is a flow chart of the method for estimating the rank value of the channel during multi-stream beamforming transmission in Embodiment 1 of the present invention. In this embodiment, the base station estimates the rank value of the channel, including the following steps:

[0055] Step S301, the UE estimates the CQI of the downlink bandwidth according to the available common pilot. The number of available common pilot ports depends on the common pilot signal sent by the base station, and the UE detects the information of PBCH (Physical Broadcast Channel, Physical Broadcast Channel) to obtain the number of actually sent ports. As an embodiment of the present invention, for the purpose of unified scheduling, the method of estimating the CQI of the UE according to the common pilot is notified to the UE by the high-level signaling of the base station, wherein the method of estimating the CQI can be based on the transmission diversity method or ca...

Embodiment 2

[0074] Such as Figure 5 As shown, it is a flow chart of the method for estimating the rank of the channel during multi-stream beamforming transmission in Embodiment 2 of the present invention. The difference between this embodiment and Embodiment 1 is that the UE obtains the rank value of the channel and feeds it back to the base station, including the following step:

[0075] Step S501, the UE estimates the SINR value of the channel according to the common pilot and / or the dedicated pilot.

[0076] Step S502, the UE performs eigenvalue decomposition on the common pilot signal to obtain the channel eigenvalue λ i .

[0077] Step S503, the UE according to the SINR value and the characteristic value λ of the channel i Get the rank value of the channel. As an embodiment of the present invention, in this embodiment, the UE according to the SINR value and the characteristic value λ of the channel i The manner of obtaining the rank value of the channel is similar to that propo...

Embodiment 3

[0087] Such as Figure 7 As shown, it is a flow chart of the method for estimating the rank value of the channel during multi-stream beamforming transmission in Embodiment 3 of the present invention. This embodiment is basically similar to Embodiment 2, except that the UE estimates the rank value of the channel in a different way. Include the following steps:

[0088] In step S701, the UE estimates the SINR value of each beamforming data stream according to the dedicated pilot corresponding to each antenna port.

[0089] In step S702, the UE acquires the rank value of the channel according to the estimated SINR value of each beamforming data stream.

[0090] In step S703, the UE feeds back the acquired rank value of the channel to the base station.

[0091] Similarly, as a preferred embodiment, the present invention can also combine Embodiment 1 with this embodiment. The UE and the base station estimate the rank value at the same time. After the UE feeds back its estimated ran...

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Abstract

The invention provides a channel rank estimation method during multi-stream beamforming transmission, which comprises the following steps: a base station receives a CQI which is fed back by a user equipment UE and detected by the UE according to a common pilot; the base station estimates uplink channel information according to an uplink detection pilot signal sent by the UE; and the base station obtains the rank of a channel according to the CQI fed back by the UE and the estimated uplink channel information. The estimation method can effectively solve the estimation of the rank value during the multi-stream beamforming transmission, further support the rank self-adaptive transmission during the multi-stream beamforming transmission and improve the flexibility of a system.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, system and device for estimating channel rank during multi-stream beamforming transmission. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, the common pilot is common to the cell, and there are currently 4 ports of the common pilot signal, such as Figure 1A and Figure 1B As shown, they are respectively schematic diagrams of common pilot mapping of a regular CP (Cyclic Prefix, cyclic prefix) and an extended CP in the LTE system in the prior art, which are sent on the full bandwidth. The dedicated pilot is based on UE (User Equipment, user equipment), that is, each user can only receive its own dedicated pilot signal. In the LTE system, the port number of the dedicated pilot is 5, such as Figure 2A and Figure 2B Shown are the schematic diagrams of the dedicated pilot mapping of the conventional CP and the e...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L25/02
CPCH04B7/063H04L5/0048
Inventor 缪德山孙韶辉秦飞
Owner DATANG MOBILE COMM EQUIP CO LTD
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