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Method for obtaining channel quality in multi-input multi-output system

A technology of channel quality and acquisition method, which is applied in the field of calculation of channel quality indicators in multiple-input multiple-output systems, and can solve problems such as being unable to make a prediction

Active Publication Date: 2015-06-03
创客帮(山东)科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the interference can be roughly estimated, but this method can only be used when there is a codebook. If there is no codebook, there are many possibilities for interference precoding, so it is impossible to make a prediction

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  • Method for obtaining channel quality in multi-input multi-output system
  • Method for obtaining channel quality in multi-input multi-output system
  • Method for obtaining channel quality in multi-input multi-output system

Examples

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no. 1 example

[0159] In LTE Release 8, the transmission based on the single-antenna port 5 belongs to an application of a single-stream beamforming (Beamforming, BF) technology. In order to enhance the performance of the downlink non-codebook transmission method, a new transmission method is proposed in the enhanced version of LTE Release 9, which belongs to a non-codebook spatial multiplexing method with a rank of 2, that is, dual-stream BF technology for the transmission of two antenna ports.

[0160] In the single-user dual-stream BF scenario, the eNB can decide the precoding processing method by itself because it is not based on the codebook. Although the eNB generally makes the precoding vectors of the two layers orthogonal, due to various errors in the actual system, when the signal reaches the UE, the interference between the layers is difficult to avoid. In this case, the interference average can be used Method to calculate the CQI:

[0161] The CQI of the first layer is:

[0162...

no. 2 example

[0206] Dual-stream BF can also support multi-user MIMO, and each user occupies only one stream (rank is 1). The first embodiment requires the rank of the single-user channel to be 2, and if the rank of the channel is 1, multi-user MIMO is required for spatial multiplexing. If the rank of the channel is 1 and there is no user pairing, it is necessary to use single-user single-stream BF. In this single-stream BF mode, to support dynamic switching between single-user single-stream BF and multi-user BF, this embodiment adopts a differential CQI feedback method.

[0207] First calculate the CQI of the single-stream BF:

[0208] CQI SU , 1 = Q ( SINR SU , 1 ) = Q ( f 1 ...

no. 3 example

[0249] Mode 5 of Release 8 of LTE supports codebook-based multi-user MIMO transmission. In Release 10 of Enhanced Long Term Evolution (LTE-Advanced), UE can also use codebook when feeding back CQI and PMI, but in order to enhance the performance of MU-MIMO, eNB can still support non-codebook multi-user during transmission MIMO transmission. In this mode, since DMRS is also used for demodulation, the implementation of multi-user dual-stream BF can also use DMRS to estimate interference. The difference from multi-user dual-stream BF is that more than two users can be multiplexed. The following is the CQI calculation method of user m' when there are M users:

[0250] SINR MU , m ′ = f m ′ * ( R ^ ...

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Abstract

A channel quality obtaining method and a reception end in a multi-input multi-output system are disclosed in the invention. The reception end calculates the channel quality to obtain the channel quality information according to the method. In the method, the reception end estimates the influence to the channel quality by the current interference according to the past interference within a time interval up to the current moment, and then obtains the channel quality information. According to the method presented in the invention, the reception end is able to obtain relatively precise channel quality information in case of multi-layer interference and feed it back to the transmission end, thus better estimation effect can still be obtained under the condition of no code book.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for calculating channel quality indicator (CQI) in a multiple-input multiple-output (MIMO) system. Background technique [0002] In wireless communication, if multiple antennas are used at the sending end (eNB), the transmission rate can be improved by adopting spatial multiplexing, that is, the sending end transmits different data at different antenna positions on the same time-frequency resource. Multiple antennas are also used at the receiving end (UE), and in the case of a single user, resources of all antennas can be allocated to the same user. The above transmission form is called Single User MIMO (SU-MIMO). In addition, resources in different antenna spaces can also be allocated to different users in the case of multiple users. This transmission form is called multi-user MIMO (MU-MIMO). [0003] In the above two cases of single-user MIMO and multi-user MIMO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/08H04B7/04
CPCH04B7/0417H04B7/063H04B7/0632H04B7/0634H04B7/0639
Inventor 李儒岳
Owner 创客帮(山东)科技服务有限公司