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Improved channel state information (CSI) limited feedback method for multi-user multiple input multiple output (MU-MIMO) system

A limited and algorithmic technology, applied in the field of limited feedback of channel state information, to achieve superior performance

Inactive Publication Date: 2011-07-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

However, neither of these two antenna combining algorithms can maximize E[SINR k ] point of view

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  • Improved channel state information (CSI) limited feedback method for multi-user multiple input multiple output (MU-MIMO) system
  • Improved channel state information (CSI) limited feedback method for multi-user multiple input multiple output (MU-MIMO) system
  • Improved channel state information (CSI) limited feedback method for multi-user multiple input multiple output (MU-MIMO) system

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Embodiment Construction

[0026] Technical scheme of the present invention comprises the following steps:

[0027] Step 1: The user uses the CSI-RS sent by the base station to perform channel estimation; for the kth user, after u k After the signal is detected, the received signal can be expressed by the following formula, where the y k is the signal received by user k, n′ k is the complex white Gaussian noise superimposed on the equivalent channel, G i is the precoding vector of the i-th user M×1:

[0028] r k = u k y k = u k H k G k d k + u k H k Σ i ∈ S , i ≠ k ...

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Abstract

The invention discloses an improved channel state information (CSI) limited feedback method. In the method, a signal detection algorithm of a receiver and a channel direction information (CDI) selection are combined for designing to maximize E(SINRk). If a multi-user multiple input multiple output (MU-MIMO) system is required to be converted into a multi-user multiple input single output (MU-MISO) system by antenna combining on the premise of limited feedback, higher system performance can be realized by an improved antenna combining algorithm provided by the invention compared with the other currently researched combining algorithms.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to channel state information (CSI) limited feedback technology. Background technique [0002] How to improve the wireless data transmission rate has always been accompanied by the design of the current communication system. Improvements in channel coding, modulation and scheduling in the past have been gradually applied to current wireless communication systems. The next generation mobile communication system needs adaptive technology that can make full use of channel diversity. These adaptive techniques allow the transmitter signal to be matched to instantaneous channel conditions. This indicates that the sending end needs to obtain certain information of the wireless channel, which is usually called channel state information (CSI) at the sending end, such as: channel state, received power, and interference information. In the past frequency division duplex system, ...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L25/02
Inventor 张君席晓琳张忠培
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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