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Adaptive switching method of SU-MIMO mode and MU-MIMO mode and adaptive switching apparatus thereof

A technology of adaptive switching and mode switching, which is applied in the directions of space transmit diversity, baseband system components, diversity/multi-antenna systems, etc., can solve problems such as system burden, system instability, and services that cannot meet the expected requirements, and achieve Improved overall performance, precise spectral efficiency, and improved stability

Inactive Publication Date: 2012-06-13
GUILIN UNIV OF ELECTRONIC TECH
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AI Technical Summary

Problems solved by technology

Since both SU-MIMO and MU-MIMO can achieve high system performance in a specific channel environment, considering the time-varying nature of the channel, using a single mode cannot meet the needs of the system in real time, which will inevitably cause system performance. decline
There are many method proposals for single-user and multi-user mode switching (such as the mode switching based on adaptive implicit feedback disclosed by Shanghai Bell Labs on May 12, 2011, and the Proportional Fairness (PF) based on Beijing University of Posts and Telecommunications. mode switching), but there is no in-depth consideration of the problems that will occur during switching. Frequent mode switching will be performed at the set switching point or the boundary of the cell, which will inevitably cause system instability and system burden. The quality of service has a very large impact, such as excessive power consumption of end users, services that cannot meet the expected requirements, etc.

Method used

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  • Adaptive switching method of SU-MIMO mode and MU-MIMO mode and adaptive switching apparatus thereof
  • Adaptive switching method of SU-MIMO mode and MU-MIMO mode and adaptive switching apparatus thereof
  • Adaptive switching method of SU-MIMO mode and MU-MIMO mode and adaptive switching apparatus thereof

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Embodiment 1

[0042] Embodiment 1 (for TDD system):

[0043] A method for adaptive switching of SU-MIMO and MU-MIMO modes, such as image 3 shown, including the following steps:

[0044] (1) The transmitter measures the channel information of the communication link, and calculates the average SINR in SU-MIMO mode and the SINR of a single user in MU-MIMO mode according to the channel information.

[0045] Before performing the adaptive switching process, the transmitting end and the receiving end should first agree on the MIMO mode indication (MMI) and the initial mode represented by the two modes. In this embodiment, it is agreed that MMI=0 is SU-MIMO mode, and MMI=1 is MU-MIMO mode; and the initial mode is agreed to be SU-MIMO, that is, MMI=0 is set to ensure the consistency of the mode in the communication process .

[0046] Due to the duality of the uplink and downlink, the transmitter can be used as the receiver. Therefore, when performing channel estimation, only the time it takes f...

Embodiment 2

[0079] Embodiment 2 (for the FDD system):

[0080] A method for adaptive switching of SU-MIMO and MU-MIMO modes, comprising the steps of:

[0081] (1) The receiving end measures the channel information of the communication link, and calculates the average SINR in SU-MIMO mode and the SINR of a single user in MU-MIMO mode according to the channel information.

[0082] Before performing the adaptive switching process, the transmitting end and the receiving end should first agree on the MIMO mode indication (MMI) and the initial mode represented by the two modes. In this embodiment, it is agreed that MMI=0 is SU-MIMO mode, and MMI=1 is MU-MIMO mode; and the initial mode is agreed to be SU-MIMO, that is, MMI=0 is set to ensure the consistency of the mode in the communication process .

[0083] Due to the asymmetry of the channel, it is necessary to feed back PMI, CQI Index and MMI to the transmitter. When performing channel estimation, not only the time spent on channel estimati...

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Abstract

The invention discloses an adaptive switching method of an SU-MIMO mode and an MU-MIMO mode and an adaptive switching apparatus thereof. Estimation is carried out on a current signal environment to calculate SINRs of an SU-MIMO mode and an MU-MIMO mode; according to the SINRs, table looking up is carried out to obtain matched modulation modes and error rates; and then, spectral efficiencies of the two modes are calculated and then are compared as well as the mode with the high spectral efficiency is used as an optimal mode in a channel environment. In addition, a tolerance mechanism is added in the switching process so as to avoid a ping-pong effect. According to the invention, characteristics of stable performance, a few response time and low system load can be realized.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an adaptive switching method and device for SU-MIMO and MU-MIMO modes. Background technique [0002] The development of wireless communication technology is changing with each passing day, and more and more wireless services have entered our life, and the requirements for data transmission rate have also been higher and higher. But the lack of wireless resources has become a bottleneck restricting the development of wireless communication. Making full use of precious spectrum resources and improving the utilization of spectrum resources has become a hot issue in wireless communication research. Multiple-input multiple-output (MIMO) technology can achieve linear increase in capacity without increasing spectrum resources and antenna transmission power, and has become the core technology of wireless communication. From the perspective of the number of users ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04L25/02
Inventor 张红梅吴阿沛张全君陈俊彦
Owner GUILIN UNIV OF ELECTRONIC TECH
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