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Movement velocity-based antenna scale selection method applied in FDD large-scale MIMO system

A mobile speed and large-scale technology, applied in the field of communication, can solve the problems of reducing system spectrum efficiency, channel estimation and feedback overhead increase, and achieve the effect of improving spectrum efficiency

Active Publication Date: 2018-09-04
XI AN JIAOTONG UNIV
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Problems solved by technology

This is because the number of antennas turned on increases, although it can make more use of the degree of freedom in the space space, but on the other hand, it increases the overhead of channel estimation and feedback and reduces the spectral efficiency of the system.

Method used

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  • Movement velocity-based antenna scale selection method applied in FDD large-scale MIMO system
  • Movement velocity-based antenna scale selection method applied in FDD large-scale MIMO system
  • Movement velocity-based antenna scale selection method applied in FDD large-scale MIMO system

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Embodiment Construction

[0022] The present invention provides an antenna scale selection method based on moving speed in an FDD massive MIMO system. In an FDD massive MIMO system, a base station arranges a large-scale antenna array, and the cost of channel estimation and feedback is proportional to the antenna in the base station number, and the coherence time of the channel is limited.

[0023] see figure 1 , the scenario where the scattering environment at both the transmitter and the user end is very rich. At this time, the correlation between channels from different transmitting antennas to receiving antennas is very weak, and can be approximately regarded as independent.

[0024] see figure 2 , during the coherence time, the channel can be approximately considered as invariant. One part is used for channel estimation and feedback, and the other part is used for data transmission. In order to improve the spectral efficiency of the system, the overhead of channel estimation and feedback is re...

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Abstract

The invention discloses a movement velocity-based antenna scale selection method applied in an FDD large-scale MIMO system. The method comprises the steps that a user side feeds back a pilot signal toa base station side by adopting an analog feedback scheme, and the base station side estimates out a downlink channel; and data is transmitted through zero-forcing precoding, then the opened antennanumber is derived according to the movement velocity of a user and the spectral efficiency of the MIMO system, the relation between the movement velocity and the optimal antenna scale is obtained, andthe opened antenna scale is selected. According to the method, the ratio of channel estimation and feedback in coherence time can be reasonably adjusted according to the difference of the movement velocities of users, an optimal compromise is made between the transmit diversity gain and the channel estimation and feedback overhead, and then the spectral efficiency of the system is effectively improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of communication, and in particular relates to a method for selecting an antenna scale based on moving speed in an FDD massive MIMO system. 【Background technique】 [0002] By arranging large-scale antenna arrays at the base station, the massive MIMO system can fully tap and utilize the degree of freedom in the airspace, and improve the spectral efficiency and energy efficiency of the system, which has received extensive attention. Most of the current cell systems use the FDD mode, which has greater advantages in uplink and downlink symmetric transmission and delay performance. In order to be better compatible with the current cell system and to achieve performance gains of massive MIMO systems, research on FDD Massive MIMO systems are of great significance. [0003] The key to obtaining the performance gain of the massive MIMO system is that the base station can obtain the channel state information in tim...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/06H04L25/02
CPCH04B7/0456H04B7/061H04B7/0626H04B7/0632H04B7/0691H04L25/0228
Inventor 范建存王晨阳
Owner XI AN JIAOTONG UNIV
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