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Open loop MIMO method, base station and user equipment based on direction of arrival

A technology of user equipment and direction of arrival, applied in the field of wireless transmission, can solve the problems of inaccurate PMI value of OL-MIMO system, system performance needs to be improved, MIMO system performance cannot be further improved, etc.

Inactive Publication Date: 2009-08-12
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inaccurate PMI values ​​of OL-MIMO systems based on fixed PMI and cyclic PMI, the system performance needs to be improved
[0010] Since the PMI is unknown to the precoder of the open-loop MIMO system, if the precoder does not have accurate PMI information for precoding processing, the performance of the MIMO system cannot be further improved

Method used

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  • Open loop MIMO method, base station and user equipment based on direction of arrival
  • Open loop MIMO method, base station and user equipment based on direction of arrival
  • Open loop MIMO method, base station and user equipment based on direction of arrival

Examples

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Effect test

no. 1 example

[0061] Figure 4 A schematic diagram of a 2×2 downlink SU-MIMO system according to the first embodiment of the present invention is shown. Such as Figure 4 As shown, both the base station 300 and the user equipment according to the first embodiment have two antennas, and the user equipments 200-1 and 200-2 feed back information such as CQI and Rank to the base station 300 through an uplink. In view of the fact that the user equipments 200-1 and 200-2 have the same structure, the user equipment 200-1 is taken as an example for detailed description below.

[0062] Figure 5 shows a structural block diagram of a base station according to a first embodiment of the present invention, Image 6 A structural block diagram of the user equipment according to the first embodiment of the present invention is shown.

[0063] Such as Figure 5 As shown, the base station according to the first embodiment of the present invention includes a radio frequency unit 117, a speed measurement ...

no. 2 example

[0097] Figure 15 A schematic diagram of a 4×4 downlink MU-MIMO system according to the second embodiment of the present invention is shown. Such as Figure 15 As shown, the base station 300 according to the second embodiment has four antennas, wherein the user equipments 200-1, 200-2, 200-3 and 200-4 each have one antenna, and they feed back the CQI and Rank and other information. Since the user equipments 200-1, 200-2, 200-3, and 200-4 have the same structure, the following uses the user equipment 200-1 as an example to describe in detail.

[0098] Figure 16 shows a structural block diagram of a base station according to a second embodiment of the present invention, Figure 17 A structural block diagram of a user equipment according to a second embodiment of the present invention is shown.

[0099] Such as Figure 16 As shown, the base station according to the second embodiment of the present invention includes a radio frequency unit 317, a speed measurement unit 310,...

no. 3 example

[0129] Figure 22 A schematic diagram of a 4×4 uplink MU-MIMO system according to the third embodiment of the present invention is shown. Such as Figure 22 As shown, the base station 300 according to the third embodiment has four antennas, and each user equipment has one antenna. Since the user equipments 200-1, 200-2, 200-3, and 200-4 have the same structure, the following uses the user equipment 200-1 as an example to describe in detail.

[0130] Figure 23 shows a structural block diagram of a base station according to a third embodiment of the present invention, Figure 24 A structural block diagram of a user equipment according to a third embodiment of the present invention is shown.

[0131] Such as Figure 23 As shown, the base station according to the third embodiment of the present invention includes a radio frequency unit 517, a rank determination unit 512, a MIMO mode determination unit 513, a MIMO mode and rank notification unit 516, a resource allocation uni...

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Abstract

The invention discloses an open-loop MIMO method based on direction of arrival, a base station and user equipment, which are used in the technical field of wireless transmission. The method comprises the following steps that: the user equipment is divided into low-speed, middle-speed and high-speed user equipment according to the moving speed of the user equipment; the low-speed user equipment is set to adopt a closed-loop MIMO mode, and the middle-speed and high-speed user equipment is set to adopt an open-loop MIMO mode; then a sending end measures the direction of arrival of a feedback link, and estimates a precoding matrix index number of a sending link according to the direction of arrival obtained through the measurement; a rank of an MIMO system is decided; an MIMO sending mode is decided according to the rank and the precoding matrix index number; then the MIMO mode and the rank are sent to a receiving end; the receiving end intercepts the MIMO mode and the rank; and finally, the receiving end performs feedback according to intercepted information. The invention aims at the middle-speed and high-speed user equipment to provide an open-loop MIMO system and an open-loop MIMO device based on the direction of arrival, and has the characteristics of simple design and good system performance.

Description

technical field [0001] The invention relates to a wireless communication method and equipment, in particular to a direction-of-arrival-based open-loop MIMO method, a base station and user equipment, and is applicable to the technical field of wireless transmission. Background technique [0002] Multiple-Input Multiple-Output Antenna (MIMO) technology is considered to be a major breakthrough in smart antenna technology in today's wireless communication field. As the most important means to increase the system transmission rate, MIMO can double the capacity and spectrum utilization of the communication system without increasing the system bandwidth. Therefore, the view that MIMO technology will be the key technology that must be adopted in the new generation mobile communication system has formed a consensus and has received extensive attention. [0003] In view of the fact that the MIMO technology can achieve high data throughput, the third generation partnership project (3G...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04B7/06H04B7/08
CPCH04B7/0665H04W64/006H04W24/10H04B7/0619
Inventor 梁永明刘仁茂陈晨丁铭黄磊
Owner SHARP KK
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