Large-scale MIMO (Multiple Input Multiple Output) self-adaptive multi-beam forming method in high speed scene

A beamforming and self-adaptive technology, applied in diversity/multi-antenna systems, space transmit diversity, electrical components, etc., can solve problems such as large delay, inability to adjust beams to target users, and fast time-varying channels

Inactive Publication Date: 2016-09-07
CHONGQING UNIV
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Problems solved by technology

On the other hand, due to the relatively high-speed movement between the receiving end and the transmitting end, multipath time variation and Doppler frequency shift will cause serious channel fast time variation, so no matter whether it is through time division duplex (TDD) uplink or downlink The channel state information (CSI) obtained by reciprocity or frequency division duplex (FDD) feedback will have a large delay. At this time, if the beamforming design is carried out through the CSI, the beam cannot be adjusted to Target users

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  • Large-scale MIMO (Multiple Input Multiple Output) self-adaptive multi-beam forming method in high speed scene
  • Large-scale MIMO (Multiple Input Multiple Output) self-adaptive multi-beam forming method in high speed scene
  • Large-scale MIMO (Multiple Input Multiple Output) self-adaptive multi-beam forming method in high speed scene

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[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0051] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred t...

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Abstract

The invention provides a large-scale MIMO (Multiple Input Multiple Output) self-adaptive multi-beam forming method in a high speed scene. Specifically, the method is that the large-scale MIMO wave forming design in the high speed scene is carried out based on a direction of arrival DoA specific to the strong correlation of MIMO channels resulting from clear sparse scatterers and LOS (Line of Sight) paths in a high-speed rail environment. Beam forming is carried out on each vehicular mobile carriage terminal MCT. The number of transmitting antennas required by each sub-beam is self-adaptively adjusted through calculation of signal to interference plus noise ratios SINRs of different sub-beams. When a trail is far away from a base station, the interferences among the sub-beams are serious. According to the method provided by the invention, the number of the sub-beams can be self-adaptively adjusted according to the total capacity of a system, and the performance of the system is improved.

Description

technical field [0001] The invention mainly relates to a communication mechanism in a high-speed rail environment, and an adaptive multi-beam forming method designed for massive MIMO. Background technique [0002] With the rapid development of high-speed railways, the GSM-R (GSM for Railway) system used by China Railway Communications is mainly used for train control information and provides a maximum data rate of 200kb / s, which can no longer meet the needs of high-speed railway users for high-speed mobile Internet services . For this reason, the International Union of Railways UIC plans to gradually evolve from GSM-R to LTE-R (Long Term Evolution for Railway). Studies have shown that deploying dozens or even hundreds of large-scale Multiple Input Multiple Output (MIMO) antennas on the base station side can effectively improve the spectral efficiency to tens or even hundreds of bits / s / Hz. Theoretically, as the number of antennas increases, noise and fast fading will gradua...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/043H04B7/0617
Inventor 廖勇李瑜锋
Owner CHONGQING UNIV
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