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3D MIMO beamforming method with robustness in multi-cell OFDMA network

A three-dimensional beam and robust technology, applied in the field of communication, can solve problems that affect the accuracy of channel estimation, channel inaccuracy, and difficulty in obtaining channel state information by base stations

Inactive Publication Date: 2014-10-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, in actual scenarios, it is difficult for the base station to obtain perfect channel state information
On the one hand, because the channel state information is usually obtained by channel estimation and channel feedback, however limited feedback or time delay will lead to channel inaccuracy
In addition, the rapid movement of users and the time-varying characteristics of the channel will also affect the accuracy of channel estimation.
The inaccuracy of channel estimation will generate channel estimation error, which will greatly degrade the performance of the system
On the other hand, in 3D MIMO, additional system parameters need to be estimated, adding a degree of freedom, making it more difficult to obtain reliable CSI

Method used

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  • 3D MIMO beamforming method with robustness in multi-cell OFDMA network

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[0032] In order to make the object, technical solution and advantages of the invention clearer, the embodiments of the invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Consider as attached figure 2 In the cellular model shown, each cell has three sectors, each sector has a base station, each sector uses a different carrier to serve users, and the sectors can be frequency reused. The mth base station serves user UEmk, and base stations in other sectors have co-channel interference with this user. Each base station maintains a location list of other surrounding interfering base stations.

[0034] In the simulation, using the image 3System shown: topology of 19 c...

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Abstract

The invention relates to a 3D MIMO beamforming method with robustness in a multi-cell OFDMA network, and belongs to the technical field of communication. The 3D MIMO beamforming method comprises the steps that an uncertain constraint condition is converted into a probability model according to a channel error model and through the chance constraint optimization method, a probability constraint condition is converted into a certain constraint condition through statistical distribution of fading channels, and finally a distributed beam forming algorithm is proposed to optimize the transmitting power of a base station. Compared with the prior art, under the condition of the non-perfect channels and the angle influence of users in 3D MIMO in the horizontal direction and the vertical direction, the service quality is guaranteed for the users through the distributed algorithm, the total transmitting power of the base station is minimized, and therefore the purpose of saving resources is achieved.

Description

Technical field: [0001] The invention relates to a three-dimensional beamforming method, in particular to a robust three-dimensional beamforming (3D MIMO Beamforming) method under a multi-cell Orthogonal Frequency Division Multiple Access (OFDMA) network, and belongs to the technical field of communication. Background technique [0002] The new generation of mobile communication systems (such as LTE, WiMAX) generally adopts Orthogonal Frequency Division Multiple Access (OFDMA) technology, and it is hoped that the frequency reuse factor will be as close to 1 as possible to improve spectrum efficiency. Reducing the reuse factor aggravates the inter-cell co-channel interference (CCI), making it a bottleneck restricting the system capacity. The base station cooperation technology proposed in recent years reduces CCI by sharing multi-cell user information and cooperatively adjusting the physical layer and link layer parameters of multiple base stations. The theoretical performanc...

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Application Information

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IPC IPC(8): H04B7/06
CPCY02D30/70
Inventor 邢成文周园费泽松匡镜明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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