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 charac

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  • 3D MIMO beamforming method with robustness in multi-cell OFDMA network
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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 objectives, technical solutions and advantages of the invention more clear, the embodiments of the invention will be described in detail below with reference to the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, 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, and each sector uses a different carrier to serve users, and frequency reuse is possible between sectors. The mth base station serves the user UEmk, and base stations in other sectors have co-channel interference to the user. Each base station maintains a location list of other surrounding interfering base stations.

[0034] In the simulation, such as image 3System ...

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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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