Intelligent reflector-assisted multi-cell robust joint transmission beam optimization method

A joint transmission and beam optimization technology, applied in the transmission system, radio transmission system, space transmit diversity, etc.

Pending Publication Date: 2021-08-27
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Recently, researchers have studied the work on IRS-assisted CoMP systems, mainly focusing on improving the performance of cell edge users. However, these works assume ideal CSI

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further 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.

[0047] Such as figure 1 As shown, the present invention studies the IRS-assisted multi-cell CS / CB-CoMP downlink multi-user system, and the present invention deploys IRS at the cell border to assist figure 1 Cell-edge users of a multi-cell system are shown, where inter-cell interference can be mitigated by means of IRS. Specifically, by designing the phase shift of the reflective elements of the IRS, the inter-cell interference reflected by the IRS can be destructively imposed on the direct interferenc...

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Abstract

The invention relates to an intelligent reflector-assisted multi-cell robust joint transmission beam optimization method, which comprises the following steps of: firstly, considering that an error exists in intelligent reflector-user link channel estimation, constructing an optimization model of joint multi-base station transmission beam forming and intelligent reflector shift, and considering the fairness of cell users, ensuring the minimum achievable rate of cell edge users according to the invention; secondly, due to variable height coupling, decomposing the problem into two problems of base station beam forming and intelligent reflecting surface shifting, converting the base station beam forming problem into a convex problem by adopting an S-Procedure theorem and convex semi-definite relaxation, and providing an iterative algorithm based on dichotomy to obtain an optimal solution of the intelligent reflecting surface shifting; finally, alternately solving the two problems until convergence. According to the method provided by the invention, the total transmitting power of the base station can be minimized under the condition that all possible channel errors are realized, and meanwhile, the minimum achievable rate requirement of the worst user is met.

Description

technical field [0001] The invention relates to a robust transmission method, in particular to a robust joint transmission beam optimization method for multiple cells assisted by an intelligent reflection surface, and belongs to the technical field of wireless communication. Background technique [0002] An intelligent reflecting surface (Intelligent Reflecting Surface, IRS) is a planar array composed of a large number of passive elements, each of which can independently induce a specific phase shift on the incident electromagnetic wave through an intelligent controller, so as to use the reflected signal to cooperatively create a favorable wireless transmission channel. By cleverly adjusting the phase shift of all elements at the IRS, reflected signals can be added coherently at desired receivers to increase received signal power, or destructively at undesired receivers to avoid interference and enhance safety. By jointly designing the transmit beamforming and IRS phase shi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/024H04B7/06
CPCH04B7/024H04B7/0617H04B7/04013
Inventor 高晖杨晓宇许文俊曹若菡
Owner BEIJING UNIV OF POSTS & TELECOMM
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