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Self-adaptive design method for intelligent reflecting surface shift matrix in large-scale MIMO system

A design method and reflective surface technology, applied in transmission systems, radio transmission systems, network planning, etc., can solve problems such as limited phase adjustment of digital phase shifters, difficult estimation of channel vectors, etc., to reduce hardware and power consumption costs, computing The effect of reducing the amount and saving time and cost

Active Publication Date: 2019-09-20
SOUTHEAST UNIV
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Problems solved by technology

Unlike analog phase shifters, digital phase shifters can only make limited phase adjustments
In addition, since the smart reflector only passively receives and forwards the signal, its channel vector is difficult to estimate

Method used

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  • Self-adaptive design method for intelligent reflecting surface shift matrix in large-scale MIMO system
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  • Self-adaptive design method for intelligent reflecting surface shift matrix in large-scale MIMO system

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Embodiment Construction

[0034] The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0035] The present invention proposes an adaptive design method of the phase shift matrix of the intelligent reflector in the massive MIMO system, the method includes the following steps:

[0036] (1) The phase shift matrix design before signal transmission includes the following steps:

[0037] (1.1) The intelligent reflecting surface is equipped with N reflecting units, and each reflecting unit is equipped with a digital phase shifter with a quantization accuracy of B. When, follow the steps below to optimize the phase shift matrix design:

[0038] Step (a), the base station transmits a single-frequency signal x from any antenna, and is received by the user after being reflected by the smart reflecting surface. The received signal is:

[0039] y=h H Θg R x+n

[0040] among them, Is the channel vector from the base station to the reflecting su...

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Abstract

The invention provides a self-adaptive design method for an intelligent reflection phase shift matrix in a large-scale MIMO system. In a downlink, a base station transmits a signal through a large-scale antenna array, and an intelligent reflecting surface performs phase shift operation on the received signal and then reflects the received signal to a user. According to a corresponding communication environment, a phase shift matrix design method or a random phase shift matrix design method is adaptively selected and optimized. The phase shift matrix design is optimized by transmitting a single-frequency signal and optimizing the phase shift matrix of the intelligent reflecting surface under the criterion of maximizing the receiving power of the user side. The random phase shift matrix design randomly determines the phase of each reflective element. The method is easy to operate and low in calculation complexity, the two phase shift matrix design methods can obtain high power efficiency and spectrum efficiency, any channel state information of the intelligent reflecting surface is not needed, and the method has important significance for design and implementation of a large-scale MIMO communication system adopting the intelligent reflecting surface.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to an adaptive design method of an intelligent reflecting surface phase shift matrix in a large-scale MIMO system. Background technique [0002] As a key technology of the fifth generation (5G) and future mobile communications, massive MIMO (Multiple Input Multiple Output) technology can achieve wide cell coverage through large-scale antenna arrays, while using spatial freedom to obtain high spectral efficiency. These advantages of massive MIMO systems can meet the rapidly growing data transmission needs in the future 5G era. However, in actual communication systems, some occlusions or obstacles, such as buildings, trees, cars, and even animals, will inevitably appear. In order to solve this problem and ensure a smooth user experience, the typical solution is to add additional transmission links to maintain communication links. For example, a forwarding relay ...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0426H04W16/14
CPCH04B7/0413H04B7/0426H04W16/14Y02D30/70H04B7/04013
Inventor 许威徐锦丹
Owner SOUTHEAST UNIV
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