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Low-feedback precoding and reception merging combined method of large-scale antenna array system

A large-scale antenna and precoding technology, which is applied in radio transmission systems, transmission systems, advanced technologies, etc., can solve problems such as the limitation of the number of radio frequency links, and achieve cost reduction and power consumption, small channel feedback load, and computational complexity low effect

Inactive Publication Date: 2018-07-10
SOUTHEAST UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the number of radio frequency links is limited in a large-scale millimeter-wave array communication system, and to provide a low-feedback two-stage digital-analog hybrid precoding and receiving combined transmission method to reduce system costs and power consumption, to obtain a system spectral efficiency approaching that of an all-digital signal precoding method

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  • Low-feedback precoding and reception merging combined method of large-scale antenna array system
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  • Low-feedback precoding and reception merging combined method of large-scale antenna array system

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and concrete implementation example, the present invention will be further described:

[0039] Such as figure 1 As shown, the multi-user millimeter wave array communication system includes a base station and K=4 user equipments, and the base station has M=512 antennas and N RF = 4 radio frequency links; each user equipment has P = 8 receiving antennas and 1 radio frequency link. The base station performs baseband digital precoding and radio frequency analog precoding, and the baseband digital precoding matrix and radio frequency analog precoding matrix are represented by symbols W and F respectively, where W is a 4×4 dimensional matrix and F is a 512×4 dimensional matrix. Each user equipment performs analog reception and combination processing on the received signal respectively, where the reception combination vector of user k is denoted by qk T ,k=1,2,3,4 means, among them, q k T is a 1×8-dimensional vector, k is the ...

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Abstract

The invention discloses a low-feedback precoding and reception merging combined method of a large-scale antenna array system. The method comprises the following steps that user equipment estimates wireless channel parameters including channel gains in all spreading paths and response vectors of emission and reception arrays from the user equipment to a base station; an angle of departure and an angle of arrival corresponding to the path with the maximal channel gain are captured and back fed to the base station; the base station generates the response vector of the emission array according tothe angle of departure, analog precoding is carried out on a sending signal, the base station further calculates an equivalent channel, and digital precoding is realized; and the user equipment generates the response vector of the reception array according to the angle of arrival, and analog reception merging is carried out on the reception signal. The method is applied to the practical large-scale antenna array system, digital and analog mixed signal processing is realized with low power consumption and low cost, and the spectral efficiency approaching that of a fully digital signal processing method can be realized effectively.

Description

technical field [0001] The invention relates to a low-feedback hybrid precoding and receiving combination technology in a large-scale antenna array system, and belongs to the technical field of multi-antenna array communication. Background technique [0002] Millimeter wave technology uses a large number of unlicensed frequency bands around 60GHz to achieve communication, which can effectively solve the problem of bandwidth shortage faced by future wireless cellular communications. Compared to signals in current cellular bands (3G or LTE), mmWave signals have severe path loss, penetration loss, and fading. However, the millimeter wave has a shorter wavelength, which enables more antennas to be packaged in the same physical size, and can support large-scale spatial multiplexing and highly directional beamforming, resulting in the emergence of a large-scale multiple-input multiple-output technology based on antenna array communication ( MIMO). This technology can utilize the...

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Application Information

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IPC IPC(8): H04B7/0417H04B7/0456
CPCH04B7/0417H04B7/0456Y02D30/70
Inventor 许威周少卿
Owner SOUTHEAST UNIV
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