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Scattering information source positioning method based on beam-space transformation in large-scale MIMO system

A space conversion, large-scale technology, applied in wireless communication, electrical components, etc., can solve problems such as low complexity, and achieve the effects of low complexity, reduced dimension, and less information loss

Active Publication Date: 2014-09-03
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, its computational complexity is still proportional to the cube of the number of base station antennas
[0005] Aiming at the computational complexity problem of the existing method, the present invention proposes a low-complexity scattering source location method

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  • Scattering information source positioning method based on beam-space transformation in large-scale MIMO system
  • Scattering information source positioning method based on beam-space transformation in large-scale MIMO system
  • Scattering information source positioning method based on beam-space transformation in large-scale MIMO system

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Embodiment Construction

[0023] 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.

[0024] see figure 1 , first introduce the application scenario of the method of the present invention: a communication system including a base station and multiple users, all users transmit signals to the base station within a period of time; the large-scale antenna array of the base station is a uniform cylindrical array, including L circular arrays; is the central azimuth of the kth user, is the azimuth angle expansion of the kth user, is the central pitch angle of the kth user, is the pitch angle expansion of the kth user; is the sample covariance matrix of the beam space signal vector; the signal subspace of the lth circular array is E l ,l=1,2,...,L; the transformation matrix between the signal subspace of the l′th circular array and the l′+1th circu...

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Abstract

A scattering information source positioning method based on beam-space transformation in a large-scale MIMO system comprises the following operation steps of (1) signal preprocessing stage, wherein a beam forming vector is used for transforming a received user signal vector into a vector with low dimensionality, namely the beam-space transformation, and a sample covariance matrix of the transformed vector is calculated; (2) estimation stage, wherein a signal subspace and a noise subspace are obtained through the sample covariance matrix, and the user position is estimated by the utilization of the linear relation between parts of the signal subspace and the orthogonal relation between the array manifold and the noise subspace. By the utilization of the characteristic of less information loss of the beam-space transformation of large-scale MIMO signals, the user position information is obtained after the dimensionality of the signal vector is reduced. The method can reduce the estimation complexity on the premise of improving the estimation precision of the user position information.

Description

technical field [0001] The invention relates to a method for locating scattered signal sources in massive MIMO, specifically, a method for estimating the central angle of arrival (DOA) and angle extension of scattered signal sources, belonging to the technical field of wireless communication. the Background technique [0002] In the cellular mobile communication system, the demand for data transmission is constantly increasing, and increasing the number of antennas can effectively improve the spectral efficiency of the system. Recently, it has been found that massive MIMO systems can provide extremely high spectral efficiency. In a massive multi-user MIMO system, a base station is equipped with one hundred or hundreds of antennas and serves dozens of users at the same time. When the distance between the antennas of the array is small or the angular spread of the signals is small, there is correlation between the received signals of the base station antennas. At this time,...

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Application Information

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IPC IPC(8): H04W64/00
Inventor 吕铁军胡安中
Owner BEIJING UNIV OF POSTS & TELECOMM
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