Multi-stream diversity BD precoding method and device for self-interference suppression

A precoding and self-interference technology, applied in the field of multi-stream diversity BD precoding with self-interference suppression, can solve problems such as poor bit error rate performance, eliminate inter-user interference, improve system reliability, and eliminate inter-antenna self-interference Effect

Active Publication Date: 2020-02-07
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a self-interference suppressed multiplexer with better system bit error rate performance in view of the problem that the BD precoding method in the prior art has poor bit error rate performance when multiple data streams are sent. Stream diversity BD precoding method and device

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  • Multi-stream diversity BD precoding method and device for self-interference suppression

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Embodiment 1

[0031] The precoding in the existing MU-MIMO system mainly falls into two categories: nonlinear precoding and linear precoding. Among them, nonlinear precoding can provide better system performance, but its application range is limited due to its high implementation complexity. Compared with nonlinear precoding, linear precoding is widely used, such as BD precoding, because of its lower complexity and slightly worse performance. However, block diagonal BD precoding only eliminates the interference between multiple users, and does not consider the self-interference between antennas. When users have multiple data streams, the bit error rate performance decreases. The present invention conducts research and innovation on this problem, and proposes a multi-stream diversity BD precoding method with self-interference suppression. When constructing an interference matrix, the self-channel state information is introduced, and self-interference between antennas is suppressed while elim...

Embodiment 2

[0059] The multi-stream diversity BD precoding method with self-interference suppression is the same as that in Embodiment 1, wherein the zero-space orthogonal basis of the user receiving antenna is determined in step 2, specifically including:

[0060] 2.1: Construct the interference matrix of the i-th receiving antenna of any user k The matrix includes not only channel state information of other users, but also own channel state information.

[0061] 2.2: Solve the null space orthogonal basis of the interference matrix of the i-th receiving antenna of user k, for Perform singular value decomposition to get in yes The left singular vector matrix of , yes The singular value matrix of , yes matrix of right singular vectors, is the right singular vector matrix corresponding to the nonzero singular values, is the right singular vector matrix corresponding to zero singular value, which can be known from the knowledge of matrix theory, constitute The null-sp...

Embodiment 3

[0066] The present invention is also a multi-stream diversity BD precoding device with self-interference suppression, see image 3 , connected in sequence according to the signal processing flow: channel matrix acquisition module, zero-space orthogonal basis construction module, precoding matrix and receiving decoding matrix construction module, precoding processing module, and receiving signal processing module. Each module is described as follows:

[0067] The channel matrix obtaining module is used to obtain the channel matrix of all users, the input is the channel matrix of each user, and the output is the channel matrix of all users. For the time division duplex system, the user channel matrix is ​​obtained from the uplink training sequence or pilot sequence received by the base station; for the frequency division duplex system, the user channel matrix is ​​obtained through feedback.

[0068] The null-space orthogonal basis construction module is used to obtain the null-s...

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Abstract

The invention provides a self-interference suppression multi-stream diversity BD precoding method and device. The method comprises the steps that a base station acquires all user channel matrixes; the interference matrix of each user receiving antenna is determined to construct the zero space orthogonal basis of all receiving antennas of users; the self-interference suppression equivalent channel matrix of each user is constructed, and then the multi-stream diversity BD precoding and receiving decoding matrix of each user is constructed; multi-stream diversity BD precoding is carried out on original signals sent by a base station to each user, and added signals are transmitted from the base station; users process the received signals through a corresponding received decoding matrix; and data streams received by each user are merged, and original transmission data of the user are estimated. According to the invention, the technical problem of self-interference between receiving end antennas in a MU-MIMO system is solved; multi-user interference is eliminated; self-interference of an equivalent channel is suppressed; multiple data streams are merged to increase the spatial diversity gain; the reliability is improved; and the method and device are used for anti-interference in the field of wireless communication.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and in particular relates to a precoding in the downlink of a multi-user multiple-input multiple-output (referred to as MU-MIMO) system, in particular to a self-interference suppression multi-stream diversity BD precoding method and device , for anti-jamming in the field of wireless communication. Background technique [0002] The MU-MIMIO system can send multiple spatial multiplexing signals to multiple users on the same time and frequency resource block, and at the same time obtain the benefits of high system capacity and SDMA processing to offset multi-user interference. In this system, since the base station (referred to as BS) sends signals to multiple users at the same time, it will inevitably introduce multi-user interference (referred to as MUI), and because the receiving antennas belong to different users, the users cannot perform cooperative processing, so it is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0452H04B7/0456H04B1/7103
CPCH04B1/7103H04B7/0452H04B7/0456
Inventor 王杰令王敏周斌王棚
Owner XIDIAN UNIV
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