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Method for improving MIMO safety capacity based on weighting matrix

A technology of weighting matrix and security capacity, which is applied in the field of wireless communication, can solve problems such as the lack of null space in the user channel matrix, the inability to solve the precoding matrix, and the limitation of the number of antennas on both sides of the transmitter and receiver, so as to achieve the effect of improving the security capacity and being easy to implement

Inactive Publication Date: 2015-09-09
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

These classic algorithms completely eliminate multi-user interference, but they bring about the limitation of the number of antennas on both sides of the transmitter and receiver. There is no null space in the user channel matrix, which makes it impossible to solve the precoding matrix.

Method used

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  • Method for improving MIMO safety capacity based on weighting matrix
  • Method for improving MIMO safety capacity based on weighting matrix
  • Method for improving MIMO safety capacity based on weighting matrix

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] exist figure 2 In the system model of , it is assumed that the sender has N t There are K legitimate users and 1 eavesdropping user at the receiving end, and the receiving end antennas of each user are N r root. The signals received by the kth legitimate user and the eavesdropping user are respectively:

[0030] y k = H k F k x k + H k Σ j ≠ ...

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Abstract

The present invention discloses a method for improving MIMO safety capacity based on a weighting matrix. The method includes: (1) adding a weighting matrix Dk at a transmitting terminal to decrease the matrix dimensions of the system matrix such that a zero space is available; (2) calculating a precoding matrix Fk of each user at the transmitting terminal to obtain an equivalent channel matrix DkHkFk, wherein Hk represents the channel matrix of the kth user; (3) performing SVD decomposition of the equivalent channel matrix and water injection power distribution for each user; (4) adding a weighting matrix Wk at a receiving terminal, and calculating sum capacity of each user; and (5) calculating a weighting matrix We and wiretapping capacity at a wiretapping terminal, and calculating the difference between the sum capacity and the wiretapping capacity to obtain confidential capacity. According to the method, only one matrix is required to be added at the receiving end, so that the implementation is easy, and the safety capacity of the user system is greatly increased.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a weighted matrix-based MIMO (Multiple-Input Multiple-Output, multiple-input multiple-output system) security capacity improvement method. Background technique [0002] In order to adapt to the ever-evolving business requirements, both the transmitting and receiving sides of the MIMO technology use multiple antennas to make full use of multiple independent transmission channels to meet the required data rate requirements. MIMO precoding technology refers to a technology that uses the acquired channel state information to perform a certain linear or nonlinear transformation process on the transmitted signal at the transmitting end to achieve the purpose of resisting channel fading and eliminating signal interference, thereby improving system performance. . Precoding technology is one of the key technologies of MIMO technology, and the quality of precoding design is...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0413H04B7/0456Y02D30/70
Inventor 李孔泽解培中李汀
Owner NANJING UNIV OF POSTS & TELECOMM
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