Multi-cell MIMO-IMAC interference alignment method based on delayed CSIT
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An interference alignment, multi-cell technology, applied in the field of communication, can solve problems such as insufficient use of antennas, low degrees of freedom, and inapplicability to MIMO-IMAC systems
Inactive Publication Date: 2020-10-30
XIDIAN UNIV
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[0006] According to the above description, although there is currently an interference alignment method for MIMO-IMAC systems, this method only considers two cells and the time slots used by users to send symbols to the base station are only divided into three stages, which is not suitable for more than two The MIMO-IMAC system of the cell, and for the MIMO-IMAC system of two cells, the system configuration conditions are limited
On the other hand, for the two-cell MIMO-IMAC system, the number of symbols sent by this method in the last time slot is small, and the user's antenna cannot be fully utilized, resulting in a low degree of freedom.
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Embodiment 1
[0043] refer to figure 1 , the implementation steps of this embodiment are as follows:
[0044] Step 1, setting multi-cell MIMO-IMAC system parameters.
[0045] Set L=2 cells, each cell has a base station with M=21 antennas, each base station serves K=3 users, each user is equipped with N=8 antennas, and the base station has global instantaneous channel state information , each user has the delayed transmitter channel state information CSIT of all users in the cell where it is located, where CSIT is delayed by one time slot.
[0046] Step 2, set the number of additional data symbols α and the number of mixed data γ.
[0047] In each time slot, the cell The K users in will send a total of M+α different data symbols, where the parameter α is the number of additional data symbols, According to the system configuration and the number of additional equations required by the cell base station be less than or equal to the maximum number of extra equations it can get The tot...
Embodiment 2
[0087] refer to figure 2 , the implementation steps of this embodiment are as follows:
[0088] Step 1, setting multi-cell MIMO-IMAC system parameters.
[0089] Set L=3 cells, each cell has a base station with M=50 antennas, each base station serves K=6 users, each user is equipped with N=9 antennas, and the base station has global instantaneous channel state information , each user has the delayed transmitter channel state information CSIT of all users in the cell where it is located, where CSIT is delayed by one time slot.
[0090] Step 2, setting the number of additional data symbols α and the number of mixed data γ.
[0091] In each time slot, the cell The K users in will send a total of M+α different data symbols, where the parameter α is the number of additional data symbols, According to the system configuration and the number of additional equations required by the cell base station be less than or equal to the maximum number of extra equations it can get Th...
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Abstract
The invention provides a multi-cell MIMO-IMAC interference alignment method based on delayed CSIT, and mainly solves the problems of insufficient application scenarios and low degree of freedom in theprior art. According to the technical schemes of the invention, the method comprises the following steps that: system parameters are set; a user selects a specific sending strategy to send a signal vector to a base station according to the system parameters, and sets a time slot expansion multiple; a cell user sends the signal vector to a base station, and selects a user of a specific cell in each stage except the last stage so as to send a signal to the user; two different cells are selected in each super time slot of the last stage, so that a signal vector designed based on the delayed CSITis sent to a base station; the base stations eliminate interference and obtain the received interference-free signal vector, and interference alignment is realized. The application scene of a systemis expanded, the degree of freedom of the system under specific configuration is improved; and the method can be used for realizing interference management in MIMO-IMAC systems of two or more cells.
Description
technical field [0001] The invention belongs to the technical field of communications, and in particular relates to an interference alignment method, which can be used to realize interference management in MIMO-IMAC systems of two or more cell MIMO-IMAC systems. Background technique [0002] In recent years, with the rapid development of wireless communication technology and the upgrading of smart devices, users' demands for communication services are becoming more and more diversified, and the required transmission rate is getting higher and higher. In order to improve the service quality of wireless communication systems, MIMO technology has been widely used in modern wireless communication systems. However, the interference between multiple cells and multiple users greatly limits the effect of MIMO technology. Therefore, more advanced interference management technology has become a major research hotspot in the field of wireless communication. [0003] Interference manag...
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