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A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Networks

A cellular network, interference alignment technology, applied in the field of communication, can solve the problems of reducing system rate, high overhead, incompatibility of single-antenna users, etc., to achieve the effect of enhancing compatibility and overcoming incompatibility

Active Publication Date: 2019-05-21
XIDIAN UNIV
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Problems solved by technology

It can be seen that this method will reduce the system speed
The second is to treat interference as noise. This method is only applicable to the case of small interference power and has certain limitations.
However, the disadvantage of this method is that all uplink users need to obtain global channel state information during interference alignment. As the number of users increases, the overhead of obtaining channel state information for interference alignment will become larger and larger.
However, the disadvantages of this method are: first, iterative interference alignment is only suitable for interference alignment of multi-antenna users, and is not compatible with single-antenna users; second, during the iteration process, all uplink users need to obtain global channel state information , if the number of users is large, the overhead of obtaining global channel state information will also increase

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  • A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Networks
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  • A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Networks

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] Refer to attached figure 1 , to further describe the specific steps for realizing the present invention.

[0053] Step 1. Select a user group.

[0054] Randomly select one uplink user from all the uplink users of the full-duplex base station cellular network, randomly select two downlink users from all the downlink users of the full-duplex base station cellular network, and combine the selected one uplink user and the two downlink users A user group.

[0055] The number of uplink and downlink antennas at the base station is both M, and the number of antennas at the uplink and downlink user terminals is also M, where M≥1, and M=1 is adopted in the embodiment of the present invention.

[0056] Step 2, the user group transmits the signal of the first time slot.

[0057] Uplink users in the user group send uplink signal s to the base station 1 .

[0058] The b...

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Abstract

A time-division interference alignment method for a full-duplex base station cellular network. The signals of the uplink and downlink users are transmitted through two time slots, and then the received signals of the downlink users of the two time slots are combined to obtain the spatial space of the downlink user signals. The dimension is twice the number of antennas. Therefore, the method of the present invention can be used for both interference alignment for multi-antenna users and interference alignment for single-antenna users. During signal transmission, the base station uses precoding to align the uplink interference to downlink users and the interference between downlink users in the same spatial dimension. Uplink users do not need to perform precoding, that is, they do not need to obtain global channel state information. The invention enhances the compatibility of interference alignment between multi-antenna users and single-antenna users, and reduces the difficulty for uplink users to obtain channel state information.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a time-division interference alignment method of a full-duplex base station cellular network. The present invention can be used in a wireless communication system in which the base station in the cellular network works in full-duplex mode, and aims at the problem that the uplink users in the full-duplex base station cellular network cause interference to the downlink users, and provides a time-division interference alignment performed at the base station method, which reduces the complexity of interference alignment. Background technique [0002] In a traditional cellular network, base stations and users work in half-duplex mode, that is, uplink users and downlink users work in different frequency bands respectively, while full-duplex base stations can realize that uplink and downlink users work in the same frequency band. SWJeon et al. have proved in the article "De...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04W72/08H04B7/06
CPCH04B7/0617H04L25/03343H04W72/541
Inventor 李帆刘祖军孙德春孙永军
Owner XIDIAN UNIV
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