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

Abstract

It is a time division interference alignment method for full-duplex base station cellular network, which transmits signal of the up-link and down-link users through two time slots, and combines the receipt signal of down-link users. Space of obtained down-link signal is double of the antenna number. Therefore, the method can be used for interference alignment of both multi-antenna users and single antenna users. In the transmission process, the base station makes interference alignment of up-link to down-link users and that among down-link users in the same space. The up-link user does not need to be pre-coded, that is, it does not need to obtain the global channel state information.The invention enhances the interference alignment compatibility of multi-antenna users and the single antenna users, and reduces the difficulty of accessing the channel status information for up-link users.

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...

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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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