Alinhamento de Interferência em Redes MIMO Multicast

Abstract

The evolution of mobile technology has expanded considerably in recent years and the access to these technologies has become popularized mainly with smartphones and notebooks. These devices allowed access to multimedia content and the cloud in a very dynamic and effective way, and with that the use of internet and data in the mobile network took a big leap. Given the increase in the number of elements communicating in the network, the interference in this system has become a problem to be carefully addressed so that bandwidth efficiency can be maximized, so that the ability to accept the demand for new connections with a good data transfer rate is achieved. To meet the need for the large traffic generated by these new devices inserted into the system, new interference mitigation techniques have been proposed, and a very promising technique is to align the interference generated on the transmitters so that the unwanted receivers are not negatively affected by the interfering signals and can detect their useful signal. This dissertation considers an interfering MIMO (Multiple-Input Multiple-Output) multicast channel, in which each transmitter wants to send a signal to a group of receivers, causing interference between different cells. This scenario corresponds to a more general case than the traditional MIMO interfering channel. In this work, an analysis of the feasibility conditions is performed so that the interference alignment can be realized, considering different scenarios with variations in the numbers of receivers, transmitters, groups and antennas.