Seyyed Hassan Mahboubi
Interference Management in a Class of Multi User Networks
Spectrum sharing is known as a key solution to accommodate the increasing number of users and the growing demand for throughput in wireless networks. Interference is the primary barrier to enhance the overall throughput of the network, especially in the medium and high SNRs. Managing interference to overcome this barrier has emerged as a crucial step in developing efficient wireless networks.
An interference management strategy, named as Interference Alignment is investigated. It was shown that a single strategy is not able to achieve the maximum throughput in all possible scenarios and in fact a careful design is required to fully exploit all available resources in each realization of the system.
In this dissertation, the impact of the interference on the capacity of X-channel networks with multiple antennas is investigated. We use the Degrees of Freedom as a figure of merit to evaluate the performance improvement due to the interference management schemes. A new Alignment technique, enjoying the both benefits of its ancestors is introduced, named Layered Interference Alignment, using a firstly introduced by author type of Diophantine Approximation theorems, is deployed and proved to enable the possibility of joint decoding among the antennas of a receiver along with a transmitter design which characterizes the total DOF of MIMO X channels. Then this results is used to characterize the DoF of the two families of MIMO X channels, it is also extended to be used for complex channel realizations.