Showing papers by "Hussein Al-Shatri published in 2014"
04 May 2014
TL;DR: It is shown that the proposed interference alignment based scheme achieves more degrees of freedom than the reference schemes without interference alignment.
Abstract: In this paper, multi-group multi-way relaying is considered. There are L groups with K nodes in each group. Each node wants to share d data streams with all the other nodes in its group. A single MIMO relay assists the communications. The relay does not have enough antennas to spatially separate the data streams. However, the relay assists in performing interference alignment at the receivers. In order to find the interference alignment solution, we generalize the concept of signal and channel alignment developed for the MIMO Y channel and the two-way relay channel to group signal alignment and group channel alignment. In comparison to conventional multi-group multi-way relaying schemes [1, 2], where at least R ≥ LKd − d antennas are required, in our proposed scheme, exploiting the multiple antennas at the nodes, only R ≥ LKd − Ld antennas are needed. The number of antennas required at the nodes to achieve this is also derived. It is shown that the proposed interference alignment based scheme achieves more degrees of freedom than the reference schemes without interference alignment.
6 citations
23 Oct 2014
TL;DR: The concept of external constraints is extended, which was proposed in [1] for the two-subnetwork case, and characterized, and the proper relay antenna configurations in large networks with an arbitrary number of subnetworks are characterized.
Abstract: In this paper, large partially connected wireless relay interference networks are considered. The entire network is made up of multiple disjoint groups of source-destination node pairs and relays called subnetworks. Each subnetwork is assumed to be fully connected. The different subnetworks are mutually connected by a few inter-subnetwork links. A two-hop relay-aided interference alignment scheme is applied to achieve interference-free communication in the whole network. The feasibility conditions for interference alignment in the considered networks are investigated. To this end, we extend the concept of external constraints, which was proposed in [1] for the two-subnetwork case, and characterize the proper relay antenna configurations in large networks with an arbitrary number of subnetworks.
5 citations