A Study of Trade-Off Between Opportunistic Resource Allocation and Interference Alignment in Femtocell Scenarios
Source: Aalborg University
One of the main problems in wireless heterogeneous networks is interference between macro- and femto-cells. Using Orthogonal Frequency-Division Multiple Access (OFDMA) to create multiple frequency orthogonal sub-channels, this interference can be completely avoided if each sub-channel is exclusively used by either macro- or a femto-cell. However, such an orthogonal allocation may be inefficient. They consider two alternative strategies for interference management, Opportunistic Resource Allocation (ORA) and Interference Alignment (IA). Both of them utilize the fading fluctuations across frequency channels in different ways.