Capacity Analysis of MIMO-OFDMA based Cellular Relay Networks

The flexibility in relay networks and Orthogonal Frequency-Division Multiple Access (OFDMA) make the combination a suitable candidate network and air-interface technology for providing reliable and ubiquitous high-data-rate coverage in next-generation cellular networks. The Multiple-Input Multiple-Output based Orthogonal Frequency-Division Multiple Access (MIMO-OFDMA) is a promising high rate air interface technology. It is well known that the capacity and coverage of a system can be significantly enhanced by employing a proper resource allocation (RA) scheme. In this paper, we propose an efficient proportional fair (PF) allocation algorithm for MIMO-OFDMA based cellular relay networks. This proposed algorithm provides a flexible subcarrier allocation in order to maximize the system capacity of the MIMO system. The proposed PF allocation algorithm is also used to improve the system capacity of the higher orders of the MIMOOFDMA based cellular relay networks. Numerical results show that, the proposed algorithm significantly improves the system capacity of the MIMO-OFDMA based cellular relay networks.