Efficient frequency reuse scheme in cooperative relaying for multi-cell OFDMA systems

Cooperative communication has recently gained a lot of interest for the next generation cellular network. This paper addresses the co-channel cell interference (CCI) mitigation techniques in the downlink cooperative relaying for multi-cell OFDMA systems with 19-cell structure. It divides each cell into two regions: the central region and the edge region. The frequency reuse factor (FRF) is set to 1 in the central region and 3 in the edge region. A relay station (RS) which amplifies and forwards the received signal to the mobile, is placed at the limit of the two regions. Numerical results show that the proposed cooperative scheme provides a significant performance gain over the strategy without relay and can be considered as a powerful solution for CCI avoidance in the edge of the cell.