An Efficient FRS-Cooperative Strategy with No CSIT in OFDM-Based Networks

In conventional cellular systems with a frequency reuse factor (FRF) of one, quality of service (QoS) may not be guaranteed for users located at the cell boundary due to inter cell interference (ICI). Even if relay nodes are adopted for cooperative communications, ICI and inter-relay interference (IRI) remain significant obstacles to reliable data transmission at the border region of each cell. This paper presents an efficient fixed relay station (FRS)-cooperative strategy termed interference cancelation based FRS-cooperation (ICFC) to improve the QoS. The proposed scheme enables to improve the performances of two users at cell-edge in each cell through cooperation and interference cancelation, simultaneously. In particular, the ICFC scheme is well applicable to practical systems because no CSIT is required.