An Efficient Multiuser Relaying Scheme for OFDMA Systems

This paper proposes an efficient multiuser relaying scheme in OFDMA systems. In the proposed scheme, multiple terminals transmit packets simultaneously in the same subband and multiple relay stations retransmit their received signals in different subbands after subband conversion. The base station (BS) extracts each packet from multi-dimensional signals received at the different subbands. In advance of data transmission, the BS's scheduler selects appropriate terminals for packet transmission such that the BS can detect each packet correctly. Numerical results show that the proposed relaying scheme achieves much higher system throughput than the conventional relaying scheme.