IMPROVED OFDMA UPLINK TRANSMISSION VIA COOPERATIVE RELAYING IN THE PRESENCE OF FREQUENCY OFFSETS—PART II: OUTAGE INFORMATION RATE ANALYSIS

n Part I of this paper, the ergodic information rate is derived for an orthogonal frequency-division multiplexing access (OFDMA) uplink with cooperative relaying in the presence of frequency offsets. In this part, the outage information rate of the system is analysed. Both amplify-and-forward (AF) and decode-and-forward (DF) relays are considered. Each node can play the roles of the source node and the relay, simultaneously, at different subcarriers. Both the outage information rate and the diversity gain are derived for the interference-limited environment. Numerical results illustrate the superior performance of the proposed cooperative scheme over conventional transmission (without relaying) with regard to outage information rate