OFDMA Based Cooperative Relay Networks

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The authors evaluate the performance improvement in Orthogonal Frequency-Division Multiplex Access (OFDMA) achievable with cooperative relaying in the presence of frequency offsets. The relays can operate in either the Amplify-and-Forward (AF) or Decode-and-Forward (DF) mode. In each transmission, node S has M relays when transmitting its own signal and it also helps the other M relays transmit their signals. The total power used to transmit each symbol, including the power consumed in S and the relays, is kept constant.