Figure 7From: Sum rate maximization for multi-cell downlink OFDMA with subcarrier pair-based opportunistic DF relayingRA results for P2 and P4 when P t =30 dBmW. The blue squares and the red crosses indicate P2 and P4, respectively. (a) Sum rate comparison. (b) Mode selection. (c) Subcarrier allocation at TS1. (d) Subcarrier allocation at TS2. (e) Power allocation for the source at TS1. (f) Power allocation for the source at TS2. (g) Power allocation for the relay.Back to article page