Figure 1From: Distributed algorithms for sum rate maximization in multi-cell downlink OFDMA with opportunistic DF relayingIllustration of a relay-aided transmission in cell n with cochannel interference from cell n′. The solid lines and the dashed lines represent communication links and interfering links, respectively. (a) At subcarrier k and the first TS. (b) At subcarrier l and the second TS.Back to article page