Figure 1
From: Diversity-multiplexing tradeoff analysis and optimization for OFDM-based multihop relaying systems
(a) Block diagram of the wireless multihop OFDM-based relaying system with one source node, one destination node and T-1 relay nodes. (b) The transmit architecture at S employing subcarrier grouping and linear precoding. (c) The receive architecture at D employing linear detection.