In wireless relaying networks, the traditional incremental cooperative relaying\nscheme (IR) could improve the system throughput enormously over fading\nchannels by exploiting relay nodes to retransmit the source data packet to the\ndestination. In order to enhance the system throughput over time-varying\nfading channels, this paper proposes an adaptive incremental cooperative relaying\nscheme (AIR) based on adaptive modulation and coding, which implements\nadaptive rate transmission for the source and relay nodes according\nto channel state information. We derive expressions for the AIR system\nthroughput, and then give a gradient-based search algorithm to find the optimized\nadaptive solution for the AIR system by maximizing throughput subject\nto the constraint of packet error rate at the data link layer. The results indicate\nthat throughput of AIR system outperforms that of traditional IR system\ngreatly for any SNR value.
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