Optimized Incremental Selection Hybrid Decode-Amplify-Forward Relaying Cooperation for Average Transmission Power Reduction

To improve the spatial diversity gain and reduce the average transmission power in cooperative communications, a power-optimized channel status information (CSI) aware incremental selection hybrid decode-amplify-forward (ISHDAF) scheme with destination scheduling is proposed. In the optimized scheme, three cooperative modes of amplify-forward (AF), decode-forward (DF), and source retransmission are combined to increase the diversity gain. In addition, it reduces the average transmission power by lifting the probability of using lower-power relay cooperation. Simulation results show that the proposed scheme obtains a total power gain of 0.8w at outage probability of 10−1 when compared with that of the existing incremental selection decode-forward (ISDF) scheme. Under the same performance, when the relay distance factor ratio is 0.9 and the total system power is 10w, the proposed scheme after power allocation outperforms the traditional ISHDAF scheme by about 1w average transmission power.