Joint Power and Rate Allocation for DF Two-Path Relay Systems

In this letter, we investigate the power and rate allocation problem for decode-and-forward two-path relay systems. To deal with the inter-relay interference at the relays, two power and rate allocation schemes based on feasible power region analysis are proposed. Numerical results show that the proposed schemes can provide better power and outage performances compared with the other existing alternatives. Besides, we also discuss the performance difference between the two proposed schemes for different rate requirements. We find that the suboptimal but simpler successive-interference-cancellation-based scheme can offer near-optimal performance.