Power Allocation for Buffer-Aided Full-Duplex Relaying With Imperfect Self-Interference Cancelation and Statistical Delay Constraint

摘要: This paper considers source and relay power allocation for buffer-aided full-duplex (B-FD) relaying network, assuming constant data rate arrivals at the buffer. Statistical delay constraint is imposed, where end-to-end queue length allowed to exceed a pre-defined queue-length threshold with maximum acceptable queue-length-outage probability. We assume imperfect self-interference (SI) cancelation, non-zero residual SI modeled be proportional transmit power. investigate two problems arrival maximization: 1) B-FD adaptive (B-FD-APA) when instantaneous channel state information transmitters (CSIT) available 2) static (B-FD-SPA) only statistical CSIT available. To solve problems, we first employ asymptotic analysis transform into more tractable constraints. Then, optimal solutions are derived using Lagrangian approach. In addition, various special cases of presented. With B-FD-APA, can opportunistically switch between half-duplex (HD) FD operation modes according conditions. B-FD-SPA, always employs mode. Numerical results performed compare capacities proposed B-FD, non-buffer FD, HD schemes, as well direct transmission (DT) under settings, demonstrating effectiveness support delay-constrained communications.