Power Allocation for Orthogonal Multiple Access Relay Channel Allowing Intra-link Errors

Power and rate allocation is theoretically analyzed for an orthogonal multiple-access relay channel (MARC), where lossy transmissions are allowed in the source-relay links and the erroneous estimates are forwarded from the relay to the destination. Conventional decode-and-forward (DF) strategy forwards only correctly received estimates and discards the erroneous. However, even the erroneous estimates can be utilized at the destination in order to improve the reliability of the received information sequences sent from source nodes. In this paper, minimum power and maximum rate problems for the MARC system with lossy relaying are formulated and the resulting nonconvex problems are solved via successive convex approximation (SCA). Numerical results show that the system allowing erroneous relaying is superior in terms of the considered objectives compared to the lossless DF.