Selective Decode-and-Forward Using Fixed Relays and Packet Accumulation

We propose a cooperative scheme using a fixed relay based on the selective decode-and-forward (SDF) protocol. The relay accumulates Z source packets, concatenates them into a single packet, and forwards this single packet to the destination with an increased spectral efficiency. The proposed scheme can considerably outperform the conventional SDF protocol, at the cost of a moderate increased maximum delay.