Relaying with finite blocklength: Challenge vs. opportunity

In this paper, we study the performance of a system with multiple decode-and-forward (DF) relays under the finite blocklength (FBL) regime. We derive the FBL-Throughput under both perfect CSI and average CSI scenarios while the corresponding throughputs under an infinite blocklength assumption (IBL-throughput) are discussed as performance references. Through numerical analysis, we evaluate the system performance. We show a higher throughput under the FBL assumption than under the IBL assumption under the perfect CSI scenario.