HARQ Throughput Enhancement Using Maximum Likelihood Block Detection With Recursive QR Packet Combining and M-Algorithm for Single-Carrier MIMO

For achieving very high-speed and high quality packet transmission, the joint use of Multi-Input Multi-Output (MIMO) spatial multiplexing and Hybrid Automatic Repeat reQuest (HARQ) is very effective. The HARQ throughput depends on the packet combining scheme. In this paper, the authors consider a Single-Carrier (SC) MIMO and propose a maximum likelihood block detection using recursive QR packet combing and M-algorithm called recursive QRM-MLBD. They will show, by computer simulation, the recursive QR packet combing provides a better throughput performance than the conventional bit-level log LikeLihood Ratio (LLR) packet combining.