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The QR decomposition (QRD) is an important prerequisite for many different detection algorithms in multipleinput multiple-output (MIMO) wireless communication systems. This paper presents an optimized fixed-point VLSI implementation of the modified Gram-Schmidt (MGS) QRD algorithm that incorporates regularization and additional sorting of the MIMO channel matrix. Integrated in 0.18 µm CMOS technology, the proposed VLSI architecture processes up to 1.56 million complexvalued 4×4-dimensionaldoi:10.1109/apccas.2008.4746151 dblp:conf/apccas/LuethiSDZKFF08 fatcat:jmyxujs46ndyzow7t4h347xqia