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- Title
A low-complexity transmit combining method for downlink of massive multiuser multiple input multiple output systems.
- Authors
Dabetic, Rade P.; Markovic, Goran B.
- Abstract
Multiuser multiple input multiple output (MU-MIMO) systems can provide high spectral efficiency (SE) that is achieved with transmit/receive combining schemes at the base station (BS) for downlink (DL) and uplink (UL). So far, various combining schemes for DL were proposed, with the regularized zero forcing (RZF) and Tomlinson– Harashima precoding (THP) being usually considered. In a case of massive MU-MIMO systems, with a large number of antennas, the matrix inversion operation used in the RZF and THP schemes causes high computational complexity that significantly aggravates implementation and raises its costs. The authors propose a low-complexity transmit combining scheme for the massive MU-MIMO systems with time division duplex (TDD), devised in a similar manner as the THP scheme, based on the gram-Schmidt orthogonalization, and show that it achieves slightly better SE than the THP scheme for the estimated channel state information (CSI), but with a much lower complexity than the THP and RZF schemes.
- Subjects
MIMO systems; MATRIX inversion; ANTENNAS (Electronics); COMPUTATIONAL complexity; ORTHOGONALIZATION; MULTIPLE access protocols (Computer network protocols); MULTIUSER computer systems
- Publication
Electronics Letters (Wiley-Blackwell), 2023, Vol 59, Issue 10, p1
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/ell2.12771