Nonlinear block multi-diagonalization precoding for high SHF wide-band massive MIMO in 5G

Performance Evaluation of NL-BMD Precoding over Analog-Digital Hybrid Beamforming for High SHF Wide-Band Massive MIMO in 5G

“…In NLP, user hierarchization is mandatory for practical IUI-PC. When BT computation is applied onto the system channel matrix H, the obtained unitary matrix B bt enables us to successively pre-cancel IUI [19] (see Appendix in [17]). Using the system precoding matrix B bt yielding BT, we can obtain the effective system channel matrix as…”

“…Unfortunately, for the desired user #i, IUI-PC utilized together with BT needs removal of IUI signals from all the upper-layer users #1, Á Á Á, #ði À 1Þ, resulting in higher computational load in proportion to the number of users N usr . In NL-BT, the order of numerical complexity in IUI-PC is O N 2 usr À Á [17]. When applying IUI-PC, implementation of modulo operation can significantly reduce TX power while reasonably maintaining spectral efficiency performance [17].…”

“…In NL-BT, the order of numerical complexity in IUI-PC is O N 2 usr À Á [17]. When applying IUI-PC, implementation of modulo operation can significantly reduce TX power while reasonably maintaining spectral efficiency performance [17]. So, modulo operation is important for practical use of IUI-PC.…”

“…Based on these studies, in [17], nonlinear block multidiagonalization (NL-BMD) precoding has been proposed as an intermediate precoding approach between BD and NL-BT. It is composed of BMD [18] and adjacent IUI-PC.…”

“…Therefore NL-BMD precoding offers advantages in numerical complexity in IUI-PC. It has been reported in [17] that, NL-BMD provides higher throughput over BD with reasonable complexity less than NL-BT, through numerical evaluation assuming narrow-band single-carrier transmission and Rician fading.…”