太赫兹大规模MIMO中两层延时器的混合预编码

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中图分类号：TN929.55 文献标志码：A文章编号：1003-3114（2025）06-1287-10

Abstract：Thispaperaddressesthedeclineinperformanceof raditionalphaseshifterprecodingduetobeamsplitingineraertz communications，aswellastehighhardwarecomplexityasociatedwiththecurentTrue TimeDelay（TTD）architecturedesignedto ddresseamspliting.Toaddressteseissues，ahbridanaloprecodingarchitectureispropoedforterahertzmasiveuliple-Input Multiple-Output（MIMO）systems，incorporating two-layerTDand phase shifters.Thisarchitectureaims toreducethenumberof high-bitTTDrequired.Underthepremiseofunknownbeamangle，theOrthogonal MatchingPursuit（OMP）algorithmfornarrowband systemsisimproedtoatchthequivalentbeamanglesacrossdiferentsubariersCosequentlyaMulti-CarierOrtogonalatc hingPursuit（MC-OMP）algoritisdeveloped.Thisalgorithmdesignsthedelaymatricesforthetwo-layerTDbymaximizingthearraygainofeachsubcarier，enablingteconstructionofcanddateaalogprecodingmatricesforachsubcarier.hen，itsacsfor theoptimalbamaglescoesponingtecanidatematricsylveragingteaxcorrelationprojectioofeesialatr andcanddatematricesarossallsubcarrirsTisultiatelyladstoheconstructioofhybridprecodingmatricesforallsubae. Simulation results indicate thatcompared to the single-layer TTDarchitecture，theuseof high-bit TTD is reduced by 50% in the twolayerTDarchitecture.Furthermore，teproposedalgorithsigficantlyoutperfos taditionalalgorithsandimprovestheachievable sum rate of the system by 3.34% compared to the Delay Phase Precoding （DPP） algorithm with known beam angle.Therefore，the solutionpresentedinthispaperefectivelyenhancestheachievablesumrateofthesystemandenergyeficiencyunderbeamspliting effects while reducing hardware complexity.

Keywords：terahertz；massive MIMO；beam splitting;hybrid precoding; two-layer true time del：

0 引言

支持超高速传输速率的太赫兹 （0.1～10THz ）技术是未来6G无线通信的关键候选技术之—[1-2]然而，太赫兹信号的超高频特性容易导致严重的路径损耗，无法实现远距离传输。（剩余13111字）