针对串行抵消列表(Successive Cancellation List,SCL)译码框架下基于搜索集的路径分裂选择策略的缺陷,提出两种改进策略:基于可靠性函数的路径分裂策略和依靠辅助路径度量值(Auxiliary Path Metric,APM)的剪枝策略。在此基础上,提出一...针对串行抵消列表(Successive Cancellation List,SCL)译码框架下基于搜索集的路径分裂选择策略的缺陷,提出两种改进策略:基于可靠性函数的路径分裂策略和依靠辅助路径度量值(Auxiliary Path Metric,APM)的剪枝策略。在此基础上,提出一种新的译码算法——基于可靠性函数的路径分裂选择策略辅助串行抵消列表(Path Splitting Selecting Strategy Based on Reliability Function under the Successive Cancellation List,PSS-RF-SCL)译码算法。该算法在译码阶段,每个信息比特在进行路径分裂前,会计算所有路径的路径度量(Path Metric,PM)值。利用这些PM值,进一步计算该比特的可靠性函数值。算法将可靠性函数值低于其平均值(即阈值α)的信息比特视为需要进行路径分裂的比特,从而减少了多余的路径分裂次数。此外,算法计算每条路径的APM值,并将APM值高于正确译码路径的APM平均值(即阈值β)的路径视为不可靠路径,对不可靠路径进行剪枝,有效控制了译码列表总数。仿真结果表明,相较于传统的基于搜索集的路径分裂策略辅助的SCL译码算法,所提出的PSS-RF-SCL译码算法在保持相同译码性能的前提条件下,显著降低了译码复杂度。展开更多
远距离大容量输电,造成系统阻尼降低和输电能力下降,甚至可能发生低频振荡。PSS(电力系统静态稳定器,Power System Stabilizer)是抑制低频振荡最经济最有效手段,但PSS性能与其参数直接相关,良好的PSS参数能产生理想的附加阻尼,不仅快速...远距离大容量输电,造成系统阻尼降低和输电能力下降,甚至可能发生低频振荡。PSS(电力系统静态稳定器,Power System Stabilizer)是抑制低频振荡最经济最有效手段,但PSS性能与其参数直接相关,良好的PSS参数能产生理想的附加阻尼,不仅快速抑制低频振荡,而且提高系统的动态阻尼和输电能力。本文建立了两个PSS参数的优化模型,首次采用了改进型约束变尺度最优化算法,大大提高了收敛速度和收敛稳定性;采用了Fortran和Visual Basic混合编程技术,提高了计算速度和软件界面直观性;整定PSS参数时,可以比较两组优化参数,实现最佳整定。展开更多
In a 5G mobile communication system,cell search is the initial step in establishing downlink synchronization between user equipment(UE)and base stations(BS).Primary synchronization signal(PSS)detection is a crucial pa...In a 5G mobile communication system,cell search is the initial step in establishing downlink synchronization between user equipment(UE)and base stations(BS).Primary synchronization signal(PSS)detection is a crucial part of this process,and enhancing PSS detection speed can reduce communication latency and improve overall quality.This paper proposes a fast PSS detection algorithm based on the correlation characteristics of PSS time-domain superposition signals.Conducting PSS signal correlation within a smaller range can reduce computational complexity and accelerates communication speed.Additionally,frequency offset can impact the accuracy of calculations during the PSS detection process.To address this issue,we propose applying convolutional neural networks(CNN)for frequency offset estimation of synchronization signals.By compensating for the frequency of related signals,the accuracy of PSS detection is improved.Finally,the analysis and simulation results demonstrate the effectiveness of the proposed approach.展开更多
Flexible electrochromic devices(FECDs)demonstrate significant potential for applications in wearable elec-tronics,military camouflage,and flexible smart displays.As a crucial electrochromic material,poly(3,4-ethylened...Flexible electrochromic devices(FECDs)demonstrate significant potential for applications in wearable elec-tronics,military camouflage,and flexible smart displays.As a crucial electrochromic material,poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)is widely used in FECDs due to its excellent mechanical flexibility,tunable conductivity,and non-toxicity.However,the manufacturing process for patterned PEDOT:PSS electrochromic devices remains intricate,costly,and challenging to personalize.To address this challenge,we have developed a 3D-printable ink with controllable rheological properties through a concentration-tuning strategy,enabling programmable,patterned printing of PEDOT-based conductive polymer electrochromic layers.The 3D-printed FECDs exhibit outstanding electrochromic performance,including a high optical contrast(up to 47.9%at 635 nm),fast response times(t_(c)=1.6 s;t_(b)=0.6 s),high coloration efficiency(352 cm^(2) C^(-1)),and good cycling stability(with only a 9.3%decrease in optical contrast after 100 electrochemical cycles).Finally,we utilize 3D printing technology to construct flexible,patterned PEDOT:PSS electrochromic devices with bespoke butterfly designs.This work establishes the theoretical foundation for the application of 3D printing technology in PEDOT:PSS flexible electrochromic devices.展开更多
文摘针对串行抵消列表(Successive Cancellation List,SCL)译码框架下基于搜索集的路径分裂选择策略的缺陷,提出两种改进策略:基于可靠性函数的路径分裂策略和依靠辅助路径度量值(Auxiliary Path Metric,APM)的剪枝策略。在此基础上,提出一种新的译码算法——基于可靠性函数的路径分裂选择策略辅助串行抵消列表(Path Splitting Selecting Strategy Based on Reliability Function under the Successive Cancellation List,PSS-RF-SCL)译码算法。该算法在译码阶段,每个信息比特在进行路径分裂前,会计算所有路径的路径度量(Path Metric,PM)值。利用这些PM值,进一步计算该比特的可靠性函数值。算法将可靠性函数值低于其平均值(即阈值α)的信息比特视为需要进行路径分裂的比特,从而减少了多余的路径分裂次数。此外,算法计算每条路径的APM值,并将APM值高于正确译码路径的APM平均值(即阈值β)的路径视为不可靠路径,对不可靠路径进行剪枝,有效控制了译码列表总数。仿真结果表明,相较于传统的基于搜索集的路径分裂策略辅助的SCL译码算法,所提出的PSS-RF-SCL译码算法在保持相同译码性能的前提条件下,显著降低了译码复杂度。
文摘远距离大容量输电,造成系统阻尼降低和输电能力下降,甚至可能发生低频振荡。PSS(电力系统静态稳定器,Power System Stabilizer)是抑制低频振荡最经济最有效手段,但PSS性能与其参数直接相关,良好的PSS参数能产生理想的附加阻尼,不仅快速抑制低频振荡,而且提高系统的动态阻尼和输电能力。本文建立了两个PSS参数的优化模型,首次采用了改进型约束变尺度最优化算法,大大提高了收敛速度和收敛稳定性;采用了Fortran和Visual Basic混合编程技术,提高了计算速度和软件界面直观性;整定PSS参数时,可以比较两组优化参数,实现最佳整定。
文摘In a 5G mobile communication system,cell search is the initial step in establishing downlink synchronization between user equipment(UE)and base stations(BS).Primary synchronization signal(PSS)detection is a crucial part of this process,and enhancing PSS detection speed can reduce communication latency and improve overall quality.This paper proposes a fast PSS detection algorithm based on the correlation characteristics of PSS time-domain superposition signals.Conducting PSS signal correlation within a smaller range can reduce computational complexity and accelerates communication speed.Additionally,frequency offset can impact the accuracy of calculations during the PSS detection process.To address this issue,we propose applying convolutional neural networks(CNN)for frequency offset estimation of synchronization signals.By compensating for the frequency of related signals,the accuracy of PSS detection is improved.Finally,the analysis and simulation results demonstrate the effectiveness of the proposed approach.
基金supported by the Natural Science Foundation of Jiangxi Province(20232ACB204002&20232BAB202044)Jiangxi Provincial Key Laboratory of Flexible Electronics(20212BCD42004&20242BCC32010).
文摘Flexible electrochromic devices(FECDs)demonstrate significant potential for applications in wearable elec-tronics,military camouflage,and flexible smart displays.As a crucial electrochromic material,poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)is widely used in FECDs due to its excellent mechanical flexibility,tunable conductivity,and non-toxicity.However,the manufacturing process for patterned PEDOT:PSS electrochromic devices remains intricate,costly,and challenging to personalize.To address this challenge,we have developed a 3D-printable ink with controllable rheological properties through a concentration-tuning strategy,enabling programmable,patterned printing of PEDOT-based conductive polymer electrochromic layers.The 3D-printed FECDs exhibit outstanding electrochromic performance,including a high optical contrast(up to 47.9%at 635 nm),fast response times(t_(c)=1.6 s;t_(b)=0.6 s),high coloration efficiency(352 cm^(2) C^(-1)),and good cycling stability(with only a 9.3%decrease in optical contrast after 100 electrochemical cycles).Finally,we utilize 3D printing technology to construct flexible,patterned PEDOT:PSS electrochromic devices with bespoke butterfly designs.This work establishes the theoretical foundation for the application of 3D printing technology in PEDOT:PSS flexible electrochromic devices.
