为满足卫星通信中双频共口径、高集成、多波束等要求,提出了一种基于封装天线(Antenna in Package, AIP)架构的Ka频段收发共口径多波束相控阵天线。天线以双频堆叠微带单元的形式实现了收发共口径,并通过天线集成滤波器保证了收发通道...为满足卫星通信中双频共口径、高集成、多波束等要求,提出了一种基于封装天线(Antenna in Package, AIP)架构的Ka频段收发共口径多波束相控阵天线。天线以双频堆叠微带单元的形式实现了收发共口径,并通过天线集成滤波器保证了收发通道的隔离度优于44 dB。在±60°范围内,64元接收阵增益优于17.4 dB,128元发射阵增益优于20.2 dB,具有良好的波束扫描性能。为获得收发多波束一片式集成,在收发(Transmitter/Receiver, T/R)组件中使用晶圆级三维系统集成封装(Three Dimensions System in Package, 3D-SIP)并结合微凸点的制备技术,保证了系统级芯片(System-on-Chip, SOC)的高密度二次集成。高低频混压技术同样被应用于阵面、收发网络、控制供电链路的多层板集成。所提多波束的相控阵天线新架构具有高密度集成TR组件、多波束一体化、高效散热等特点,在卫星通信和数据链等方面具有广阔的应用前景。展开更多
无线移动通信网络频谱共享即不同制式无线网络共享频谱分配,实现无线频谱的高效利用。对于长期演进LTE(Long Term Evolution, LTE)与全球移动通信系统GSM(Global System for Mobile Communications, GSM)网络的频带共享过程中,GSM会对LT...无线移动通信网络频谱共享即不同制式无线网络共享频谱分配,实现无线频谱的高效利用。对于长期演进LTE(Long Term Evolution, LTE)与全球移动通信系统GSM(Global System for Mobile Communications, GSM)网络的频带共享过程中,GSM会对LTE造成干扰,影响LTE的通信质量,尤其是对LTE下行控制信道物理下行控制信道PDCCH(Physical Downlink Control Channel, PDCCH)的影响。由于PDCCH信道映射的特殊性,使得其无法完全避免干扰对它的影响。鉴于此,文章提出一种适用于第四代移动通信技术4G(The 4^(th) Generation of Mobile Communication Technology Standards, 4G)频带共享网络的PDCCH调度、功率调整方法。其核心思想是:通过共享频带的模型,决定PDCCH调度策略,同时,评估异网络对PDCCH的影响,从而调整PDCCH的功率。保证了控制信道的传输性能,从而完成了高效的、可靠的频谱共享网络通信。展开更多
Cognitive radio（CR） technology is considered to be an effective solution to allocate spectrum resources,whereas the primary users of a network do not fully utilize available frequency bands.Spectrum auction framewor...Cognitive radio（CR） technology is considered to be an effective solution to allocate spectrum resources,whereas the primary users of a network do not fully utilize available frequency bands.Spectrum auction framework has been recognized as an effective way to achieve dynamic spectrum access.From the perspective of spectrum auction,multi-band multi-user auction provides a new challenge for spectrum management.This paper proposes an auction framework based on location information for multi-band multi-user spectrum allocation.The performance of the proposed framework is compared with that of traditional auction framework based on a binary interference model as a benchmark.Simulation results show that primary users will obtain more total system revenue by selling their idle frequency bands to secondary users and the spectrum utilization of the proposed framework is more effective and fairer.展开更多
文摘为满足卫星通信中双频共口径、高集成、多波束等要求,提出了一种基于封装天线(Antenna in Package, AIP)架构的Ka频段收发共口径多波束相控阵天线。天线以双频堆叠微带单元的形式实现了收发共口径,并通过天线集成滤波器保证了收发通道的隔离度优于44 dB。在±60°范围内,64元接收阵增益优于17.4 dB,128元发射阵增益优于20.2 dB,具有良好的波束扫描性能。为获得收发多波束一片式集成,在收发(Transmitter/Receiver, T/R)组件中使用晶圆级三维系统集成封装(Three Dimensions System in Package, 3D-SIP)并结合微凸点的制备技术,保证了系统级芯片(System-on-Chip, SOC)的高密度二次集成。高低频混压技术同样被应用于阵面、收发网络、控制供电链路的多层板集成。所提多波束的相控阵天线新架构具有高密度集成TR组件、多波束一体化、高效散热等特点,在卫星通信和数据链等方面具有广阔的应用前景。
文摘无线移动通信网络频谱共享即不同制式无线网络共享频谱分配,实现无线频谱的高效利用。对于长期演进LTE(Long Term Evolution, LTE)与全球移动通信系统GSM(Global System for Mobile Communications, GSM)网络的频带共享过程中,GSM会对LTE造成干扰,影响LTE的通信质量,尤其是对LTE下行控制信道物理下行控制信道PDCCH(Physical Downlink Control Channel, PDCCH)的影响。由于PDCCH信道映射的特殊性,使得其无法完全避免干扰对它的影响。鉴于此,文章提出一种适用于第四代移动通信技术4G(The 4^(th) Generation of Mobile Communication Technology Standards, 4G)频带共享网络的PDCCH调度、功率调整方法。其核心思想是:通过共享频带的模型,决定PDCCH调度策略,同时,评估异网络对PDCCH的影响,从而调整PDCCH的功率。保证了控制信道的传输性能,从而完成了高效的、可靠的频谱共享网络通信。
基金supported by the Beijing Natural Science Foundation of China (4102050)
文摘Cognitive radio（CR） technology is considered to be an effective solution to allocate spectrum resources,whereas the primary users of a network do not fully utilize available frequency bands.Spectrum auction framework has been recognized as an effective way to achieve dynamic spectrum access.From the perspective of spectrum auction,multi-band multi-user auction provides a new challenge for spectrum management.This paper proposes an auction framework based on location information for multi-band multi-user spectrum allocation.The performance of the proposed framework is compared with that of traditional auction framework based on a binary interference model as a benchmark.Simulation results show that primary users will obtain more total system revenue by selling their idle frequency bands to secondary users and the spectrum utilization of the proposed framework is more effective and fairer.
