智能型无线网络芯片制造商Quantenna communications日前发表全球第一款完全整合的802．11n芯片组，具有4×4 MIMO（多重输入多重输出）系统及传输波束成形技术，可确保任何家用环境、任何地点所使用的无线带宽。Quantenna High Sp...智能型无线网络芯片制造商Quantenna communications日前发表全球第一款完全整合的802．11n芯片组，具有4×4 MIMO（多重输入多重输出）系统及传输波束成形技术，可确保任何家用环境、任何地点所使用的无线带宽。Quantenna High Speed（QHS？）芯片组系列能以前所未有的超高可靠性．支持无线网络的高画质（HD）多媒体内容传输。Quantenna先进的架构．展开更多
无线局域网络(WLAN:Wireless Local Area Networks) 是计算机网络与无线通信技术相结合的产物。从专业角度讲,无线局域网是利用了无线多址信道的一种有效方法来支持计算机之间的通信,并为通信的移动化、个性化和多媒体应用提供了可能。...无线局域网络(WLAN:Wireless Local Area Networks) 是计算机网络与无线通信技术相结合的产物。从专业角度讲,无线局域网是利用了无线多址信道的一种有效方法来支持计算机之间的通信,并为通信的移动化、个性化和多媒体应用提供了可能。通俗地说,无线局域网就是在不采用传统缆线的同时,提供有线以太网的功能。展开更多
A simple and compact microstrip-fed ultra wideband （UWB） printed monopole antenna is presented. The antenna is composed of a circular radiator and a finitely grounded plane. The antenna occupies about 16.62 GHz abso...A simple and compact microstrip-fed ultra wideband （UWB） printed monopole antenna is presented. The antenna is composed of a circular radiator and a finitely grounded plane. The antenna occupies about 16.62 GHz absolute bandwidth and 142.7% relative bandwidth covering from 3.38 GHz to 20 GHz with voltage standing wave ratio （VSWR） below two. A quasi-omnidirectional and quasi-symmetrical radiation pattern in H plane is obtained in the whole bandwidth. The high performance of the antenna is validated with measured and simulated results given. The antenna can be applied for the system design of UWB wireless communication.展开更多
A cognitive radio transmitted reference ultra-wideband（CR-TR-UWB） system is proposed to improve the performance of TR-UWB systems with narrowband interference（NBI） from primary users（PU）.The transmitter of the C...A cognitive radio transmitted reference ultra-wideband（CR-TR-UWB） system is proposed to improve the performance of TR-UWB systems with narrowband interference（NBI） from primary users（PU）.The transmitter of the CR-TR-UWB system detects the band of PU,and then sends prolate spheroidal wave functions（PSWF） pulses with the same limited band as PU＇s to reduce interference with PU.The receiver uses a notch filter before autocorrelation to eliminate NBI from PU.The simulation results show that the bit error rate（BER） performance of the CR-TR-UWB system is close to that of TR-UWB systems without NBI when the system is interfered by single or double NBIs with a signal to interference ratio（SIR） of 0 dB,and if the signal to noise ratio（SNR） is 10 dB and the SIR varies from-20 to 10 dB,BER performance varies no more than an order of magnitude.The system has excellent resistance to NBI,strong robustness BER performance at different SNRs,and smaller interference with the same frequency band PU.展开更多
文摘智能型无线网络芯片制造商Quantenna communications日前发表全球第一款完全整合的802．11n芯片组，具有4×4 MIMO（多重输入多重输出）系统及传输波束成形技术，可确保任何家用环境、任何地点所使用的无线带宽。Quantenna High Speed（QHS？）芯片组系列能以前所未有的超高可靠性．支持无线网络的高画质（HD）多媒体内容传输。Quantenna先进的架构．
文摘无线局域网络(WLAN:Wireless Local Area Networks) 是计算机网络与无线通信技术相结合的产物。从专业角度讲,无线局域网是利用了无线多址信道的一种有效方法来支持计算机之间的通信,并为通信的移动化、个性化和多媒体应用提供了可能。通俗地说,无线局域网就是在不采用传统缆线的同时,提供有线以太网的功能。
文摘A simple and compact microstrip-fed ultra wideband （UWB） printed monopole antenna is presented. The antenna is composed of a circular radiator and a finitely grounded plane. The antenna occupies about 16.62 GHz absolute bandwidth and 142.7% relative bandwidth covering from 3.38 GHz to 20 GHz with voltage standing wave ratio （VSWR） below two. A quasi-omnidirectional and quasi-symmetrical radiation pattern in H plane is obtained in the whole bandwidth. The high performance of the antenna is validated with measured and simulated results given. The antenna can be applied for the system design of UWB wireless communication.
基金The National Research and Development Program of China(863 Program)(No.2007AA12Z238)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(No. 12KJD510008)
文摘A cognitive radio transmitted reference ultra-wideband（CR-TR-UWB） system is proposed to improve the performance of TR-UWB systems with narrowband interference（NBI） from primary users（PU）.The transmitter of the CR-TR-UWB system detects the band of PU,and then sends prolate spheroidal wave functions（PSWF） pulses with the same limited band as PU＇s to reduce interference with PU.The receiver uses a notch filter before autocorrelation to eliminate NBI from PU.The simulation results show that the bit error rate（BER） performance of the CR-TR-UWB system is close to that of TR-UWB systems without NBI when the system is interfered by single or double NBIs with a signal to interference ratio（SIR） of 0 dB,and if the signal to noise ratio（SNR） is 10 dB and the SIR varies from-20 to 10 dB,BER performance varies no more than an order of magnitude.The system has excellent resistance to NBI,strong robustness BER performance at different SNRs,and smaller interference with the same frequency band PU.
