Compared with the services in 3G, services in Beyond 3G (B3G) have some distinctive characteristics such as the packet data services being the majority, more service types, larger scale of services, higher peak transm...Compared with the services in 3G, services in Beyond 3G (B3G) have some distinctive characteristics such as the packet data services being the majority, more service types, larger scale of services, higher peak transmission rate, enlarged range of transmission rates, more spatial and temporal distribution differences, and more service transmission requests occurring in fast moving vehicles. In order to meet the requirements of B3G services, the B3G systems must have great improvement in network architecture, air interface scheme, radio resource allocation strategy, frequency bands, and Radio Frequency (RF) technology etc. Therefore, the research of the B3G systems should focus on the theory of generalized cellular communications networks, theory of the Multiple Input Multiple Output (MIMO) wireless transmission system, matching of radio resources to new-type air interfaces, new iterative detection and adaptive link methods, and new-type antenna and RF technologies.展开更多
东芝美国电子元器件公司（Toshiba America Electronic Components，TAEC）日前发布一款中等功率SiGe BiCMOS功率放大器TA4401CT，该产品适合于1．9GHz至2．5GHz频带的无线应用，包括无线LAN（WLAN）、PHS以及蓝牙等。TA4401CT采用了3...东芝美国电子元器件公司（Toshiba America Electronic Components，TAEC）日前发布一款中等功率SiGe BiCMOS功率放大器TA4401CT，该产品适合于1．9GHz至2．5GHz频带的无线应用，包括无线LAN（WLAN）、PHS以及蓝牙等。TA4401CT采用了3个串联RF级以实现线性，高效和低功耗的性能优化，该器件符合IEEE802．11g标准，展开更多
基金Program ofNational Nature Science Foundation of China(No. 60496311) Project of National "863"Plan ofChina (No. 2005AA121052)
文摘Compared with the services in 3G, services in Beyond 3G (B3G) have some distinctive characteristics such as the packet data services being the majority, more service types, larger scale of services, higher peak transmission rate, enlarged range of transmission rates, more spatial and temporal distribution differences, and more service transmission requests occurring in fast moving vehicles. In order to meet the requirements of B3G services, the B3G systems must have great improvement in network architecture, air interface scheme, radio resource allocation strategy, frequency bands, and Radio Frequency (RF) technology etc. Therefore, the research of the B3G systems should focus on the theory of generalized cellular communications networks, theory of the Multiple Input Multiple Output (MIMO) wireless transmission system, matching of radio resources to new-type air interfaces, new iterative detection and adaptive link methods, and new-type antenna and RF technologies.
文摘东芝美国电子元器件公司（Toshiba America Electronic Components，TAEC）日前发布一款中等功率SiGe BiCMOS功率放大器TA4401CT，该产品适合于1．9GHz至2．5GHz频带的无线应用，包括无线LAN（WLAN）、PHS以及蓝牙等。TA4401CT采用了3个串联RF级以实现线性，高效和低功耗的性能优化，该器件符合IEEE802．11g标准，
