As an important branch of telecommunication technology, digital home networks have quickly developed in recent years. Although architecture of the digital home network based on telecommunication networks has been stan...As an important branch of telecommunication technology, digital home networks have quickly developed in recent years. Although architecture of the digital home network based on telecommunication networks has been standardized in China, only wireless access is defined to be allowable. Therefore, it becomes the focus of further research how to establish a wireless digital home network. This article proposes the concept and shows the architecture of ubiquitous access for wireless digital home networks. Moreover, key technologies for ubiquitous access are discussed here, including cognitive radio, the concept of wireless Mesh, generic link transfer mechanism, Quality of Service (QoS) guarantee mechanism, Electromagnetic Compatibility (EMC) and coexistence of heterogeneous systems.展开更多
随着网络技术的发展,无线网络接入认证技术的应用越来越广泛。通过远程认证拨入用户服务(Remote Authentication Dial In User Service,RADIUS)和数字证书配合使用,可以实现较为安全完善的无线网络接入认证。介绍RADIUS和数字证书的相...随着网络技术的发展,无线网络接入认证技术的应用越来越广泛。通过远程认证拨入用户服务(Remote Authentication Dial In User Service,RADIUS)和数字证书配合使用,可以实现较为安全完善的无线网络接入认证。介绍RADIUS和数字证书的相关概念,概述使用RADIUS和数字证书进行无线网络接入时的网络拓扑与接入认证过程,给出RADIUS代理服务器、认证服务器以及数字证书的配置方法同时,给出验证该无线网络接入认证技术的方法,也是Linux客户端进行网络接入认证的方法。通过搭建RADIUS网络接入环境,使用数字证书作为认证凭证,实现客户端对无线网络的接入认证。展开更多
A 2-GHz radio frequency transceiver is presented and implemented for third generation mobile communications using wide-band code division multiple access （WCDMA） scheme. Performance measuring systems are introduced ...A 2-GHz radio frequency transceiver is presented and implemented for third generation mobile communications using wide-band code division multiple access （WCDMA） scheme. Performance measuring systems are introduced for transmitter channel and receiver sensitivity, respectively. The transceiver achieves maximum output power of 22 dBm, dynamic range of 85 dB, adjacent channel power rejection ratio （ACPR） of -41dB@5MHz, and receiver sensitivity of-119.6 dBm for 128-kb/s data at 3.84-Mcps spreading rate. The measured results indicate the conformity to the required commercial 2.0-GHz WCDMA specification and 3GPP requirements.展开更多
文摘As an important branch of telecommunication technology, digital home networks have quickly developed in recent years. Although architecture of the digital home network based on telecommunication networks has been standardized in China, only wireless access is defined to be allowable. Therefore, it becomes the focus of further research how to establish a wireless digital home network. This article proposes the concept and shows the architecture of ubiquitous access for wireless digital home networks. Moreover, key technologies for ubiquitous access are discussed here, including cognitive radio, the concept of wireless Mesh, generic link transfer mechanism, Quality of Service (QoS) guarantee mechanism, Electromagnetic Compatibility (EMC) and coexistence of heterogeneous systems.
文摘随着网络技术的发展,无线网络接入认证技术的应用越来越广泛。通过远程认证拨入用户服务(Remote Authentication Dial In User Service,RADIUS)和数字证书配合使用,可以实现较为安全完善的无线网络接入认证。介绍RADIUS和数字证书的相关概念,概述使用RADIUS和数字证书进行无线网络接入时的网络拓扑与接入认证过程,给出RADIUS代理服务器、认证服务器以及数字证书的配置方法同时,给出验证该无线网络接入认证技术的方法,也是Linux客户端进行网络接入认证的方法。通过搭建RADIUS网络接入环境,使用数字证书作为认证凭证,实现客户端对无线网络的接入认证。
文摘A 2-GHz radio frequency transceiver is presented and implemented for third generation mobile communications using wide-band code division multiple access （WCDMA） scheme. Performance measuring systems are introduced for transmitter channel and receiver sensitivity, respectively. The transceiver achieves maximum output power of 22 dBm, dynamic range of 85 dB, adjacent channel power rejection ratio （ACPR） of -41dB@5MHz, and receiver sensitivity of-119.6 dBm for 128-kb/s data at 3.84-Mcps spreading rate. The measured results indicate the conformity to the required commercial 2.0-GHz WCDMA specification and 3GPP requirements.
