共查询到15条相似文献,搜索用时 62 毫秒
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LaurieWallace 《世界电子元器件》2002,(3):35-36
第三代(3G)无线通信标准,包括W-CDMA、cdma2000、EDGE,正在开始再造移动通信业市场。 鉴于3G无线网被设计为支持使用包协议同时支持话音和宽带数据传输,各基站的功率放大器均必须以更高的效率提供更高的性能。通过采用已包含DSP技术的新型数字放大器,系统设计 相似文献
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LaurieWallace 《世界产品与技术》2002,(5):22-24
第三代(3G)无线通信标准,包括W-CDMA、cdma2000、EDGE,正在开始再造移动通信业市场。诸如实时数据馈送和电视会议等互联网及企业内联网服务,很快将成为经由无线网提供的标准服务项目。为了递送此类内容丰富的新消费产品,人们需要对现有无线基础设施,包括网络的发射基站(BTS),进行彻底改造。 鉴于3G无线网被设计为支持使用包协议同时支持 相似文献
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KevinHuscdroft 《世界电子元器件》2002,(11):56-57
第三代(3G)无线基础设施将实现真正的移动接入互联网并大幅提高新网络的语音容量。现在还需要进一步的技术开发和标准化,以降低成本和推进3G基站收发信台的部署工作。 基站收发信台(BTS)空中及有线线路(Wireline)接口的全球标准在3G中占据了中心地位。对于空中接口,采 相似文献
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TriQuint半导体公司日前宣布,推出全新的集成式射频产品系列的首批成员产品——TQP7M9101和TQP7M9102。该系列作为TriQuint新基站器件系列,功耗极低,且可保护移动网络免受系统断电和服务故障的影响。除这些最新的基站收发器网络器件之外,TriQuint今年上半年还推出了另外12款新的电源 相似文献
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日前,德州仪器(TI)宣布推出业界最宽带宽的完全整合式传输,接收处理器。该处理器具有3G、4G无线基站,无线射频模块及政府通信系统适用的数字预失真(DPD)功能。GC533x系统配备3组立即可用的处理器,提供宽带及多天线无线基站适用的完整且具有高灵活性的数字传输及接收解决方案, 相似文献
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LaurieWallacece 《今日电子》2003,(3):29-31,33
设计WCDMA基站是一项复杂的任务,要求能够设计出同时可满足性能和成本需求的创新型解决方案。功率放大器部件是基站收发器(BTS)最昂贵的组件,并且是目前最大的耗电装置。为解决这些问题,我们正逐渐将注意力集中在使用数字预失真以及先进的振幅控制方案,以便将峰值控制到平均比率。功率放大器线性化和多载波WCDMA信号的峰值到平均值功率的降低对宽频带功率放大器的有效运行及经济高效的整个基站设计而言是十分重要的。数字预失真是一种放大器线性化方法,能显著提高多载波放大器的效率。从本质上讲,该原理非常简单:非线性失真… 相似文献
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Malavasi Stefano Luisa Merani Maria 《International Journal of Wireless Information Networks》2003,10(2):87-100
This paper analyzes the uplink behavior of the multicode and variable spreading factor DS-CDMA systems that accommodate users with different transmission rate requirements in a multicell mobile radio system. It takes into account the possibility of a portable to choose the least interfered among N
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nearest base stations, imperfect power control on slow signal fluctuations resulting from shadowing and random location of the users. System capacity is determined analytically, employing two distinct approximations featuring low computational costs, and by simulation. It is shown that having the portable controlled by the least interfered base produces a remarkable improvement on the performance of both classes of users and that either architecture (multicode or variable spreading factor) can favor voice or data applications through a suitable tuning of system parameters. Moreover, the simulation approach allows to assess the accuracy of the analytical approximations for an interesting range of system parameters. 相似文献
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George Dimitrakopoulos Panagiotis Demestichas Kostas Tsagkaris Aggelos Saatsakis Klaus Moessner Markus Muck Didier Bourse 《Wireless Personal Communications》2009,48(1):33-47
The unparalleled evolution of wireless communications is reflected in the tremendous investments on research and development,
targeted at the continuous introduction of innovations that could serve the information society. This has led to the coexistence
and complementary exploitation of versatile, legacy and also emerging Radio Access Technologies (RATs). At the same time,
the continuously varying environment/users requirements impose the adaptation of those technologies to external stimuli, through
reconfiguration (reconsideration) of their infrastructure and/or operating parameters. One feasible option to tackle the increased
complexity of such environments, is to design wireless infrastructures with learning capabilities, thus forming cognitive
networks. Cognitive networks are able to retain information from their interactions with the environment and intelligently
adapt to any requirements. A prerequisite to facilitate operability of cognitive networks is the development of novel management
mechanisms, which need to, distributively (centralized approaches would get even more complex), evaluate changes in external
conditions and determine the way in which the network will properly respond to them. To this effect, this paper presents a
complete framework under which Cognitive Access Points (CgAPs) could be managed and analyzes the functionality of its entities.
Moreover, it also provides an approach for managing Cognitive Wireless Network Segments (CgWNSs).
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George DimitrakopoulosEmail: |
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针对全双工无线接入与回传一体化小基站场景下长期的频谱效率和能效同时最大化问题,该文提出一种基于近似动态规划理论的接入与回传一体化小基站接入控制与资源分配联合优化算法。该算法首先联合考虑当前基站的资源使用和功率配置情况,在任一用户需求动态到达以及平均时延、小基站回传速率和传输功率约束下,使用受限马尔科夫决策过程(CMDP)建立频谱效率最大化和功率消耗最小化的多目标优化模型,其次运用切比雪夫理论将多目标优化问题转化为单目标问题,并使用拉格朗日对偶分解法进一步转化为非受限的马尔科夫决策过程(MDP)问题。最后,为了解决其求解时存在的“维度灾”爆炸问题,该文提出基于近似动态规划的无线接入与回传一体化小基站资源动态分配算法进行求解,得到此时的接入与资源分配策略。仿真结果表明,所提算法能在保证平均时延约束、小基站回传速率约束和传输功率约束的同时最大化长期平均频谱效率和能效。 相似文献