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Description: In networks without a hierarchy, any wireless device in the network can work as relay. In hierarchical multihop networks, only special devices provide relaying functionality.
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Size: 254976 |
Author: alaa |
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Description: 近年来随着移动互联网业务和物联网业务的兴起与
发展，用户对移动宽带业务需求越来越旺盛，对移动通信
网络的接入速率和质量要求也越来越高，原有基于码分多
址（CDMA）的3G及其增强技术未来将无法满足业务发展
需要，因此3GPP及3GPP2组织自2004年开始启动长期
演进（LTE）/空口演进（AIE，后改名为超移动宽带UMB）项
目，旨在通过引入一些关键技术，如正交频分复用（OFDM）
调制技术、多入多出（MIMO）技术、混合自动重传请求
（HARQ）、全IP扁平化架构及动态带宽分配等实现网络变
革，达到以下所述的网络性能，为移动宽带多媒体业务持
续发展提供技术保障。-Abstract:To meet the needs of mobile broadband
services,LTE is being deployed and becoming ma－
tured,which includes key technologies such as
OFDM,high-order modulation,HARQ,enhanced
multi-antenna technologies,fast synchronization
technologies,scalable control channel design,adap－
tive resource allocation,interference suppression
technologies etc.Moreover,the discussion on LTE-
Advanced has started,where technologies being
considered includes aggregate multi-carrier,high－
er-order MIMO,smart relay,heterogeneous net－
work,multipoint collaboration as well as enhanced
interference management.
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Size: 78848 |
Author: 涛 |
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Description: 提出一种适用于数字微波接力系统的基
带光纤拉远的接口方案 采用高性能千兆以太网物理层芯片 88E1111 和 1.25G 光收发器 SSFF3151 完成基带接口
基带信号可以通过数字光纤传输技术传到远端 并恢复射频信号 介绍了 88E1111 的工作原理 性能 接口等 并给出硬件电路设计的原理 以及各部分的具体实现方法和原理图 -Compared with the traditional RF and IF pulls distant technology the baseband optical pulls distant technology
has some obvious superiority,especially in feeder line processing and choice of station site it has become the main pulls
distant technology in 3G network such as TD SCDMA.Refering to the baseband optical pulls distant technology in 3G
network the paper proposes a scheme which is suitable for the digital microwave relay system.The design uses high
performance Gigabit chip 88E1111 and 1.25G optical transceiver SSFF3151 to compelete the baseband interface.The signal
transmits to the remote through the digital fiber and restores the radio frequency signal.This paper introduces 88E1111 s
principle performance interface the hardware circuit design principles as well as part of the concrete implementation and
schematic diagrams.The scheme satisfies the baseband transmision in the stability and the error rate aspect.It can be used in
kinds of digital microwave relay systems.
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Size: 143360 |
Author: moon |
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