基于TR069协议实现IPTV盒端管理

通过对IPTV机顶盒管理主要需求和TR069协议特点进行分析,给出了采用TR069协议实现IPTV机顶盒管理的实例化关键流程,对运营商实现IPTV机顶盒管理具有一定的参考价值。     

无线数据收发芯片TR3001的特性及应用

TR3001是RF Monolithics公司推出的单片OOK／ASK收发器芯片，它的工作频率为315.00MHz，接收灵敏度为－100dBm，发射输出功率为1.25mW，其OOK模式下的数据传输速率达19.2kbps，ASK模式下的数据传输速率达115.2kbps，待机模式电流为5μA。文中介绍了TR3001的结构、原理、特性及应用电路。     

TR组件发射波形畸变批次故障分析

在某批次收发组件(TR组件)随整机系统测试时,出现发射波形畸变故障现象.通过对该故障的分析,暴露出TR组件测试系统衰减器与整机测试系统的衰减器类型和衰减量不同,造成测试结果不一致;TR组件的相关检验文件只按技术协议要求施加标准激励,无静态测试,从而造成小信号输入产生自激的批次故障;TR组件所用功放在脉冲供电方式下防过冲措施不到位等3方面问题.     

高性能Ka频段收发前端的研制

介绍了一种Ka频段收发前端的工作原理和工程研制结果。该收发前端采用四次谐波混频器、毫米波微带滤波器、多芯片混合集成等技术,具有高性能、小型化、高可靠性等优点,并在宽温度范围、振动、冲击等条件下,满足毫米波系统要求。     

水声通信中一种新型无前后缀的单载波频域均衡技术

单载波频域均衡(SC-FDE)是水声通信中实现高数据率传输的重要技术之一,但传输序列中周期性插入的循环前缀或保护间隔等前后缀降低了频带利用率和通信速率.该文在时间反转(TR)处理的基础上提出一种新型无前后缀的水声单载波频域均衡技术,即发射机传输无前后缀的单载波信号,接收机对各个数据块的后缀进行重构并利用频域均衡技术消除...     

Metric-Based and Angle-Rotated Tone Reservation Scheme for PAPR Reduction in OFDM Systems

High Peak-to-average power ratio （PAPR） has been a crucial problem in Orthogonal frequency divi- sion multiplexing （OFDM） systems. In all PAPR reduc- tion schemes, Tone reservation （TR） technology is consid- ered as one of the most promising methods because of no additional distortions no side information, and low imple- mentation cost. For conventional TR approaches, the as- signed value to reserved subcarriers just considers one peak value and this brings peak value up again easily. In this paper, a novel scheme named Metric-based angle-rotated （MBAR） for TR is presented. The scheme employs a met- ric to measure how much each subcarrier contributes to the output signal samples of large magnitude and then subcarriers with the largest positive metrics are selected to reduce PAPR. The simulation results show that when the reserved subcarriers number is 1.46 percent, the PAPR gain of the proposed method can achieve 0.4？dB at least at the probability of 10-3.     

Time-resolved SAXS measurements facilitated by online HPLC buffer exchange

Small‐angle X‐ray scattering (SAXS) is a powerful technique to structurally characterize biological macromolecules in solution. Heterogeneous solutions are inherently challenging to study. However, since SAXS data from ideal solutions are additive, with careful computational analysis it may be possible to separate contributions from individual species present in solution. Hence, time‐resolved SAXS (TR‐SAXS) data of processes in development can be analyzed. Many reported TR‐SAXS results are initialized by a sudden change in buffer conditions facilitated by rapid mixing combined with either continuous or stopped flow. In this paper a method for obtaining TR‐SAXS data from systems where the reaction is triggered by removal of a species is presented. This method is based on fast buffer exchange over a short desalting column facilitated by an online HPLC (high‐performance liquid chromatography) connected to the SAXS sample cell. The sample is stopped in the sample cell and the evolving reaction is followed. In this specific system the removal of phenol initiates a self‐association process of long‐acting insulin analogues. For this experiment, data were collected in time series while varying concentrations. The method can be generally applied to other systems where removal of a species or other changes in experimental conditions trigger a process.     

Fast symbol-level synchronization for TR-UWB signals using double hybrid DS-TH spreading

A Transmitted Reference （TR） Ultra WideBand （UWB） signal with double hybrid Direct Sequence and Time Hopping （DS-TH） spreading is proposed and its symbol-level synchronization scheme is designed and analyzed. The proposed signaling format can significantly reduce the search space while reducing the spectral lines and eliminating inter-frame interference and multi-user inter- ference. Detailed analysis of the proposed scheme is carried out. Synchronization performance of the proposed signaling format in multipath channel is derived and supported by computer simulation. The search step which is closely associated with the delay of data modulated pulses is analyzed. Using the TH code, the proposed signaling format and synchronization scheme especially works well in moderate and low data rate systems.     

Kinetic Analysis of a Two‐Phase EC Mechanism with Concomitant Lateral Processes

Electrochemical transfer of azo dye fast red TR across the water/1,2 – dichloroethane (DCE) interface followed by the coupling reaction with 1‐naphthylamine in the organic phase is studied. Pseudo first order rate constants of this reaction were obtained by fitting the experimental I_p?/I_p+ ratio under different experimental conditions with the theoretical values reported by Nicholson and Shain. The occurrence of lateral processes is demonstrated (partition of the azo dye non assisted by potential and electrochemical transfer of the protons generated in the coupling reaction), which constrains the accurate determination of the kinetic parameters.     

采用TR069协议实现机顶盒的管理功能

首先阐述了家庭网络设备的特点,提出家庭网络设备远程管理需要解决的技术问题主要集中在管理通道和管理协议两方面,对于管理协议主要权衡内容包括功能、安全性和实现难度,并对目前两种主要的管理协议SNMP和TR069在功能、安全性和实现难度等方面进行了比较,提出TR069协议,可以更好的解决家庭网络设备远程管理的技术难题.在此基础上,简单介绍了TR069协议的主要内容及其STB数据模型,进而详细阐述了如何采用STB数据模型来实现机顶盒的配置管理、性能管理和故障管理等功能.