查询词典 radio channel

In this paper, we propose a channel management protocol for multi-channel, single-radio 802.11-based wireless mesh networks.

在本篇论文中，我们提出了一个在单一天线多频道的无线网状网路环境下的频道管理协定。

So it holds a ideal ability to anti-interference and has 2 scalar level resolution in location and measuring velocity than traditional radio induction technology. And the channel composed of the new radio induction system for communication is different from the parameter-constant channel and the traditional parameter-changing channel, its parameter is decided by the mutual induction between its antenna and induction-cable, by the location of its antenna, by the signal frequency passing through, its parameter has nothing to do with the time parameter.

而且，由新型无线感应系统组成的信道既不是恒参信道，也不是一般目前所知的变参信道，其信道传递函数的幅值只与信号的频率有关，与系统中天线和感应电缆之间的互感和天线的位置有关，而与时间无关，其信道传递函数的相位只与天线的位置有关，而与时间无关，由新型无线感应系统组成的信道是一种不随时间变化的新型变参信道。

He was frequently involved in practising television and radio as a presenter, in Jiang Su TV, Makeup Channel, Nan Jing TV, Nan Jing Music Channel; and as a dubbing or program director for several movies and TV series.

曾活跃於电视、广播一线，担任江苏电视台、中国靓妆频道、南京电视台、南京音乐台节目主持；担任国内多部电影电视剧配音导演、电视节目导演。

Main products: Series of Amorphous Silicon, monocrystalline silicon, polycrystalline silicon solar panels, solar intelligent controller, solar energy-saving lights, solar charger, solar mobile phone charger, solar lawn lamp, solar fan cap, full-function digital display 12A-Responder Knowledge Contest, Quiz answer in scoring device, the game scoring device, automatic water level controller, automatic rang the bell device (which can work 84 times / day), KD301, when microcomputer automatic control, and rang the bell device, KD302 microcomputer light control, time control switch, KD303 AC-DC dual-use micro-computer radio, rang the bell device, KD304 microcomputer AC-DC dual-use device to play Bell, KD - 18 multi-channel Pager, efficient electronic fishing devices, catch devices, infrared alarm, series inverter, the campus radio controller, smart, laser pointer, program-controlled telephone exchanges, series refrigeration components, series solenoid valve, Series DC lamp, series power hand-lamp, series of photoelectric switches, series of mercury switches, reed pipe series of wet, dry reed pipe, the first series of semiconductor gas, series core, magnetic ring, magnetic tank, ultrasonic transmitting and receiving the first, series fool Wang amplifier, series inverter module, push the module 2436, and so.

主要产品：系列非晶硅、单晶硅、多晶硅太阳能电池板，太阳能智能控制器，太阳能节能灯，太阳能充电器，太阳能手机充电器，太阳能草坪灯，太阳能风扇帽，数码显示12A―全功能知识竞赛抢答器，知识竞赛抢答记分器，球赛记分器，全自动水位控制器，全自动打铃器(可工作84次/天)，KD301微电脑自动时控、打铃器，KD302微电脑光控、时控开关，KD303微电脑交直流两用广播、打铃器，KD304微电脑交直两用打铃器，KD--18多路呼叫器，高效电子捕鱼器，捕器，红外线报警器，系列逆变电源，校园智能广播控制器，激光教鞭，程控电话交换机，系列制冷组件，系列电磁阀，系列直流灯，系列发电手灯，系列光电开关，系列水银开关，系列湿簧管、干式舌簧管，系列半导体气敏头，系列磁芯、磁环、磁罐，超声波发射接收头，系列傻瓜王功放，系列逆变模块，推动模块2436等等。

Output channel 3 or channel 4 of radio frequency modulator can be selected by up/down toggle switch.

射频调制器的输出频道可以通过上/下拨动开关选择3频道/4频道。

In the study process of some kinds of AAM, the simulations of radio amendatory channel have to be carried out in different trajectories in order to validate the capability of radio amendatory channel and calculate the maximum distance that missile can overshoot.

在某型号空空导弹研制过程中，需要对不同攻击弹道的情况下对数据链的遮挡效应进行仿真，以分析导弹无线电修正通道的工作效能，确定改进方案，计算导弹的最大攻击距离。

Cheng xi.graduated from beijing broabcasting instiute in july 2001 with the degree of bachelor of arts.pro-fessional status:mandairn first class grade a after graduation.she hosted for the"new fashion update"pro-gram in the life channel of tv program-producing department in people'sdailyadvertising ltd,the pro-gram was broadcasted by more than 50tv stations nationally.she also hosted "the fortune builedr"program for the biz shannel and young channel in shanghai tv station.after that.she worked for thd"cn stock informa-tion"live financial and economics program in shanhai slock information service corporation,being a hostess as well as editor and reporter.in this corporation she hosted the live propramme of the "finance and economics morning report and commentary","management report and commentary","top executive interviews","enterprise news update"etc.in which she assessed the financial market.the listed compariy news.the financial and ecconomics hot spots.and the industrial tredn with certified analysts.presently she works with shanghai radio station.reporting sports news and hosting radio progams.

程曦，毕业於北京广播学院，获播音与主持专业文学学士学位。普通话水平一级甲等。她曾在人民日报社上海分社影视广告制作有限公司担任电视节目制作部生活类栏目&新时尚报道&的主持人和记者；后兼职担任上海电视台财经频道&创富家园&栏目和生活时尚报道&绿野仙踪&栏目的外景主持人，后又进入上海证券信息有限公司财经演播中心，担任&中国证券信息&专业财经电视资讯系统的节目主持人，记者和编辑工作；主持&财经早报及点评&、&公司公告&、&权威报告&、&上市公司高管访谈&、&股市三人谈&等直播节目。现於上海人民广播电台主持&空中体坛早间直播&和&体育一点通&等节目。

Cheng xi.graduated from beijing broabcasting instiute in july 2001 with the degree of bachelor of arts.pro-fessional status:mandairn first class grade a after graduation.she hosted for the"new fashion update"pro-gram in the life channel of tv program-producing department in people'sdailyadvertising ltd,the pro-gram was broadcasted by more than 50tv stations nationally.she also hosted "the fortune builedr"program for the biz shannel and young channel in shanghai tv station.after that.she worked for thd"cn stock informa-tion"live financial and economics program in shanhai slock information service corporation,being a hostess as well as editor and reporter.in this corporation she hosted the live propramme of the "finance and economics morning report and commentary","management report and commentary","top executive interviews","enterprise news update"etc.in which she assessed the financial market.the listed compariy news.the financial and ecconomics hot spots.and the industrial tredn with certified analysts.presently she works with shanghai radio station.reporting sports news and hosting radio progams.

程曦，毕业于北京广播学院，获播音与主持专业文学学士学位。普通话水平一级甲等。她曾在人民日报社上海分社影视广告制作有限公司担任电视节目制作部生活类栏目&新时尚报道&的主持人和记者；后兼职担任上海电视台财经频道&创富家园&栏目和生活时尚报道&绿野仙踪&栏目的外景主持人，后又进入上海证券信息有限公司财经演播中心，担任&中国证券信息&专业财经电视资讯系统的节目主持人，记者和编辑工作；主持&财经早报及点评&、&公司公告&、&权威报告&、&上市公司高管访谈&、&股市三人谈&等直播节目。现于上海人民广播电台主持&空中体坛早间直播&和&体育一点通&等节目。

Recent progress in radio prototype has extended the horizons of radio technology by liberating chronics dependence on hard-wired characteristics including frequency band, channel bandwidth, and channel coding. These efforts have led us to the feasibility of dynamically programmable receivers system of software radio.

软件无线电系统的硬件结构与功能相对独立，这样就可以基于相对通用的硬件平台，通过软件实现不同的通信功能，并可对工作频率、系统频带、调制方式等进行编程控制，系统的灵活性大大增加。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。