fast fading造句

• Inked characters fast fading on the frayed breaking paper
  报纸磨破了，上头的油墨字迹很快就模糊了。
• Computer simulation results indicate that the hybrid stbc / v - blast mimo - ofdm system can combat multi - path fading and fast fading at the same time
  仿真结果和理论分析表明,后者能够同时有效对抗多径和快衰落移动信道环境。
• The simulation shows that under the fast fading channel circumstance , the wrls - svm channel estimation can acquire the high error performance
  仿真结果表明，在快衰落信道条件下，小波递归最小二乘支持向量机导频信道估计方法可以获得较好误码性能。
• As the application of rake receivers with multitaps is widely used in cellularcdma systems for exploiting path diversity , the closed - loop power control schemesshould make use of the multitap rake receivers for tracking the power variation dueto path loss , slow fading , and fast fading
  同时,本文给出的自适应变步长闭环功率控制算法利用rake接收机跟踪信道的变化,与传统的固定步长闭环功率控制相比获得了较小的ebi0标准差。
• Multibeam base - station smart antennas are discussed in this paper . we analyze the outage probability of mobile communication system suffering both fast fading and shadowing by means of statistical propagation model , and contrast the case that adopt multibeam smart antennas to the case that adopt omnicase . the results emulated by computer show that the outage probability of mobile communication system will diminish as the increasing of the number of beams using smart antennas no matter when suffering a single co - channel interfence or six ones
  研究了移动通信环境下的多波束智能天线，并基于统计传播的同信道干扰模型，分析了快衰落及慢衰落情况下未采用多波束智能天线与采用多波束智能天线时的中断率，并进行了比较.计算机仿真结果表明：采用多波束智能天线，不论在单个同信道小区还是多个同信道小区情况下，系统的中断率将随着波束数的增大而降低
• After analyzing the performance of the coherent tree - structured optimal joint detection ( tsojd ) for qpsk signals and deriving a non - coherent multi - user weight / phase estimator , the dissertation proposes a low complexity non - coherent multi - user weight / phase optimal joint detection algorithm . besides , the dissertation proposes a partial coherent multi - user / iv weight / phase optimal joint detection algorithm and some useful conclusions are obtained in comparison experiments . 4 . in the research on the diversity techniques for fast fading multi - path channels , the dissertation proposes a time - scale rake receiver , and analyzes its performance with the conception of auto - wavelet - transform ( awt ) and time - - scale resolution
  提出了过饱和低复杂度qpsk信号的树型最佳联合检测算法，并分析了相应最佳接收机的性能及相位偏差对性能的影响等问题；考虑了载波相位和多用户信码的联合检测问题，通过理论推导给出了过饱和多址系统中多用户信码/相位联合估计子，提出了低复杂度非相干多用户信码/相位最佳联合检测算法，并分析了此非相干最佳接收机的误码性能及相位提取误差等有关问题；提出了部分相干多用户信码/相位最佳联合检测算法，通过计算机仿真分析了该接收机的误码性能及相位提取误差等有关问题，并与相干、非相干解调两种情况作了比较，得出了一些有益的结论。
• Two approaches to improve the robustness of the detector , each based on a different theirs distortion mechanism . one is based on the modeling as fast fading distortion ( ffd ) whose optimum detector is the segmented replica correlator ( src ) . the second approach is replica correlation integration ( rci ) for time spreading channel ( tsd )
  从频率扩展信道( fastfadingdistortion ， ffd )和时间扩展信道( timespreadingdistortion , tsd )的形成机理出发建立了目标回波的数学模型，指出ffd和tsd的最佳检测器分别为分段副本相关器( src )和副本相关积分器( rci ) 。
• Combined with the data - selected schemes proposed , the computational complexity of this method can be lowered . the performance of the presented rls method is analyzed by simulations , and it is shown that this method is interesting for application . 4 time - selective channel signal model based on multipath - doppler diversity representation is given in multi - path fast fading channel , and rls space - time receiver algorithm based on time - varied constraint condition is presented and the computational complexity of this method is analyzed
  4 、针对多径快衰落信道下的ds - cdma系统，给出了基于多径-多谱勒观点描述的1百安电弓卜科东兔j忆学协士学位论文时间选择性信道的信号模型，提出了基于变约束条件下的递归最小二乘空时接收机算法并分析算法的运算量，最后通过仿真分析了所提出的方法的性能。
• Considering the disadvantages of these methods in dealing with fast fading channels , a chip - level adaptive channel estimation method is proposed in this thesis and has better performance than other methods . furthermore , a procedure to derive optimum step length for this technique is given in particular
  在分别对简单平均, wmsa和fbprelms信道估计算法进行分析后,着重介绍了适于低速与高速衰落情况下,进行码片级自适应变步长lms信道估计的由来、原理与实施的具体方法,并且推导了变步长的选取。
• At first , wireless channel and characteristic of radio propagation are investigated in order to learn them . then smart antenna , which will be adopted widely , is researched . finally , the space - time receiver technology under multipath slow fading channels and multipath fast fading channels is studied emphatically , this content is the core of this paper
  因此，本文首先研究了无线信道及其电波传播特性，以期对无线移动通信的无线信道有充分的认识；接着研究了必将广泛被采用的智能天线技术(它能引进空间分集，抗信道衰落，并提高系统容量) ；最后，基于对信道的认识并把智能天线技术结合，着重研究了在多径慢衰落信道与多径快衰落信道下的空时接收机技术，这部分内容是本文核心。