频率选择性

• It combines the advantages of ofdm and cdma . it can convert the frequency selective channel propagation of the broadband to flat channel of the subcarrier
  它结合了ofdm和cdma技术的优点，能够把宽带频率选择性衰落转化为每子载波的平坦信道。
• New generation broadband wireless communications should be able to provide reliable high - data - rate transmissions in time and frequency selective wireless channel
  新一代无线通信系统应能在时间?频率选择性衰落信道中提供优质可靠的数据传输服务。
• Subsequently the channel was modeled for three types namely additive white gaussian noise , flat fading and frequency selective fading . lastly , the receiver was studied
  接下来信道建模成三种不同的类型，即加性高斯白噪声信道、平坦衰落信道和频率选择性衰落信道。
• Two simulation algorithms of realization channel characteristic are analyzed emphatically : shaping of slow fading with correlation and generation of frequency - selected multipath fading
  重点分析了实现信道特性仿真的两种算法：慢衰落的相关性整形和频率选择性多径衰落。
• This scheme not only decreases the lattice reduction complexity but also presentes a good detection performance . at last , based on the research of mimo precdoding techniques under the flat
  最后在对平坦衰落信道下mimo预编码技术研究的基础上,开展了准静态频率选择性信道下预编码技术的研究。
• But when the bit rate is above 1 mbps , the signal suffers frequency select fading , which causes the serious intersymbol interference ( isi ) . increasing the system power can ’ t reduce the ber
  但是当码速率提高到1mbps以上时,信号受到频率选择性衰落,码间干扰严重,增大系统功率也不能降低系统误码率。
• Based on the research of mimo detections under the flat fading channel , this paper focuses on the mimo detection under the frequency selective fading channel , chiefly aiming at the lll detection algorithm
  在对平坦衰落信道下mimo检测技术研究的基础上,本文展开了对频率选择性信道下mimo检测技术的研究。
• We considered the frequency chosen character of erf and its modulatory ability may be owe to the coupling of microwave and the polaritons . at the same time there may be other coupling effect and excitation too
  初步认为频率选择性及透过强度可调控性与电流变液和微波之间的相互作用导致的极化激元之间的祸合有关。
• In wireless digital transmissions , due to the delay dispersion of the transmitted symbols and the limitation of channel bandwidth , the channel may induce inter - symbol interference ( isi ) , which results the frequency selective fading
  在无线数字传输中，由于时延扩展和信道带宽限制，引起码间串扰，产生频率选择性衰落。
• Chapter 4 discusses mimo channel estimation in frequency - selective fading , and investigates the design of training sequence . methods investigated in this work can exploit the capacity potential of the wireless channel
  第4章主要讨论了频率选择性mimo信道的信道估计算法和导频设计问题，针对文献中一些典型的算法进行了仿真研究。