signal fading中文什么意思

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1. On the every different application environment , this system must adopt the effective , advanced and applied technology to reject signal fading caused by mai , mutipath and near - far effects , and also to solve the corresponding problem existented at the practice communication
   在各种不同的应用环境情况下，这个系统必须采用有效的、先进的和实用的技术抑制由于多址、多径及远近效应引起的信号衰落，并且要不断解决实际通信中存在的相应难题。
2. Then the signal fading problem of the sensor arising from environmental effects is presented and several solving methods are introduced . at last , we choose the closed loop controlling working point method to stabilize the sensor ’ s working point because of its ’ high sensitivity and simple structure
   研究了外界环境变化引起的干涉仪输出信号衰落问题,在比较几种常见的解决方案后,选用灵敏度高、结构简单的闭环控制工作点算法来稳定干涉仪的工作点。
3. Lt is well anown that the multi ? ath effeet results in signal fading and intersymbol interference ( isd , wnich causes great difficulhes in pewces of transndssion in underwater acoushc cotnmnication . in this papef we used frequency diversity method to overcome the problem of signal fading , and used the frequency - hopping method to ebonate the isi caused by multi - path
   水声信道多途特性引起的信号衰落和码间干扰是影响水下通信质量的主要因素，采用频率分集技术可以处理幅度衰落，而跳频技术则可以简单、有效地抗多途引起的码间干扰。
4. So the acoustic wave is the only practical solution in this channel . an underwater acoustic channel is characterized as a multi - path channel due to signal reflections from the surface and the bottom of the sea . because of wave motion , the signal multi - path components undergo time - varying propagation delays that result in signal fading and inter - symbol interference ( isi )
   本文从分析浅海水声信道的传输特性入手，针对多途径效应引起的幅度衰落及码间干扰问题，提出一种适用于水声e - mail通信的十六进制(或八进制)数字频移键控( mfsk )传输系统。
5. It has been proven that the spread spectrum technologies have good capabilities of overcoming isi in electromagnetic wireless channel . the feasibilities of their applications to underwater acoustic channel have been analyzed , the frequency hopping technology is chosen . instead of using time - frequency diversity , convolutional coding and viterbi decoding are employed to combat signal fading , consequently the bit - rate and bit - error - rate performance of the underwater acoustic voice communication system can be balanced and controlled
   由于扩频技术在抗码间干扰方面具有优良的特性，因此在分析了各种扩频技术于本研究应用的可行性之后，确定了跳频技术作为具体实现方案；在克服幅度衰落方面，选用卷积编码和维特比译码方法来替代原有的分集技术以综合调节系统的通信速率与误码性能，达到差错可控的目的。