| 1. | Several key factors such as signal fading and multi - path effect are further analyzed and simulated . summarizes smart antenna algorithms for cdma mobile terminal
在总结应用于cdma移动终端的智能天线算法基础上，提出一种利用接收信号与期望信号相关特性的新型智能天线算法。 |
| 2. | In wireless communication system , signal fading arising from multipath propagation is a particularly severe channel impairment that can be mitigated through the use of diversity
在移动通信系统中,由于多径传播引起的衰落对信道产生的严重影响可以通过分集技术得到有效的解决。 |
| 3. | Polarization diversity and maximum ratio combining ( mrc ) is used to restrain the sharp signal fading in the telemetry systems , in which the object is in flight at a high speed and rotating and in low elevation
在信号极化衰弱现象严重的环境中对快速飞行目标、低仰角运动目标以及旋转运动目标等进行遥测接收时,极化分集最大比合成技术可以有效的改善接收性能。 |
| 4. | Even though most losses in wireless networks stem from factors like signal fading , interference , and link blackouts , tcp assumes the losses to be related to congestion , so it kicks in algorithms that slow down network traffic
尽管无线网络中的大多数损耗来自信号衰退、干扰以及连接中断等因素，但是tcp假定这些损耗与拥塞有关，因此它摒弃了降低网络流量的算法。 |
| 5. | It is very difficult to design a high - quality underwater acoustic data transmission system . in our study , we use frequency diversity and frequency - hopped technology . this method is an effective solution for the isi and signal fading
该方法起到保证mfsk传输系统使用频率中文摘要统使雨频率分集技术能得以有效的实现；并可用于提高mfsk信号检测精度，因此在频率信号检测中它有广泛应用意义，它是本文重要创新之处。 |
| 6. | 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。 |
| 7. | 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。 |
| 8. | 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。 |
| 9. | 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。 |
| 10. | 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。 |
