signal fading中文什么意思

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1. Because of the affection of noise and signal fading , in order to high data rate access and high quality , wireless communication need new technology to improve the link reliability and enhance the spectrum efficiency . mimo ( multiple input and multiple output ) can enhance the spectrum efficiency and increase channel capacity greatly , and reduce the multipath affection without spectrum band and power increasing . the 3th generation mobile communication wcdma is coming , with the purpose of putting mimo , stbc ( space time block coding ) , space diversity into practice of wcdma systems , in order to lay the foundation of 3g toward 4g , this dissertation has done some research under this background
   在发射机和接收机使用多个天线进行数据传输的多输入多输出( mimo )技术,可以在不增加带宽和天线发送功率的条件下,成倍的提高频谱利用率,提高系统的信道容量,还可以抗多径干扰。第三代移动通信wcdma即将到来,为了将多天线技术( mimo ) ,空间分集技术,空时编码技术用到wcdma系统中去,为第三代移动通信向第四代移动通信系统平稳过渡奠定一定的基础,需要做一些理论上的研究。
2. With the characteristics of large ambient noise , very narrow bandwidth , low carrier frequency , great propagation latency and time - space - frequency variant multipath effect ( mpe ) , the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications . among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )
   但是噪声高、带宽窄、载波频率低、传输时延大、多途径效应随时间?空间?频率变化等信道特性都会给有效、可靠的水声通信带来很大的麻烦，其中多途径效应是最主要的困扰因素，它会导致信号幅度衰落和码间干扰。