衰落特性 meaning in Chinese
fading characteristics
Examples
- 5 . the detailed compare of the different topologies of receiver based on the in - depth analysis of each part of rfic . and their analysis and simulation results based on different wireless communication standards are also given
在对射频集成电路各部分详细分析以及无线信道衰落特性估计的基础上，对射频接收芯片( receiver )的不同拓扑结构进行了对比和分析。 - On the other hand , cdma ( code - division multiple access ) communication system has been widely considered as the mainstream of 3g communication system , because it has the good qualities such as high utilization ratio of frequency band , low transmission power , powerful anti - multiple path falling and flexible capacity
另一方面， cdma通信系统以其高频谱利用率、低发射功率、强抗多径衰落特性、软容量等优点，已被广泛认为是第三代移动通信系统的主流。 - In this paper , we discuss the principle of mimo - ofdm system based on the introduction of fading channels . furthermore , the channel estimation technique in mimo - ofdm system is investigated , with the emphasis on training sequence - based and pilot - based channel estimation methods , and also several basic and improved algorithms are given respectively . finally , the analysis and comparison of these algorithms is made by computer simulation
本文在分析移动无线信道衰落特性的基础上，阐述了mimo - ofdm系统的基本原理，并围绕该系统中信道估计这一关键技术，深入研究了基于训练序列和基于导频符号的两类信道估计方法，给出几种相应的信道估计算法以及它们的改进算法，最后结合matlab仿真对这些算法的有效性和可行性进行了全面地分析与比较。 - ( 3 ) for the wireless channels subject to several types of fading existing in different time scales , the dynamics of channel conditions are decoupled into two random processes with different mathematic properties in different time scales . two algorithms in this scheme are proposed to dealing with each time scale : the resource optimizer allocates the resource to maximize the total revenue with price fairness and provide qos guarantees to applications , and the slot scheduler exploits the time variability of
（ 3 ）针对无线信道衰落的多时间尺度特性，将信道条件snr分解到不同时间尺度上，在不同时间尺度上针对不同的衰落特性来设计不同的算法，完成不同的任务：在大时间尺度（帧）上进行资源分配，面向应用提供qos保证，保持应用间price公平性的情况下，寻求系统总收益utility的最大化；在小时间尺度（时隙）上进行时隙调度，利用各用户信道容量的时变性，使各用户获得比平均信道条件情况下更高的吞吐量。 - Rapid fading and so on . then we introduce the qam schemes of modulation about the design of parameters and constellations of qam and show the result of 8qam and 16qam . afterward we switch to the study of adaptive project , above all , we find that we can alter the parameter of nakagami fading channels to other fadings , and then we study three different adaptive projects
首先，阐述了移动通信中信道的衰落特性，分别分析信道的阴影衰落、慢衰落、快衰落几种模型；接着对qam的调制原理进行了分析，着重研究了这种调制方式的参数设置以及星座图的设计，文中示出了8qam和16qam的框图和波形情况。