使用随机桥过程研究超宽带(uwb)多径传播信道。
Stochastic bridge processes are employed to analyze the characteristics of UWB multipath propagation channels in the current research.
典型的室内传播信道为莱斯衰落信道，可将其分解为LOS传播信道和散射信道。
Typical indoor wireless channel is Ricean fading, and can be decomposed into the sum of an LOS propagation channel and a scattering channel.
室内环境中无线网络的有效设计、评估和安装是建立在对无线传播信道的准确描述之上。
Effective designing, assessment, and installation of a radio network in an indoor environment require an accurate characterization of radio propagation channel.
信道估计是CD MA系统中的关键技术，涉及到对用户信号传播信道的幅度、相位和延时的估计。
The parameter estimation of the signal propagating channel in CDMA systems is a key technology, which involves estimation of amplitude and delay of signal propagating channels.
众所周知，水下声信道是相干多途信道，信号在信道中的多径传播使得接收信号序列复杂化，因而极大地增加了信号处理的难度。
It's well known that underwater acoustic channel is a coherent multi-path channel, which brings difficulties in signal processing because of the complexity of the received signal sequence.
其次重点研究了移动传播环境的频率选择性信道的建摸方法，并给出了模型的硬件实现结构和仿真结果。
Then it introduces the modeling method of frequency selection channel in mobile transmission environment. It also gives the model hardware implementation architecture and simulation results.
合适的水声传播模型是水下声信道传递函数预报的基础。
The proper sound propagation model is the basis of transfer function prediction of underwater acoustical channel.
正交频分复用(OFDM)是一种新型调制技术，特别适合在多径传播的无线移动信道中高速传输数据。
OFDM (Orthogonal Frequency Division Multiplexing) is a new modulation technology, it is suitable to high-data-rate transmission in the wireless transfer channel with multi-path transmission.
但是电力线信道上存在的各种噪声、衰减和多径传播等问题，这些都大大提高了通信的难度。
But the noises, the attenuation and the multipath propagation inhering in the powerline make it very difficult to realize such kind of communication system.
然后讨论了无线移动通信的传播环境，得到时变衰落信道的特点。
Then it analyzes the wireless mobile communication propagation environment and gets the characters of timing varying fading channel.
从该电子密度模式和电离层波传播特性出发确定多径分量，计算短波信道相干带宽。
The coherence bandwidth of shortwave channel is calculated by using the density profile and wave propagation features in ionosphere.
从随机桥过程出发引入随机波束概念，使用随机波束研究超宽带(uwb)室内多径信道的传播特性。
Based on stochastic bridge processes, an idea of stochastic beams is introduced, which can be used to exploit the propagation characteristics of Ultra-wideband (UWB) indoor multipath channels.
视频信号在基于运动补偿预测的混合编码后，在不可靠信道中传输时会遇到严重的误码传播问题。
When hybrid coded video with motion compensated prediction (MCP) is transmitted over unreliable channels there exists the annoying problem of error propagation.
超宽带信号经多径信道传播会产生严重的时间弥散。
In multipath environments, ultra-wide band signals suffer from severe time dispretion.
根据北京地区移动通信无线电传播规律，在信号快衰落幅度服从m衰落的基础上，给出了M衰落波形信道的计算机仿真模型。
Based on the propagation regularity of land mobile communication in Beijing, this paper gives the computer simulation model of M-distribution fading wave channel.
在调制信号前采用数据预编码，对接收信号进行相应译码，以消除信道中噪声引起的差错传播。
Error propagation caused by noise can be avoided by precoding the data at the transmitter prior to modulation and decoding operation of received signals.
海洋作为水下声波传播的介质，从通信论的观点来看，海洋就是声信道。
From the point of the view of the communication theory, the ocean, as the media of sound transmission, is called to be underwater sound channel.
地波传播受天气的影响较小，比较稳定，信道参数基本上不随时间的变化而变化，是恒参信道。
The transmission of the earth wave is stable, hardly influenced by climate and its channel parameter does not change with time basically, it is Constant Parameter Channel.
本文研究多径衰落信号的多重分形性质，分析并指出了信号多重分形维数是描述无线信道传播特性的重要参数；
Fractal characteristic of multipath fading signal is studied in the paper which shows that multifractal dimension is a key parameter for describing the signal propagation in wireless channels.
为解决无线网络中长传播时延所带来的信道资源利用率低的问题，提出一种基于快速预约按需发送（FRODT）的媒质接入控制（MAC）协议。
To solve low channel utilization problem caused by long propagation delay in wireless networks, a fast reservation on-demand transmission (FRODT) medium access control (MAC) protocol is proposed.
其中主要为无线衰落信道中的多径传播和散射引起的信号衰落，以及大的多径时延而引起的符号间干扰。
The problems mainly exhibit to be multi-path propagation in the wireless fading channel, signal fading caused by the scattering and Inter-Symbol Interference caused by the long multi-path time delay.
根据电磁波在无线信道中传播的随机特性，使用随机射线建模电磁波传播。
According to stochastic characteristics of electromagnetic wave propagating in wireless channels, stochastic rays are employed to model electromagnetic wave propagation.
定义了传播特性(信道参数)以及同频小区的位置。
The definition of the propagation characteristics (channel parameters), as well as with the frequency of residential location.
然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；
Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;
论文主要工作有：1。通过分析信号在无线信道的传播特性，建立了无线信道模型。
The main contents of the thesis are displayed as follows: 1. Wireless channel model has been established by analyzing the signal propagation characteristics in wireless channel.
首先，文章分析了无线信道的传输特性，对几种常见的衰落进行了具体的介绍。分析了无线信道的传播模型。
First of all, analyze the transmission characteristic of wireless channel, describe in detail several types of common attenuation and give the transmission model of wireless channel.
论文首先介绍OFDM的基本结构和OFDM 技术的应用领域，然后论述了移动通信中的多径信道成因对信号传播的影响。
Firstly, the basic structure and the application fields of OFDM is introduced, and then the reason of the mobile multipath channel's forming and its influence on signals is elaborated.
论文首先介绍OFDM的基本结构和OFDM 技术的应用领域，然后论述了移动通信中的多径信道成因对信号传播的影响。
Firstly, the basic structure and the application fields of OFDM is introduced, and then the reason of the mobile multipath channel's forming and its influence on signals is elaborated.
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