Multipath propagation

In the context of tracking low elevation targets with radar , the multipath propagation would cause acute errors in the elevation angle measurement of the targets .

雷达跟踪低空目标时，由于多路径传播的影响，目标俯仰角的测量会出现测量误差。

A Distribution Density of Multipath Propagation Delay for Mobile Radio Communication

移动通信中多径传播时延的分布密度

A Real-time Simulation Method of Multipath Propagation for Land Mobile Communications

陆地移动通信多径传播的实时模拟技术研究

The Simulation of Multipath Propagation Characteristic of Microwave in a Tunnel

隧道内微波多径传播特性的仿真

Multipath propagation can cause fading , and affects the performance of wireless channel .

多径传播会引起信号衰落，并影响无线信道的性能。

Performance Analysis of Different Modulations ' Abilities to Combat Multipath Propagation in OFDM Systems

OFDM系统中不同调制方式抗多径干扰的性能分析

A Distribution Density of Average Excess Delay of Multipath Propagation for Land Mobile Radio Channels

陆地多径传播信道的平均差分时延的分布

Then we study and propose two effective algorithms to estimate the fading coefficients in multipath propagation .

因此，我们研究并提出了两种有效的算法来对多径传播条件下的衰落系数进行估计。

This paper presents principle of the effects of multipath propagation with its effects on low elevation angle tracking .

介绍多径效应产生的机理及对低仰角跟踪的影响。

Multipath Propagation and Low Elevation Angle Tracking

多径效应与低仰角跟踪

The elevation error of seeker tracking low altitude target was affected by multipath propagation .

雷达导引头跟踪低空飞行目标时，其仰角跟踪误差会受多径传播的严重干扰。

A theoretical distribution density of average excess delay is derived by the use of a new analysis method of multipath propagation .

利用新的多径传播分析方法，从理论上导出了平均差分时延的分布密度。

One of the most challenging problems in high data rate wireless communication is to overcome the time dispersion caused by multipath propagation .

实现高数据速率无线通信所面临的严峻挑战之一是多径传播所带来的时间色散。

Tent law and ray tracing method were used to simulate the multipath propagation characteristic of microwave in rectangular tunnel .

运用射线法和帐篷定律模型对空直矩形隧道微波载波的多径传播特性进行了仿真研究。

In this paper , we study the DOA estimation algorithm in multipath propagation and propose some more superior and effective algorithms .

本文通过对多径传播条件下DOA估计算法的研究，提出了一些更为优越和有效的算法。

In this paper , a low-complexity DOA estimation algorithm is presented for asynchronous DS-CDMA systems with multipath propagation .

针对异步DS&CDMA系统的多用户环境，该文提出了一种低复杂度的DOA估计算法。

In multipath propagation model , arrival angle , delay and strength received by an antenna array for same signal source are estimated .

利用天线阵列对同一信源信号经过多径传输到达终端的时间时延、角度和强度进行了联合估计。

Nowadays , mobile radio communication systems are mainly affected by frequency and time selective radio channel due to multipath propagation and Doppler shifts .

目前，移动通信系统主要受时频选择性信道的影响，这种信道是基于多径传输和多普勒频移的。

Current burst communication system which adopts MSK or QPSK modulation also exists the problem that is weak in rejecting multipath propagation .

目前已有的采用如MSK、QPSK等调制方式的突发通信系统中都存在着抗多径能力不强的问题。

The characteristic of underwater acoustic channel is analyzed in this thesis , with emphasis on the multipath propagation characteristic and the limited bandwidth .

本文研究了海洋水声信道的特性，着重分析并研究了水声信道的有限带宽性，空变、时变、随机性，多径传播特性以及衰落特性等特点。

The signal 's fading which is caused by underwater acoustic channel multipath propagation is the main factors influencing the performance of underwater acoustic communications systems .

水声信道的多径效应，使信号产生严重的衰落效应是影响水声通信系统性能的主要因素。解决水声信道的多径干扰是水声通信研究的关键技术难题。

Channel equalizer module is added into baseband receiver algorithms to resist ISI introduced by GMSK modulation and multipath propagation channels .

基带算法核心是加入均衡器模块来抵消信号调制过程和多径信道传播带来的码间干扰。

OFDM has been used in many wireless communication systems , due to its ability to repress multipath propagation , frequency selective fading and high spectral efficiency .

OFDM调制技术由于其较强的抗多径传播和频率选择性衰落能力以及较高的频谱利用率，在许多无线通信系统中得到广泛应用。

In wireless channel , especially in terrestrial communication environment , with the increase of transmission rate , the multipath propagation effect would influence the quality of communication more seriously .

而在无线信道中，特别是陆地移动通信环境中，随着传输速率的增大，多径传播效应对传输质量的影响将愈加严重。

⑸ Diversity techniques : Because of multipath propagation , the different replicas of the same user signal are received with differential delay greater than one chip .

⑸分集技术：由于多径传播，接收到的信号为来自同一信号源具有不同时延（通常大于码片时间）多径信号的叠加，因而产生衰落。

In comparison to other algorithms , the proposed beamforming receiver provides a well-satisfied performance , especially in correlated signal environment with multipath propagation channels .

与其他相关算法相比，采用该算法后，系统误码性能有明显的改进，尤其是在由多径传播信道引起的相关性信号环境下，效果更为明显。

According to the basic character of mobile radio propagation , a distribution density of multipath propagation delay containing two parameters with characteristics of terrain and propagation is derived .

本文根据移动通信中电波传播的基本特点，推导出以地形特征及传播特征为参数的多径传播时延的分布密度。

Multi-path fading is a serious problem that affects reliability of system . Diversity techniques are effective ways that combat fading induced by multipath propagation in wireless networks .

在无线通信中，多径衰落一直是影响系统可靠性的重要因素之一，分集技术是对抗多径衰落的有效技术。

The physical interpretation relating to the multipath propagation in LOS channels , the relevant typical parameters , and the fading probability distribution are introduced in the second part .

第二部分介绍信道传输中形成多径传播的物理原因、相应的典型数据和衰落概率分布。

But the noises , the attenuation and the multipath propagation inhering in the powerline make it very difficult to realize such kind of communication system .

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。