多径是扩频测距系统的主要误差源之一。
Multipath is one of the major sources in the Spread-spectrum ranging systems.
在多径衰落信道下，这些参数是很难获得的。
These parameters are difficult to obtain in multipath fading channels.
接下来论述了激光通信中多径效应的特殊性。
Then this paper discusses particularity of multipath effect of laser.
在实际的通信环境中，信号往往是多径传播。
In real communication environment, signal transmits with multi-path.
通过对多径信号的平均能有效地减小量化误差。
Quantization errors can be effectively reduced by means of a multipath averaging procedure.
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.
第二章分析了无线信道的多径效应和小尺度衰落效应。
The second chapter of this paper analyzes the multipath effects and fading effects of wireless channel.
阴影效应服从对数正态分布，而多径衰落服从瑞利分布。
The shadow affect is logarithmic normal distribution, and the multi-path fading is Rayleigh distribution.
GPS接收机的误差受多种因素影响，多径干扰便是其中一项。
The GPS error is influenced by a lot of factors, one of them is multipath effect.
其次，提出了电力线噪声信道和多径信道的神经网络优化建模方法。
Secondly, power line noise channel and multi-path channel optimization modeling techniques based on artificial neural network are proposed.
井下无线信号的传输属于有限空间的信号传输，多径效应的影响是比较严重。
Underground wireless signal transmission belongs to the transmission of limited space, and its multi-path effects are more serious.
几个考虑的主要参数有平均链路簇，多径数目，路径复杂度和跳数差别因子。
Several main considered parameters are average link clustering, number of multiple paths, path complexity factor, and hop difference factor.
基于频域子空间思想，给出了一种适用于非周期扩频系统的多径时延估计方法。
Based on the idea of frequency domain subspace, a multipath delay estimating method for aperiodic spreading system is proposed.
UWB主要应用于密集多径室内信道中，多径干扰是系统的主要干扰来源之一。
Since UWB system generally operates in dense multipath indoor channel, multipath interference becomes one of the main interferences affecting system performance.
我们还分析了在多用户多径分集方案中如何支持可变质量可变速率的多媒体业务。
We also analyze how to provide multimedia services with the variable quality and variable information rate in the proposed system.
研究表明，该算法既能在AWGN信道中也能在多径衰落信道中完成频偏跟踪工作。
The study shows that the algorithm can complete frequency offset tracking in AWGN channel and multipath fading channel.
本文中提出的这种算法适用于多径衰落信道，能很好抵消多址干扰和克服多径衰落。
It can be used in multipath channels to suppress multi-address interference and overcome multi-channel fading.
因此，如何提高系统的传输性能和采用何种方案对抗信道的多径效应是很有关系的。
Therefore, how to enhance the transportation performance of the system is closely related to the scheme adopted for countermining the channel multi-path effect.
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.
该方法能准确地进行多径传输情况下的时间延时估计，有效地抑制干扰和噪声的影响。
Multi path time delays are estimated precisely with this approach, and disturbances and noises can be refrained effectively.
本文在瑞利衰落模型下，研究了高频电离层信道中多径时延与多普勒频移的随机特性。
In this paper, with Rayleigh fading the random characteristics of multipath time delay and Doppler shift in HF ionospheric channels is discussed.
当采用相关法估计时间延迟时，多径时延的分辨率受到相关函数主(？)宽度的限制。
Multipath time delay estimation is constrained by the width of the signal correlation function when using correlation method.
他能有效地对抗多径效应，消除符号间干扰，对抗频率选择性衰落，而且信道利用率高。
It can waken the multipath effect availably, eliminate symbol interference and fight against frequency select fading. Moreover, the channel utilization rate is high.
对实测数据的分析结果表明，分形模型与传统的统计模型相比能更精确地描述多径衰落信号。
Simulation results from practical measured signals demonstrate that the fractal model can describe multipath fading signals more accurately compared to the conventional statistical models.
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.
论文研究了基于多径时延跟踪的信道估计方法，并提出了一种低复杂度的多径时延跟踪方法。
We investigate the channel estimation algorithms based on tracking multipath time delay, a low complexity multipath time delay estimation method is proposed.
脉冲超宽带(IR - UWB)信号在密集多径环境中存在严重的时间弥散，会产生波形失真。
In dense multipath environments, IR-UWB (impulse Radio-Ultra Wideband) signals suffer from severe time dispersion which distorts the impulse wave.
但是这种正交性却被多径衰落信道破坏，产生了多码道干扰，严重影响了系统高速传输数据的性能。
The orthogonality, however, is impaired by multipath fading channels, thus causing multicode interference (MCI) and deteriorating the system's performance at high data transmission rates.
为了减小水声通信系统中存在的由于多径传播效应引起的符号间干扰，可在系统中使用线性均衡器。
To induce inter symbol interference which is due to multipath transmit effect in the water acoustic communication system, linear equalization can be adopted in the system.
为了减小水声通信系统中存在的由于多径传播效应引起的符号间干扰，可在系统中使用线性均衡器。
To induce inter symbol interference which is due to multipath transmit effect in the water acoustic communication system, linear equalization can be adopted in the system.
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