Diversity is an effective technique on combating channel fading in mobile communications.
在移动通信中，分集技术是一种最有效的抗衰落技术。
In wireless communication system, channel fading can decrease the reliability of communications.
在无线移动通信系统中，信道的衰落会降低信号传输的可靠性。
The performance of downlink CDMA systems is influenced by channel fading and multi-access interference.
CD MA下行链路的性能受到信道衰落和多址干扰的影响。
Secondly, we propose a new method based on hidden Markov models and video images to predict channel fading.
其次，我们基于隐藏式马尔可夫模型与影像讯号提出了一个新的通道衰落预测方法。
It can be used in multipath channels to suppress multi-address interference and overcome multi-channel fading.
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。
This paper presented a model about the channel fading in the indoor physical environment of the wireless sensor networks.
通过实践应用证明，此衰落模型在实际网络的节点部署和节点定位中的作用优于其他无线信道衰落模型。
Furthermore, we conclude that the channel fading correlation has nothing to do with diversity advantage, but the code advantage will be affected.
得出分集增益不受信道相关性的影响，但是编码增益则有一定的损耗的结论。
We studied the performances of this system by simulations, including the impacts of channel fading, angle spread and co-channel interference on DOA estimation.
通过仿真，研究了这一系统在移动通信环境下的性能，包括信道衰落、信号角度扩散及同频干扰用户等对DOA估计的影响。
It is well accepted that spatial, or multiple-antenna, diversity is an efficient technique to combat the negative effects of channel fading in wireless networks.
多天线空间分集技术是抵抗无线信道衰落的有效手段。
In particular, a large number of propagation paths between transmit and receive antennas can be utilized to combat channel fading effect and gain link reliability.
特别地，能够利用发送天线和接收天线之间的多径分量来抵抗信道衰落影响，并且改善通信链路可靠性。
It is a true blind detection algorithm in that it needs no knowledge of channel fading information as well as time domain and frequency domain spread spectrum codes.
该算法无需时域扩频码、频域扩频码和信道衰落信息，是一种真正意义上的盲的检测算法。
Simulation results demonstrate that the proposed method offers higher detecting performance and is capable of combating both channel fading and multiple-access interference.
仿真结果验证了本文方法具有良好的检测性能，可以在克服信道衰落的同时抑制多址干扰。
A novel approach is proposed for linear multi user detection in conjunction with transmit diversity to combat channel fading, multi user interference and inter symbol interference.
提出了一种将线性多用户检测与发射分集相结合的新方法，该方法能在克服信道衰落的同时抑制多址干扰和码间串扰。
In CDMA mobile communication systems, multiple access interference can be cancelled by multiuser detection technique. The degradation by channel fading can be reduced by diversity reception.
在CD MA移动通信系统中，多址接入干扰可以通过多用户检测技术来消除，而分集接收可以减小信道衰落的影响。
Albeit reasonable for wireline links, adaptive transmissions based on perfect channel state information (CSI) in wireless systems can be justified only when the channel fading is sufficiently slow.
合理的有线链接，自适应传输只是慢的基础上完善的信道状态信息(CSI)在无线系统，可以合理的信道衰落时，才足够缓慢。
This paper investigates blind space-time interference suppression for MultiCarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel.
该文研究在频率选择性瑞利衰落信道中MC-CDMA系统的盲空时干扰抑制。
In this paper, a blind multiuser receiver for frequency-selective fading channel based on subspace tracking has been presented.
提出一种基于信号子空间估计，用于频率选择性衰落信道的盲多用户自适应接收机。
The space-time channel estimation and multiuser detection algorithm for the uplink of multicarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel were investigated.
研究了频率选择性瑞利衰落信道中的同步MC-CDMA系统上行链路空时信道估计及多用户检测算法。
The second chapter of this paper analyzes the multipath effects and fading effects of wireless channel.
第二章分析了无线信道的多径效应和小尺度衰落效应。
This paper investigates blind multiuser detection for asynchronous DS-CDMA in frequency selective Rayleigh fading channel.
该文研究了频率选择性瑞利衰落信道中的异步ds - CD MA系统盲多用户检测。
As some examples, the results of some TCM signal sequence on additive Gaussian white noise (AWGN) channel and fading channels have been presented.
作为实例，给出了高斯信道和衰落信道上的一些TCM信号序列的自由空间距离的计算结果。
The mean acquisition time of the FSASE method is derived by the generating function flow graph technique for the fading channel.
文中采用生成函数流图法推导出了衰落信道下FSASE算法平均捕获时间的闭式解。
Therefore, system acquisition performance can be improved if diversity receiver is adopted for the frequency-selective fading channel.
因此在频率选择性衰落信道中，采用分集接收可以改善系统的捕获性能。
Therefore a diversity gain can be obtained in a broadband fading channel.
因此，在宽带衰落信道中可获得分集增益。
Then it analyzes the wireless mobile communication propagation environment and gets the characters of timing varying fading channel.
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。
The study shows that the algorithm can complete frequency offset tracking in AWGN channel and multipath fading channel.
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。
Thus the estimation accuracy can be improved distinctly in fast fading channel.
很好的改善快衰落信道估计的准确性。
The first chapter introduced the characteristics of the wireless channel, the small-scale fading model, multi-path fading model and WSSUS channel model.
本文第一章绪论首先分析了无线信道的特性，介绍了小尺度衰落模型，多径衰落模型以及WSSUS信道模型。
Considering Rayleigh fading channel is random channel, noncoherent detection is used for channel estimation.
考虑到瑞利衰落信道为随机信道，用非相干检测对信道进行估计。
Considering Rayleigh fading channel is random channel, noncoherent detection is used for channel estimation.
考虑到瑞利衰落信道为随机信道，用非相干检测对信道进行估计。
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