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时延扩展     
相关语句
  delay spread
     MDL-based root-mean-squared delay spread estimation for MIMO OFDM systems
     MIMO OFDM系统中基于MDL准则的均方根时延扩展估计(英文)
短句来源
     This system can implement 4.86 Mbps data rate and tolerate 2.5μs time delay spread.
     该系统在2MHz的频率带宽内,数据通信速率最高可达4.86Mbps,可以容忍的时延扩展为2.5μs.
短句来源
     In the approach that based on the detection of DOA(Direction-Of-Arrival) of users, the spatial smooth MUSIC、L times rotate TLS ESPRIT and spatial smooth MUSIC based on ILSP-CMA algorithms are compared in terms of the performance in the environment of multipath time delay spread、spatial spread and performance effected by SNR.
     在基于DOA(Direction-Of-Arrival)检测的方案中,主要研究对比了空间平滑MUSIC、L次平移TLS ESPRIT和基于ILSP-CMA的空间平滑MUSIC三种算法在时延扩展、空间扩展和不同信噪比下的性能。
短句来源
     Its channel capacity expression in the case of time delay spread is presented. And the emulation to compare MIMO system to MIMO+OFDM system's capacity in interfered case is carried on.
     最后对MIMO+OFDM技术进行了研究,给出了MIMO+OFDM技术在时延扩展情况下的信道容量表达式,并对MIMO系统和MIMO+OFDM系统在受干扰情况下的容量进行了仿真比较。
短句来源
     This paper studies the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems.
     研究了MIMO OFDM系统中最小描述长度(MDL)准则在均方根时延扩展估计中的应用.
短句来源
更多       
  time delay spread
     This system can implement 4.86 Mbps data rate and tolerate 2.5μs time delay spread.
     该系统在2MHz的频率带宽内,数据通信速率最高可达4.86Mbps,可以容忍的时延扩展为2.5μs.
短句来源
     In the approach that based on the detection of DOA(Direction-Of-Arrival) of users, the spatial smooth MUSIC、L times rotate TLS ESPRIT and spatial smooth MUSIC based on ILSP-CMA algorithms are compared in terms of the performance in the environment of multipath time delay spread、spatial spread and performance effected by SNR.
     在基于DOA(Direction-Of-Arrival)检测的方案中,主要研究对比了空间平滑MUSIC、L次平移TLS ESPRIT和基于ILSP-CMA的空间平滑MUSIC三种算法在时延扩展、空间扩展和不同信噪比下的性能。
短句来源
     Its channel capacity expression in the case of time delay spread is presented. And the emulation to compare MIMO system to MIMO+OFDM system's capacity in interfered case is carried on.
     最后对MIMO+OFDM技术进行了研究,给出了MIMO+OFDM技术在时延扩展情况下的信道容量表达式,并对MIMO系统和MIMO+OFDM系统在受干扰情况下的容量进行了仿真比较。
短句来源
     This paper presents a partially connected neural equalizer for the GSM system, in which the complexity is linearly proportional to the time delay spread.
     本文给出了一种适用于GSM系统的部分连接神经网络均衡器,其复杂度与信道的时延扩展成正比,特别适用于具有较大时延扩展的恶劣信道。
短句来源
     The smart antenna is able to improve SINR significantly and reduce time delay spread and multipath fading at the same time.
     自适应阵列天线在近年来被称为“智能天线”,它能够显著提高系统的信号干扰噪声比(SINR),能够减小时延扩展及多径衰落,实现空分多址。
短句来源
更多       
  delay spreads
     The rms delay spreads are found generally less than 22ns and 103ns for the tunnel under empty and occupied conditions, respectively, which indicates that tunnel channels have a broad coherent bandwidth, and can support the data rate up to one megabits per second without equalization.
     研究表明:在隧道全空和有障碍物时,Rms时延扩展分别不大于22ns和103ns。 由此可知,隧道无线电波具有较宽的相关带宽,即使不进行补偿,也可支持每秒1Mbit的数据率。
短句来源
  “时延扩展”译为未确定词的双语例句
     Based on the statistical property of the non-line of sight(NLOS) propagation in the mobile communication environment,a data process method was presented to improve the position location accuracy of the time-of-arrival(TOA).
     基于移动通信环境中非视距NLOS(Non-Line of Sight)传播时延扩展服从指数分布的特性,提出了提高波达时间TOA(Time of Arrival)定位方法精度的一种数据处理方法.
短句来源
     Based on the research and simulation of OFDM system and the existing channel estimation methods, a low-dimensional Kalman filter method based on pilot signals is presented for the channel estimation of OFDM systems with large number of carriers in Beyond 3 Generation (B3G) outdoor environment.
     针对B3G(Beyond 3 Generation)室外环境的大时延扩展和时间频率选择性衰落,提出了适用于较大载波数的OFDM系统的一种基于导频辅助的低维KALMAN滤波的信道估计算法。
短句来源
     In receiver, Orthogonal Frequency Division Multiplexing (OFDM) system can easily cancel ISI and equalize frequency-selective fadings that are both caused by time disperse of radio channel.
     而在消除符号间干扰和均衡由无线信道时延扩展引起的频率选择性衰落方面,正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术具有明显优势。
短句来源
     But in TDD-CDMA system, there are many problems to solve including multipath fading, perspective effect, multiple access interference which influence its capacity and quality of service.
     同其它CDMA系统一样,TDD CDMA系统在无线传输中仍然存在着多径衰落、时延扩展、远近效应、多址干扰等问题,直接影响了系统的容量和服务质量。
短句来源
     2. Create the practical wireless time-space channel model andconsider the condition of timedelay spre4 angle spre4 Doppler fi~quency spread and rayleighfading.
     2.建立了接近实际情况的无线通信空时信道模型,考虑了:时延扩展、角度扩展、
短句来源
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  delay spread
A series of simulations have been carried out on the BER performance as a function of GI, maximum delay spread, and Signal-to-Noise Ratio (SNR), with QPSK as modulation scheme over multipath fading and Additive White Gaussian Noise (AWGN).
      
The results show that the optimum values of the GI parameter approximately equal to the maximum delay spread, and the proposed system with VGI provides a better performance compared with the fixed length GI.
      
The validity of the new formula is verified and the effects of correlations, delay spread as well as the number of subcarriers on the ergodic capacity are evaluated via Monte Carlo simulations.
      
The developed model can be used to predict both wideband, e.g., angle and delay spread, and narrowband, e.g., path loss, propagation characteristics in a city street with any number of crossing streets of different widths.
      
An analytical statistical model for the RMS delay spread parameter in millimeter frequencies
      
更多          
  time delay spread
The analysis of the average measured power delay profiles reveals that the rms time delay spread is less than 25 ns when the tunnel is empty and can be as large as 103 ns when the tunnel is blocked by vehicles.
      
Frequency domain correlations between OFDM sub-bands are determined by the time delay spread.
      
This channel simulator must be capable of reproducing authentic multipath propagation and time delay spread fading effects.
      
The effects of time delay spread on portable radio communications channels with digital modulation.
      
  power delay profile
The trade off between symbol spaced and fractionally spaced equalisation is considered together with the importance of feedfoward and feedback synchronisation to the channel's power delay profile.
      
For the indoor multipath channel with exponentially decaying power delay profile, the performance enhancement is compared for several antenna combining schemes.
      
On the Use of Wavelet-Based Denoising to Improve Power Delay Profile Estimates from 1.8 GHz Indoor Wideband Measurements
      
A random matrix model for the antenna array channel with decaying power delay profile.
      
A uniform power delay profile is used with a number of paths equal to 2.
      
更多          
  其他


This paper describes a new underwater acoustic communication system which is performed in the multipath channel. The multi-dimensional channel coding technique which uses the signal pattern and the information source coding technique which uses the shift of signal time-delay have been combined in the signal code design. So that, the system could have high ability of anti-interference of multipath arrives, and obtain a high data ratio. In the first experiment at a reservoir, successful transmission of 200 bits/s...

This paper describes a new underwater acoustic communication system which is performed in the multipath channel. The multi-dimensional channel coding technique which uses the signal pattern and the information source coding technique which uses the shift of signal time-delay have been combined in the signal code design. So that, the system could have high ability of anti-interference of multipath arrives, and obtain a high data ratio. In the first experiment at a reservoir, successful transmission of 200 bits/s over a 1 km horizontal path was achieved.

本文提出了一种针对海洋水声信道多途干扰的新的水声通信体制.它将利用信号码元波形参数进行多维信道编码技术和利用信号码元时延值进行信息编码技术融于信号码元的设计中,从而使得本方案具有很强的抗多途时延扩展能力,并可望获得相当高的通信速率.初步的湖上试验结果表明:在1公里左右的水平通信距离上,可靠的通信速率约为200bit/s

Channel equalization is essential in the Pan-European GSM mobile communication system. The Maximum Likelihood Sequence Estimation (MLSE) using the Viterbi Algorithm (VA) is commonly recommended for the equalization, which can only accommodate the channels with limited time delay spread. This paper presents a partially connected neural equalizer for the GSM system, in which the complexity is linearly proportional to the time delay spread. For the purpose of effectively eliminating the performance degradation...

Channel equalization is essential in the Pan-European GSM mobile communication system. The Maximum Likelihood Sequence Estimation (MLSE) using the Viterbi Algorithm (VA) is commonly recommended for the equalization, which can only accommodate the channels with limited time delay spread. This paper presents a partially connected neural equalizer for the GSM system, in which the complexity is linearly proportional to the time delay spread. For the purpose of effectively eliminating the performance degradation due to existence Of local minima, the Mean-Field-Annealing (MFA) technique is introduced. The present approach is well suited for digital or analog VLSI implementations and can converge in a very short time period. Computation simulations show that our approach can provide performance improvement over 16-state and 32-state VA's which are usually suggested for practical applications.

在泛欧GSM移动通信系统中,由于存在码间干扰,必须采用信道均衡技术。常用的最大似然序列估计(MLSE)均衡器采用维特比算法(VA),它只能用于具有较小时延扩展的信道。本文给出了一种适用于GSM系统的部分连接神经网络均衡器,其复杂度与信道的时延扩展成正比,特别适用于具有较大时延扩展的恶劣信道。为了消除神经网络局部极小点引起的性能恶化,我们采用了均场退火技术。本文提出的均衡器既适于用模拟集成电路实现,又适于用数字集成电路实现。计算机仿真表明本文的方法具有比最常用的16状态和32状态VA更好的性能。

The multipath fading channel under different environments is simulated by the channel model at first. Sequentially the simulation of the Viterbi equalization demodulation algorithm is carried out by software. The following factors are considered: Rayleigh fading, delay spread, doppler frequency shift, co channel interference, additive white Gaussian noise,etc. The result of the simulation is the relationship between the BER before channel decoding in the GSM network and the C/I under the typical urban...

The multipath fading channel under different environments is simulated by the channel model at first. Sequentially the simulation of the Viterbi equalization demodulation algorithm is carried out by software. The following factors are considered: Rayleigh fading, delay spread, doppler frequency shift, co channel interference, additive white Gaussian noise,etc. The result of the simulation is the relationship between the BER before channel decoding in the GSM network and the C/I under the typical urban environments. At last the formula of the predicted BER is given, and the effect of the traffic is also involved. Both the results and the methods used in this article have positive sense in an integrated scheme of digital mobile communication network planning.

在数字移动通信网络规划中,希望能对网络服务区内的信号接收质量进行预测,并尽可能减少大量的实测工作.文中以GSM网络为背景,首先通过一定的信道模型完成了对不同环境下的多径衰落信道的模拟,然后利用软件模拟接收端对GMSK信号的Viterbi解调,综合考虑了瑞利衰落、阴影衰落、时延扩展、高斯白噪声及同频干扰对误码率的影响.模拟所得的结果是GSM系统中典型市区环境下信道解码前对误码率与载干比的关系.最后在考虑了话务量对误码率的影响以后,提出了误码率的预测公式,从而实现了对GSM网络接收质量的预测.

 
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