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Description: 对于移动通信系统主要有两类衰落：大规模衰落和小规模衰落。大规模衰落表示由于大范围内移动而引起的平均信号能量的减少或路径损耗。而小规模衰落则表现为两种机制：信号的时延扩展和信道的时变特性。对于无线应用，信道的时变特性是由于发射机和接收机相对移动而造成传输路径的变化。这些传播条件的变化速率影响衰落率。如果存在大量反射路径而不存在视行信号分量，此时的小规模衰落称为瑞利衰落(Rayleigh fading)，接收信号的包络由瑞利概率分布函数统计描述。这种衰落也就是这次实验我准备研究的-system for mobile communications fading there are two main categories : large-scale and small-scale fading fading. In view of large-scale decline of large scale movement of the average energy of the signal path to reduce or loss. And the decline of small-scale, it was manifested as two mechanisms : signal delay expansion and channel time-varying characteristics. For wireless applications, channel time-varying characteristics as transmitter and receiver relative movement caused transmission path changes. These conditions spread of the rate changes affect the rate of decline. If there is a large number of pathways exist without depending on the signaling component, At that time, the decline of small-scale known as Rayleigh fading (Rayleigh fading). The received signal envelope from Rayleigh
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Size: 20480 |
Author: 赵景 |
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Description: ofdm仿真程序有关信道传输中的多径效应，多普勒频移，时延扩展-OFDM simulation program on the transmission channel of multi-path effects, Doppler frequency shift, delay spread
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Size: 1024 |
Author: 时光 |
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Description:
应用OFDM可以有效地对抗多径时延扩展。循环前缀不仅可以消除符号间干扰（ISI），还能消除子载波间干扰（ICI).本项目完整地仿真了OFDM系统。-Application of OFDM can effectively combat multipath delay spread. Cyclic prefix can not only eliminate inter-symbol interference (ISI), can eliminate Inter-carrier interference (ICI). This project a complete simulation of the OFDM system.
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Size: 41984 |
Author: 吏继斌 |
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Description: In this thesis a signal level simulator in uplink is implemented according to the physical layer specification of the IMT-2000 WCDMA system. The analytical WCDMA system through the use of linear algebra techniques is shown. Channel model is built on the classical understanding of fading, Doppler spread, delay spread, and incorporate additional concepts such as direction of arrival and antenna array geometry. PN sequence properties and generation are studied. Spreading and scrambling techniques are present. RAKE receiver and multiuser detection are described, and spatial processing in smart antenna are reviewed. A simulation tool in Matlab is developed in this work.
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Size: 562176 |
Author: mansoor |
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Description: 该压缩包包括两个m文件，一个为IEEE推荐的UWB信道模型的matlab仿真程序，另一个为对应的RMS时延扩展计算，并附带了一个文档文件作说明。-The archive includes two m files, one for the IEEE UWB channel model recommended by the matlab simulation program, and the other for the corresponding calculation of RMS delay spread, and comes with a document file for instructions.
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Size: 4096 |
Author: 杨扬 |
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Description:
This program used to show the the effects of delay spread in MC_CDMA Transceiver systems.-
This program used to show the the effects of delay spread in MC_CDMA Transceiver systems.
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Size: 2048 |
Author: amare |
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Description: CDMA扩频通信在多径时延展宽作用下的误码特性-CDMA spread spectrum communication in multipath time delay spread of the BER performance under
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Size: 62464 |
Author: dukeliu |
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Description: Pilot symbol assisted modulation and differential detection in fading and delay spread
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Size: 470016 |
Author: Lakmali |
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Description: 本matlab文档进行了LTE系统中对于无线信道的参数均方根时延扩展的具体计算方法，将多径信道中的各路时延与参数rms联系起来。-The matlab document the LTE system, the parameters for the wireless channel rms delay spread of the specific calculation method, the multipath channel parameters of the brightest and the rms delay link.
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Size: 2048 |
Author: songhaibei |
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Description: 计算无线衰落信道平均时延扩展和均方根时延扩展-delay spread and square delay spread calculation code
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Size: 1024 |
Author: 王秋才 |
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Description: 16QAM调制信号经过多径信道时延分别为0、8和20个采样点下，比较空白前缀与循环前缀下的性能。-16QAM modulation signal through the multipath channel delay were 0,8 and 20 sampling points, compare the performance blank prefix and the cyclic prefix.
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Size: 1024 |
Author: 邹家畅 |
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Description: 通信原理matlab仿真时延扩展仿真适用各种环境-Communication Principles Simulation of delay spread matlab simulation for a variety of environments
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Size: 1024 |
Author: 刘闫 |
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Description: The simulation is concerned with BER (bit error rate) in systems that used OFDM technique through different channels effects (delay spread & Fading) and with different modulation schemes. And showing the effect of used modulation scheme in the same channel and its effect on BER
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Size: 14336 |
Author: mohamed |
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Description: 衰落是由于发射机与接收机之间空间位置的微小变化引起的，描述小范围内接收信号场强中瞬时值的快速变化特性，是由多径传播和多普勒频移两者共同作用的结果，包括由多径效应引起的衰落和信道时变性引起的衰落，具有信号的多径时延扩展特性和信道的时变特性-Fading is caused due to a slight change of the position of the space between the transmitter and the receiver, the characteristics of the receiving signal field strength, the instantaneous value of the rapid changes in the description within, by multipath propagation and Doppler frequency shift of the joint action of botha result, time-varying fading caused by multipath effects and channel fading due to multipath delay spread characteristics and channel time-varying characteristics of the signal
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Size: 70656 |
Author: maimuyu |
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Description: OFDM can be effectively against multipath delay spread
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Size: 54272 |
Author: 宋黑 |
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Description: 室外定位基于时延扩展信道模型的五种信道环境CDF比较图-Outdoor positioning delay spread channel model based on the five channel environment CDF comparison chart
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Size: 1024 |
Author: 程猛 |
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Description: how to calculate the rms delay spread in a power delay profile
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Size: 1024 |
Author: tug |
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Description: Multi-Carrier Modulation is a technique for data-transmission where a high-bit rate data stream is divided into several parallel low bit-rate data streams and using these low bit-rate data streams to modulate several carriers. Multi-Carrier Transmission has a lot of useful properties such as delay-spread tolerance and spectrum efficiency that encourage their use in broadband communications. OFDM is a multi-carrier modulation technique with densely spaced sub-carriers that has gained a lot of popularity among the broadband community.
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Size: 6144 |
Author: jambulingam k |
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Description: 无线信道时延扩展仿真
一、仿真目的
在数字通信中，无线信道所表现出的时延扩展将有可能引起接收信号的码间串扰。实验的目的是从时域角度方面对移动信道的多径环境引起的接收信号时延扩展现象进行仿真。-wireless channel delay spread simulation
One, the simulation purpose
In digital communication, wireless channel delay spread shown will likely cause the received signal crosstalk code. The aim of the experiment is to delay the received signal due to multipath environment of mobile channel in time domain and the phenomenon of simulation.
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Size: 15360 |
Author: 理想 |
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Description: ：LTE(Long Term Evolution，长期演进)系统中的小区初始搜索过程通过分别检测主同步信号(Primary Synchronization Signal，PSS)和辅同步信号(Secondary Synchronization Signal，SSS)来完成，搜
索结果包括小区组ID、符号定时、频偏估计、组内小区ID以及帧定时[1]。然而，若接收信号 1IDN 2IDN
中存在整数倍频偏，则由于时域的相位旋转，主同步信号将很难用传统的相关算法检测到。提出一种主同步信号与整数倍频偏联合检测的方法，即使存在整数倍频偏，也能得到正确的符号定时。辅同步信号采用的是非相干的差分相关检测[2]，仿真表明，与传统的匹配滤波算法相比，可以有效的对抗信道时延扩展和载波频偏，适用于高速场景下时分双工(Time Division Duplex，TDD)LTE系统的同步。-In LTE systems, the initial cell search process is completed by detecting the primary synchroniza-tion signal and the secondary synchronization signal. The searching results include cell ID group, symbol timing, frequency offset estimation, intra group cell ID and frame timing[1]. However, if integer frequency offset presents in the received signal, due to time-domain phase rotation, the primary synchronization signal will be difficult to detected using the conventional correlation algorithm. A new joint detection method for integer frequency offset and primary synchronization signal is proposed, which can get the correct symbol timing even if the presence of integer frequency offset. Secondary synchronization signal is processed using the differential non-coherent correlation detection method[2]. Simulations show that compared with the tradi-tional matched filtering algorithms, it can effectively combat the channel delay spread and carrier frequency offset and especially suitable for
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Size: 257024 |
Author: imc_lte |
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