Description: 随着无线mesh网络的普及，其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题，比如带宽降低，无线干扰以及网络时延等。譬如，在网络中的每一跳吞吐量会下降多达50％，连续多跳情况下吞吐量下降得更迅速，其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下，时延和RF干扰将达到不可接受的程度，而导致连接完全中断-wireless mesh network with the popularity of its size and complexity of sustainable development. However, multi-hop mesh networks encountered more and more problems, such as lower bandwidth, wireless interference and network delay, and so on. For example, in each of the network throughput would drop jump up to 50%, for a number of cases jumped more rapid decline in throughput, The results will lead to serious network performance lower. In voice and video applications running of a large number of extreme cases, delay and RF interference will reach an unacceptable level. which led to the link severed Platform: |
Size: 208896 |
Author:wolfguy |
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Description: 根据有无固定基础设施，无线局域网又可分为BSS (Basic Service Set)和IBSS (Independent Basic Service Set)。我们要研究的ad hoc网络属于后者。假设在一个ad hoc网络中，移动节点的发射功率PTx总是恒定的。要发送数据的移动节点总是先监听信道，测量接收到的信号功率X，其中X= I + N, I为接收到的干扰，N是噪声。移动节点只有在X＜INThre时，才可以发射。式中，INThre为背景噪声门限。
在仿真中，我们规定每个移动节点的发射功率是常数，PTx = 1W；接收节点接收机的灵敏度Smin = -80 dBm；信号质量 min = 2 dB；系统的背景噪声门限INThre = 1.2e-10。
-According to the availability of fixed infrastructure, wireless local area network can be divided into BSS (Basic Service Set) and IBSS (Independent Basic Service Set). We have to study the ad hoc network belong to the latter. Assuming in an ad hoc network, mobile node s transmission power is always constant PTX. To send data to the mobile node always monitor channel, measuring the received signal power X, which X = I+ N, I was received interference, N is the noise. Mobile node only when X <INThre when it is fired. Where, INThre threshold for background noise. In the simulation, we require that each mobile node s transmission power is constant, PTx = 1W receiver node receiver sensitivity Smin =-80 dBm signal quality Platform: |
Size: 7168 |
Author:何炳钦 |
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Description: 把地理区域分成一个个小区，蜂窝系统在该区域内提供无线覆盖。把可用的频谱分成很多信道，每个小区分配一组信道。使用频分双工（FDD）。在小区间进行频率利用，N个小区构成一个簇，簇间进行频率复用。定义了传播特性（信道参数）以及同频小区的位置。信道的参数包括：小区半径，路径损耗指数，以分贝为单位的对数正态阴影的标准差，基站发射功率级，移动台发射功率级，每个小区的扇区数，扇区化天线的正反向比，要仿真的瞬时位置的组数，同频干扰阈值。-To a geographical area is divided into small areas, cellular systems in the region to provide wireless coverage. The available spectrum is divided into multi-channel, each plot the distribution of a group of channels. The use of frequency division duplex (FDD). In the district between the frequency of use, N plots constitute a cluster, cluster between frequency reuse. The definition of the propagation characteristics (channel parameters), as well as with the frequency of residential location. Channel parameters include: cell radius, path loss index to decibels for units Lognormal shadow of the standard deviation, the base station transmitter power level, mobile station transmitting power level, the number of sectors in each district, sector of the antenna the pros and cons to the ratio, to the transient simulation of the group a few positions, the same frequency interference threshold. Platform: |
Size: 2048 |
Author:mame |
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Description: 无线光通信技术具有通信容量大、传输速率高等众多优点, 在许多场合都有重要的应用, 是现代通信技术研究的一个热点。由于脉冲位置调制 ( PPM ) 有较高的平均功率利用率和抗干扰能力, 故 PPM是无线光通信系统中常用的调制方式。在研究 PPM调制技术的基础上, 就基于 FPG A的无线光通信 PPM调制系统进行设计, 并用 V H D L语言完成了系统的设计和仿真。仿真结果表明, 该设计具有正确性和合理性。-Wireless optical communication technology has the communications capacity, many of the benefits of higher transmission rates, in many occasions have important applications in modern communication technologies are a hot research. Because of pulse position modulation (PPM) have a higher average power utilization and anti-interference ability, so PPM is a wireless optical communication system commonly used in modulation. PPM modulation technique in the study on the basis of FPG A based on wireless optical communication PPM modulation system design, and VHDL language achieve the system design and simulation. Simulation results show that the rationality of the design right. Platform: |
Size: 194560 |
Author:朱雯 |
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Description: 稳健自适应波束形成，Wiley出版社，是一本有关MVDR波束形成稳健性分析的好书。-The latest research and developments in robust adaptive beamforming Recent work has made great strides toward devising robust adaptive beamformers that vastly improve signal strength against background noise and directional interference. This dynamic technology has diverse applications, including radar, sonar, acoustics, astronomy, seismology, communications, and medical imaging. There are also exciting emerging applications such as smart antennas for wireless communications, handheld ultrasound imaging systems, and directional hearing aids. Robust Adaptive Beamforming compiles the theories and work of leading researchers investigating various approaches in one comprehensive volume. Unlike previous efforts, these pioneering studies are based on theories that use an uncertainty set of the array steering vector. The researchers define their theories, explain their methodologies, and present their conclusions. Methods presented include: Coupling the standard Capon beamformers with a spher Platform: |
Size: 8313856 |
Author:qc |
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Description: 本论文以OFDM系统为基础，介绍了OFDM系统的基本原理，以及使用OFDM技术的优势所在，并且展望了今后的无线移动技术的发展前景。在简单介绍OFDM原理的同时，着重阐述了OFDM系统在不同信道环境和不同实现方式下的误码性能。主要包括了OFDM系统在加性白高斯信道，在加性白高斯信道和多径干扰两种不同信道环境下系统的误码性能，其中后者还研究了系统在有保护间隔与无保护间隔的误码性能比较。在理论分析的基础上，用MATLAB进行仿真，最后做出误码性能的分析和比较。 -This paper has OFDM systems based on OFDM systems introduces the basic principles and the use of the advantages of OFDM technology, and to look towards the future of wireless mobile technology development prospects. In a brief OFDM principles, while focusing on the OFDM system under different channel environments and different modes to achieve the error performance. Mainly include the OFDM system in additive white Gaussian channel, in the additive white Gaussian channel and multi-path interference of two different channel environment, the system BER performance, the latter of which also studied the system in a guard interval and non-protected BER performance comparison interval. The theoretical basis of the analysis, using MATLAB simulation, finally make a bit error performance analysis and comparison. Platform: |
Size: 1953792 |
Author:王斌 |
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Description: 该文件中有大量有关无线传感器网络方面的相关论文，有加权组合三边气体源定位算法、分布式射频干涉定位法、以及人工神经网络定位等方面的论文。希望对研究无线传感器网络的朋友们有所帮助。-The document contains a lot of information related to wireless sensor networks, papers, there is a weighted combination of the trilateral gas source localization algorithm, distributed radio frequency interference positioning method, and artificial neural network location, etc. papers. Hope that the study of wireless sensor networks, friends help. Platform: |
Size: 7187456 |
Author:丁杰 |
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Description: INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDM SYSTEMS:
Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multi-carrier modulation scheme, which has been adopted for several wireless standards such as IEEE 802.11a and HiperLAN2. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This frequency offset introduces inter-carrier interference (ICI) in the OFDM symbol. This project investigates three methods for combating the effects of ICI: ICI self-cancellation (SC), maximum likelihood (ML) estimation, and extended Kalman filter (EKF) method. These three methods are compared in terms of bit error rate performance, bandwidth efficiency, and computational complexity. Through simulations, it is shown that the three techniques are effective in mitigating the effects of ICI. For high values of the frequency offset and for higher order modulation schemes, the ML and EKF methods perform better than the SC method. Platform: |
Size: 390144 |
Author:redami |
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Description: 本文档是调频发射机与调频接收机的设计报告。介绍了调频无线通信系统的原理计算、性能指标、设计方案、调试过程等内容，是通信基本电路实验的系统性总结。该系统分为发射机和接收机两部分。调频发射机由振荡级，缓冲级，功放级组成，级联并采用变容二极管部分接入电路的方法进行直接调频。调频接收机为以SONY公司的CXA1619BM/BS芯片为核心元件的电路。本系统可实现5～10米内调频数据、语音通信功能。-This document is the design report of a FM transmitter and a FM receiver. It describes the FM wireless communication systems theory, performance, design, and debug processes, which a systemic summary of the course Experiment of Basic Circuit of Communication. The system is divided into two parts transmitter and receiver. The FM transmitter consists of a oscillator, a buffer and a power amplifier, which uses a varactor diode for directly FM, with three circuits cascaded. The receiver is accomplished with the core chip CXA1619BM/BS by SONY. The system can perform a 5 to 10 meters FM data and voice communication. Platform: |
Size: 1762304 |
Author:CXJ |
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Description: 正交频分复用技术是近年来发展起来的新技术,在高速无线数据传输领域有很大的应用前景。文章在分析和总结相关文献的基础上,介绍了正交频分复用(OFDM)技术的发展历史,讨论了正交频分复用技术的基本原理和实现方法。通过分析表明,在高速无线通信中OFDM对于消除符号间干扰(ISI),降低系统的复杂度等方面具有很大优势。正交频分复用(OFDM)是一种多载波宽带数字调制技术,它能有效地克服传输中的多径干扰和消除码间串扰,适合于高速率的地面信道视频传输。本文就OFDM技术进行了较为详尽的分析,并对OFDM的传输特性进行了基于FFT算法实现的MATLAB软件模拟及模拟结果分析。 -OFDM is a new technology developed in recent years, high-speed wireless data transmission in the field of great applications. This paper analyzes and summarizes the basis of relevant literature, describes orthogonal frequency division multiplexing (OFDM) technology, history, orthogonal frequency division multiplexing discussed the basic principles and implementation methods. The analysis shows that in the high-speed wireless communication in OFDM symbol for the elimination of interference (ISI), and so reduce the complexity of the system has great advantages. Orthogonal frequency division multiplexing (OFDM) is a multi-carrier wideband digital modulation techniques, can effectively overcome the transmission of multi-path interference and the elimination of intersymbol interference, the ground for high-speed video transmission channel. In this paper, OFDM technology, a more detailed analysis, and transmission characteristics of OFDM FFT algorithm based on the MATLAB software simulation Platform: |
Size: 71680 |
Author:罗萍 |
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Description: 关于认知无线电方面的创新性文献，解释清晰，对于认知无线电资源分配/功率分配方面的知识有很好的启发性-On cognitive radio innovations in literature, a clear explanation for the cognitive radio resource allocation/power distribution has a good knowledge of inspiring Platform: |
Size: 430080 |
Author:张雪雪 |
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Description: WCDMA数字频域干扰抵消器，绝对的高手写的文档和代码，里面资料齐全方便自学，是很好的学习FPGA实现无线通信模块的资料。-WCDMA Frequency Domain Interference Cancellation figures, the absolute master of written documentation and code, which complete information to facilitate self-learning, is a very good learning FPGA implementation of wireless communications and information. Platform: |
Size: 2325504 |
Author:lrj |
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Description: 传统均衡器无法有效地同时对抗这两种信道衰落，而Turbo均衡技术作为一种联合信道均衡和信道译码的方法，能有效地对抗符号间干扰（ISI），提供迭代增益，提高接收机的整体性能。因此，本文根据下一代无线通信系统的设计要求，分别对单载波和OFDM系统的Turbo均衡算法进行了研究。
-Conventional equalizer can not effectively fight both at the same time fading, while the Turbo equalization as a joint channel equalization and channel decoding method is robust against inter-symbol interference (ISI), provides iteration gain, improved receiver overall performance. Therefore, this next-generation wireless communication system according to the design requirements, namely, the single carrier and OFDM systems Turbo equalization algorithm is studied. Platform: |
Size: 703488 |
Author:w |
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Description: 《通信系统仿真原理与无线应用》系统地介绍通信系统的设计、分析和仿真方法，还提供了大量极具参考价值的仿真实例。《通信系统仿真原理与无线应用》的全部仿真程序都是采用MATLAB编写的。这不仅方便读者理解仿真的实现过程，还允许读者修改或使用这些代码段来进行自己的仿真开发。章后提供了大量的参考文献和经过精心设计的各类练习题，方便教学。
此为英文原版书籍-Principles of Communication Systems Simulation with Wireless Applications is a hands-on, example-rich guide to simulating wireless communications systems. The first book to present complete MATLAB simulation models for predicting the impact of design changes, it treats every aspect of simulation: sampling, signal and system representations, filters, noise, Monte Carlo simulation, postprocessing, nonlinear and time-varying systems, waveform and discrete channels, co-channel interference, and more. It includes four detailed case studies. Platform: |
Size: 6778880 |
Author:罗飞 |
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Description: NRF905无线通信芯片基础上，特做优化设计高性能低功耗，接收灵敏度高，抗干扰性强，集成度高，通信稳定-NRF905 wireless communication chip based on the design of special to do to optimize high-performance low-power, receiver sensitivity, immunity to interference, high integration, communication and stability Platform: |
Size: 11363328 |
Author:李浩 |
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Description: Part I presents the fundamental concepts andMATLAB programs for simulation of wireless
channel modeling techniques, including large-scale fading, small-scale fading, indoor and
outdoor channel modeling, SISO channel modeling, and MIMO channel modeling. Platform: |
Size: 366592 |
Author:Estifanos Yohannes |
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Description: 模拟行人在六角形基站中行走时，通信信号的强弱，各个基站对他的干扰-Analog pedestrians walking in the hexagonal base station communication signal strength, interference of each base station Platform: |
Size: 4096 |
Author:Ding GUo |
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Search - interference wireless