跪求一篇3000汉字（英译汉）的外文文献,围绕主题是 移动网络信号定位技术、 蜂窝网络定位、TDOA时间差、 到达时间TOA 相关都可以

跪求一篇3000汉字（英译汉）的外文文献,围绕主题是 移动网络信号定位技术、 蜂窝网络定位、TDOA时间差、 到达时间TOA 相关都可以
跪求一篇3000汉字（英译汉）的外文文献,围绕主题是 移动网络信号定位技术、 蜂窝网络定位、TDOA时间差、 到达时间TOA 相关都可以

跪求一篇3000汉字（英译汉）的外文文献,围绕主题是 移动网络信号定位技术、 蜂窝网络定位、TDOA时间差、 到达时间TOA 相关都可以
With the large-scale development of mobile communication technology and the coming of the 3G era, wireless location technology of cellular network is more and more mature in theory, also appeared more and more research in application, the localization technology in cellular communication system not only provides the position information service for the users, emergency assistance and goods-tracing function, in ensuring national security and crime also play an effective role. Basic principle of wireless cellular network positioning system is in a cellular network, according to the location of the mobile station (characteristic parameters such as arrival time TOA, the time difference of arrival TDOA, angle of arrival, AOA) were measured and the estimation of the location of the mobile station, the mobile location. Firstly, this paper introduces the application of the wireless location technique in cellular networks, the cellular network system and various common positioning technology are discussed. Secondly, this paper introduces the TOA positioning algorithm based on the basic principle and mathematical model of TDOA location algorithm in cellular network, analysis of the NLOS error model and its influence on the positioning system, at the same time of the traditional localization algorithm (such as Chan algorithm, Fang algorithm, Friedlander and Taylor series expansion method) were studied, too the analysis of location algorithm for a NLOS error. Finally, this paper introduces the positioning technology based on OFDM signal, introduces the positioning using OFDM signal strengths, the OFDM signal TOA estimation algorithm and localization algorithm has conducted the simulation research.AdHoc network is a self-organizing network, which has no communication infrastructure support can be communication between mobile nodes in a few. The adhoc has flexible networking, resource characteristics such as effective utilization, it will have broad application prospects in military communications, emergency communications, business application environment. However, at the same time, because of its high bit error rate, limited battery capacity, easy to be monitored and other issues, we need to constantly improve and perfect. AdHoc network is a new network, there are still a lot of problems, the realization, practical and a lot of work to do. Because the AdHoc network of multi-hop wireless transmission and the network topology changes, TCP performance than the wired network deterioration. How to solve the problem of TCP application in AdHoc network is facing an urgent problem to be solved. Now the main research direction of TCP to improve the performance of AdHoc network focus on the improvement of MAC layer, network layer, transport layer mechanisms, and improved based on the original architecture has been added a layer. TCP is the core of congestion control mechanism. The current version of TCP are mainly Tahoe, Reno, NewReno, SACK and Vegas several, and an improved scheme for wireless networks called DA. Congestion control mechanism of TahoeTCP is divided into three stages, namely, slow start, congestion avoidance, fast retransmission. Several TCP are based on TCPTahoe, but all were improved, so that TCP can run more efficiently or suitable for a particular network state. RenoTCP is currently the most widely used in the Internet version of TCP. It increases fast recovery based on Tahoe. NewRenoTCP is a small improvement in RenoTCP, it solves the RenoTCP in fast recovery of multiple packet lost problem. Selective acknowledgement (SACK) through the receiver selectivity for data validation to improve the performance of TCP, it can solve a window lost packets problem. DA is the mechanism, it is specially designed for wireless networks to improve the shared channel to do. VegasTCP has a congestion is completely different from the former five TCP control mechanism. Three kinds of technology of Vegas is mainly used to improve throughput reduces loss. Because the TCP is designed for wired networks, it is premise of effective operation of the assumption that packet loss is caused by network congestion. TCP the packet loss as network has signs of congestion, each detects a packet loss, TCP will start the congestion control mechanism, reduce the sending rate of the sender, thereby reducing the congestion degree. But in the AdHoc network, packet loss are not by network congestion. The high error rate of wireless channel, caused by node movement route interrupt, MAC layer conflicts can cause packet loss, then start the TCP congestion control is not necessary, so that the throughput of TCP significantly decreased. In order to make TCP better adapt to the AdHoc network, needs to be improved. NS is the acronym NetworkSimulator, which is composed of LBNL (LawrenceBerkeleyNationalLaboratory) network simulation tool developed by the research team. NS is an extensible, configurable, programmable event driven network simulation software. The simulation in this paper are based on the NS2. The performance of various versions of TCP in AdHoc network is simulated, and the effects of the AdHoc network is a multihop and mobile characteristics on the performance of TCP, and TCP properties of the various versions of the comparison, find out under various conditions is most suitable for AdHoc network TCP. Then the performance of the DA mechanism for wireless networks is applied to the AdHoc network has made the further analysis and put forward the improvement on it. TCP improve the performance of AdHoc network and then a variety of published literature has been proposed in the scheme are summarized and their evaluation, including the improvement of the MAC layer, to improve the network layer, to improve the transport layer, improve the comprehensive improvement and other aspects. The improvement was mostly focused on the network layer and above, and the improved plan mostly increases the complexity of the algorithm, this is very adverse to the mobile node energy limited. Main reason for the decline in performance of multi-hop TCP adhoc networks is not the stability of the MAC layer of the exposed terminal problem and binary backoff mechanism induced by TCP, so the AdHoc network MAC layer is improved, the first is not stability for the AdHoc network due to the multi-hop characteristic causes the TCP to put forward their own improvement, and analysis the results of simulation and improvement. Then the improved scheme is put forward on the channel exists in multi-hop adhoc networks to lock the unfairness caused, and simulation analysis proved that the improvement can not only improved AdHoc network has many unfair problems of connection, not stability but also can improve TCP, increase throughput, the two improved are relatively simple, no increase of mobile node energy consumption and network load, mobility is not suitable for adhoc network.
翻译：随着移动通信技术的大规模发展,3G时代的到来,蜂窝网无线定位技术在理论上是越来越成熟,也出现了越来越多的应用研究,蜂窝移动通信系统定位技术不仅提供位置信息服务的用户,紧急援助和货物跟踪功能,在确保国家安全的犯罪也发挥有效的作用.无线蜂窝网络定位系统的基本原理是在蜂窝网络中,根据移动台的位置（特征参数,如到达时间TOA,TDOA的到达时间差的到达,AOA,角）进行了测量和移动台的位置的估计,移动位置.首先,本文介绍了无线定位技术在蜂窝网络中的应用,蜂窝网络系统和各种常见的定位技术进行了讨论.其次,本文介绍了基于的基本原理和在蜂窝网络的TDOA定位算法数学模型的TOA定位算法,对NLOS误差模型和定位系统的影响分析,在传统的定位算法相同的时间（如Chan算法,Fang算法,弗里德兰德和泰勒级数展开法）进行了研究,也对NLOS误差的定位算法分析.最后,本文介绍了基于OFDM信号的定位技术,介绍了采用OFDM信号强度的定位,OFDM信号TOA估计算法和定位算法进行了仿真research.adhoc网络是一种自组织网络,没有通信基础设施的支持,可在一些移动节点之间的通信.AdHoc具有组网灵活等特点,资源的有效利用,将有广阔的应用前景,在军事通信,应急通信,商业应用环境.然而,在同一时间,因为它的误码率高,电池容量有限,容易被监测和其他问题,我们需要不断的改进和完善.Ad Hoc网络是一种新的网络,还存在很多问题,实现,做实践和大量的工作.由于多跳无线AdHoc网络传输和网络拓扑结构的变化,比有线网络的TCP性能恶化.如何解决自组织网络中的TCP应用问题是面临的一个迫切需要解决的问题.目前主要研究方向的TCP改善AdHoc网络的集中在MAC层的性能,提高网络层,传输层机制,并基于原有体系结构改进增加了一层.TCP拥塞控制机制的核心是.当前的TCP版本主要是太浩湖,雷诺,NewReno,SACK和Vegas几种,和一种改进的无线网络方案称为大.tahoetcp的拥塞控制机制分为三个阶段,即,慢启动,拥塞避免,快速重传.TCP是基于tcptahoe,但都进行了改进,使TCP可以更高效地运行或适合特定的网络状态.renotcp是目前在TCP网络版,使用最广泛的.它增加了基于Tahoe快速恢复.newrenotcp是renotcp小改进,解决了renotcp中的多个数据包的快速恢复丢失的问题.选择性确认（SACK）通过接收器的选择性数据验证提高TCP的性能,它可以解决一个窗口的数据包丢失的问题.大的机构,它是专为无线网络提高共享信道的去做.vegastcp具有拥塞控制机制TCP从以前的五完全不同.三种技术的拉斯维加斯主要用于提高吞吐量降低