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双语推荐：ALOHA

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详细介绍了基本ALOHA算法、时隙ALOHA算法、帧时隙ALOHA算法和动态帧时隙ALOHA算法基本原理和系统效能，分析了上述4种算法各自特点。提出了基于分组的动态帧时隙ALOHA算法，该算法根据标签数量对标签进行分组，并动态匹配最佳帧长。仿真结果表明，改进后算法系统具有吞吐率高、不受标签数量限制、节约帧时隙等优势。
This paper introduces the basic ALOH algorithm, slotted ALOHA algorithm, frame slotted ALOHA algorithm and dynamic frame slotted ALOHA algorithm in details, as well as their basic principle and system effectiveness, and analysis their characteristics. Based on the dynamic frame slotted ALOHA packet algorithm of this paper is presented, labels are grouped according to the number in the algorithm, and dynamic matching optimal frame length, the simulation results show that the improved system has the advantages of high throughput, unrestricted in the number of labels, saving time slots of a frame, and so on.

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文章在研究卫星系统中实现分组通信的短数据包纯ALOHA、扩频ALOHA方式和时隙ALOHA(SALOHA)多址接入方式,以及适合长数据包的预约ALOHA多址接入方式的基础上,介绍了防止S-ALOHA系统饱和与振荡的输入控制(ICP)、重发控制(RCP)和输入重发控制(IRCP)3种动态稳定控制策略。首先,针对3种策略都涉及到的积压终端数估计,文章提出了一种修正算法,并进行了仿真验证。在分组高到达率的情况下,该算法较于传统算法仍然能保证系统的小时延和吞吐率相应增加。其二,就无线信号分组被遮蔽但仍存在捕获效应的移动卫星通信场景,介绍了一种基于S-ALOHA的终端分组发送概率的动态稳定的计算算法,该算法利用捕获效应可以进一步改善陆地移动卫星通信系统性能。
This paper discusses the ALOHA multiple access technique of packet communication in satellite systems. General ALOHA methods are firstly introduced including the pure ALOHA,spread ALOHA and slotted ALOHA ( S-ALO-HA) suitable for short packets, and the reservation ALOHA for long packets. Then three dynamic stability control strate-gies,Input Control Procedure ( ICP) , Retransmission Control Procedure( RCP) and Input Retransmission Control Procedure ( IRCP) , are given to prevent the saturation and oscillation of S-ALOHA systems. In order to implement the above control strategies,the receiving satellite needs to estimate the number of backlogged terminals in the system. A modified estimation algorithm for the number of backlogged terminals is presented and is validated by simulations. In addition,a Terminal-Pack-ets-Transmission-Probability computation algorithm, which is suitable to satellite communication scenarios with dodging effect, is introduced. This channel-sensitive, dynamically

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本文简要介绍了近距离无线通信技术及其发展状况，分析了类ALOHA算法在近距离无线通信技术上的应用，并对它们之间的联系和区别作了介绍，最后着重探讨并分析了动态帧时隙ALOHA算法的效率。
The paper introduces near field communication and its development status. The paper analyzes dif-ferent ALOHA algorithms, compares their difference and affiliation,and mainly discusses the Dynamic Frame Time Slot ALOHA algorithm.

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在RFID系统中，多标签引起的冲突一直是影响系统性能的问题。在分析ALOHA 算法的基础上，提出一种分组动态帧时隙ALOHA算法。根据冲突情况，从数学角度对动态帧时隙ALOHA算法的标签数作出实时估计，动态地改变帧长或对标签进行分组来降低标签发生碰撞的概率，从而提高识别的效率。
In the RFID system,the conflict caused by the multi-label has been affecting system performance .This paper proposed a grouping dynamic framed slotted ALOHA algorithm based on the analysis of ALOHA algorithm . According to the conflict situation , to make real-time estimates the number of tags on the dynamic framed slotted ALOHA algorithm from the mathematical point of view , Dynamically change the frame length or the labels are grouped to reduce the label probability of collisions ,thereby improving the efficiency of the recognition .

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时隙ALOHA使用了各种控制算法以保证系统的稳定性,在应用控制算法前,必须对算法的性能进行前期仿真测试.在比较三种常用网络仿真工具的基础上,分析了MATLAB离散事件仿真原理及基于蒙特卡洛法的随机数生成原理.给出了MATLAB仿真平台下实现时隙ALOHA控制算法的流程图,并依据该流程编写了MATLAB代码对时隙ALOHA的伪贝叶控制算法性能进行测试.仿真结果表示,MATLAB能很好的实现对时隙ALOHA控制算法的仿真.
Slotted-Aloha has to employ varioUs kinds of control algorithm to ensure the system stability. Before an algorithm is applied in practice, a simulation test must he conducted to test its reliability. Based on the comparison of the three commonly used network simulation tools, principles of discrete event MATLAB simulation and the principles of random number generation based on Monte Carlo Method is subjected to analysis. The control algorithm flowchart of slotted ALOHA on MATLAB is presented, on the basis of which MATLAB code is written and then a simulation test is done to the Performance of Pseudo Bayesian control algorithm and the results show that MATLAB can well fulfill the simulation of the slotted ALOHA algorithm.

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在射频识别系统中为使标签能够被实时、高效地识别,提出了一种基于码分多址思想的帧时隙ALOHA防碰撞算法(CD-FSA)。首先分析了算法的设计思路,然后构造了算法的数学模型,推导出了其系统吞吐量的表达式,最后进行了仿真实验和比较分析。结果表明,CD-FSA算法与帧时隙ALOHA算法、动态帧时隙ALOHA算法和二进制树搜索算法相比,系统吞吐量高且识别相同数量的标签所用时隙数少。
In order to make the tags to be read in real-time and efficiently in RFID system,a novel frame slotted ALOHA anti-collision algorithm based on code division multiple access (CD-FSA) is presented. Firstly,the paper analyzes the design ideas of the algorithm,and then,constructs a mathmatical model and deduces the expression of system throughput of the algorithm,makes simulation and comparative analysis finally. The results show that the CD-FSA algorithm has a much more higher system throughput and uses much more fewer time slots for reading the same number of tags compared to the frame slotted ALOHA algorithm,dynamic framed slotted ALOHA algorithm and binary-tree search algorithm.

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射频识别是物联网技术的核心，标签冲突问题是射频识别必须要解决的一个关键问题．针对射频识别系统中的标签冲突问题，分析了Aloha算法及其改进算法．提出了一个基于FibonacciNumber的动态帧时隙Aloha改进算法，并建立了动态调整帧长的策略．仿真结果表明该算法能提高系统的吞吐率和系统负载．
RFID plays the core role in the internet of thing, tag-collision is a key issue and must be addressed for radio frequency identification. Aim at the problem of tag-collision in RFID system, this paper analyzed ALOHA algorithm and it''s enhanced algorithm in detail. An new ALOHA algorithm based on Fibonacci Number was proposed, and the strategy of changing the frame length was established. The simulation indicated that the proposed algorithm can improve the throughput and load of RFID system.

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防碰撞算法是RFID系统中需要解决的关键技术.首先对帧时隙ALOHA防碰撞算法进行了分析,针对帧时隙ALOHA算法的局限性,提出了一种基于分组机制的动态帧时隙算法,并在.NET平台下对原算法和改进算法进行了仿真实验,仿真结果表明,改进后算法可以提高RFID系统吞吐率.
The anti- collision algorithm is the key technology of RFID system. Firstly,this paper studied frame-slotted ALOHA anti-collision algorithm,in order to solve the shortcomings of ALOHA algorithm,an improved anti- collision algorithm is proposed based on grouping mechanism,and it also carried out the simulation experiences using the C# language under the .NET platform. The simulation results indicate that the improved algorithms can increase RFID system throughput.

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为解决射频识别系统中多标签防碰撞问题，在现有ALOHA算法的基础上提出了一种改进的分组动态帧时隙ALOHA算法。当大量标签同时进入阅读器识别范围内时，算法通过设置一个阈值把要响应的标签分成两组，符合条件的一组去响应阅读器，不符合条件的暂时不响应，该算法通过分组限制响应标签数量达到较高的识别效率。仿真结果表明，该算法在标签数大于256甚至更多时识别效率也能维持在相对较高的数值。
In order to solve the problem of collision between multi-tag in RFID (Radio Frequency Identification) system, an improved grouped dynamic frame slotted ALOHA algorithm based on the existing ALOHA algorithm is proposed. When large numbers of tags come to this filed at the same time, the algorithm would divide them into two groups through the prcset threshold. One group that match as the condition would respond to the reader, while the other group not. This algorithm can achieve high discernment efficiency by grouping and restricting the number of responsding tags. Simulation results show that, the identification efficiency is maintained at a relatively high value when the number of tags in the algorithm is greater than 256.

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文章主要对基于DFSA(Dynamic Framed Slotted ALOHA)的EPC Gen2协议进行研究、仿真和改进,通过对Gen2特有的SBS方式进行研究,在分析其优缺点之后提出使用连续时隙调整帧长方法的Q改进算法。通过仿真从理论和仿真结果上论证了改进方法的有效性。
Based on the Dynamic Framed Slotted ALOHA, the paper improves the EPC Gen2 protocol. Through the research of SBS, which is the unique method for the Gen2, the improved Q algorithm is proposed after the analysis of the advantages and disadvantages. Simulation results show that the effectiveness of the improved Q algorithm.

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