Cognitive Radio Engine Design Based on Ant Colony Optimization

In this letter, a mutated ant colony optimization (MACO) cognitive radio engine is proposed, and it is the first time to apply ACO algorithm to this problem. The cognitive radio is a promising technology nowadays to alleviate the apparent scarcity of available radio spectrum, and the cognitive radio engine determines the optimal radio transmission parameters for the system. The cognitive engine problem is usually solved by genetic algorithm (GA), however, the GA converges slowly and its performance can still be improved. Hence, MACO algorithm with excellent performance is applied to the cognitive engine in this letter. Simulation results show that the fitness scores obtained by the MACO engine are much better than the ACO and GA engines in different scenarios.     

基于遗传蚁群优化算法的认知无线电频谱分配

针对认知无线电中的频谱分配问题,提出一种融合了遗传算法和蚁群算法优点的频谱分配方法。该方法利用遗传算法快速随机的群体性全局搜索能力生成初始解,然后利用衔接策略将遗传算法初始解转化为蚁群算法所需的信息素初始分布,最后利用蚁群算法正反馈、收敛高效的特点求取最优解。通过仿真比较了该方法与颜色敏感图着色算法的性能。结果表明动态融合了遗传算法和蚁群算法的优化算法性能明显优于颜色敏感图着色算法,它能更好地实现网络效益最大化。     

认知无线网络中一种基于蚁群优化的频谱分配算法

针对认知无线电中的频谱分配问题,该文提出一种基于蚁群优化的频谱分配方法。该方法在授权用户和认知用户共存的认知网络模型中,通过蚁群访问各个认知节点,并释放信息素,从而实现概率型的全局搜索的并行频谱分配算法。与传统的频谱分配方式比较,该算法能够进行增强型学习积累,快速收敛到最优路径,从而获得了最优的平均信道效益。文中对该算法进行了分析和说明,并通过仿真证明了算法的有效性和稳定性。     

云环境下基于改进蚁群算法的网络路由优化

针对云计算多元化复杂的网络结构环境,提出一种旨在改善网络路由的蚁群优化算法.新算法在原有蚁群算法智能寻优的基础上,加入网络节点在网审查机制,实时判断网络节点是否在网,选择最优解路径.仿真实验表明,改进算法能有效的改善因为网络节点在网情况的多变性而造成的部分路径失效的情况,进而缓解网络拥塞.     

Routing Technology in Wireless Sensor Network Based on Ant Colony Optimization Algorithm

With rapid development of wireless communication, sensor, micro power system and electronic technology, the research on wireless sensor network has attracted more and more attention. The work proposed routing algorithm in wireless sensor network based on ant colony optimization by analyzing routing protocol and utilizing advanced idea. Ant colony optimization algorithm has advantages in implementing local work, supporting multiple paths and integrating link quality into pheromone formation. In routing selection, the work calculated probability that node is selected as the next hop according to pheromone concentration on the path. With characteristics including self-organization, dynamic and multipath, ant colony optimization algorithm is suitable for routing in wireless sensor network. With low routing cost, good adaptability and multipath, the algorithm balanced energy consumption to prolong network lifetime. In terms of simulation and experiments, ant colony algorithm was proved to be suitable for finding optimal routing in wireless sensor network, thus achieving design goal of routing algorithm.     

认知网络中基于蚁群算法的网络流量预测模型

认知网络能够感知外部环境,并能根据周围环境的变化智能、自主、自适应的动态变化,这种特性更适合为用户提供QoS(Quality of Service)保障.设计高精度的流量预测模型,可以提高认知网络的认知特性.本文针对原有预测模型预测精度低、对训练数据依赖程度高以及不能很好的刻画网络流量特征的不足,提出了一个混合的流量预测模型.它使用蚁群算法训练BP网络的权值,避免了梯度下降法收敛速度慢、容易陷入局部最优的问题.并且在预测之前,首先使用BP(Back Propagation)网络剔除原始数据中的异常数据信号,再对其进行小波分解,最后使用混合模型预测网络流量,实现了认知网络中高精度的流量预测.     

Meta-heuristic Ant Colony Optimization Based Unequal Clustering for Wireless Sensor Network

Wireless Personal Communications - Sensor nodes are randomly deployed to perform specific area monitoring in geographical region and temporal space. The network connectivity maintenance is a major...     

基于优化成熟度的自适应蚁群优化算法

分析了蚁群算法局部信息素更新系数与全局信息素更新系数对算法寻优能力与收敛速度的关系,定义平均路径相似度(ATS)来表征寻优过程的成熟程度,并据此自适应调整信息素更新系数,提高算法收敛速度并避免陷入局部最优.经过与典型蚁群算法在多个旅行商问题测试用例上进行收敛速度与全局寻优能力的全面比较,证明了新的算法具有较好的效果.     

基于协同合作的蚁群优化算法

蚁群优化是一种模拟蚂蚁觅食的群集智能搜索算法,基本蚁群算法收敛性较差,易陷入局部最优解。本文在基本蚁群算法的基础上,提出一种新的蚁群优化算法,通过在信息素局部更新中引入信息素扩散模型,在信息素全局更新中引入随机扰动机制,发挥蚂蚁之间的协同合作能力,提高了算法的收敛速度。以TSP为例的仿真实验表明,该算法具有较强的寻优能力、较好的鲁棒性和有效性。     

基于蚁群优化算法的路由协议的研究

生物仿真学群集算法在路由中有广泛的的应用,为了充分利用网络资源,降低拥塞程度,提出了一种基于蚁群优化算法的Ad Hoc网络负载均衡路由算法Pro-antnet,通过对蚂蚁收集到的网络信息所对应的参数赋予不同加权值的方法对路由表进行控制,有效地缓解了网络的拥塞问题。该算法具有良好的分布式特性,能为网络提供多条备用路径,增强网络的抗毁性。     

Cognitive Radio Engine Design for IoT Using Real-Coded Biogeography-Based Optimization and Fuzzy Decision Making

The Internet of Things (IoT) paradigm expands the current Internet and enables communication through machine to machine, while posing new challenges. Cognitive radio (CR) Systems have received much attention over the last decade, because of their ability to flexibly adapt their transmission parameters to their changing environment. Current technology trends are shifting to the adaptability of cognitive radio networks into IoT. The determination of the appropriate transmission parameters for a given wireless channel environment is the main feature of a cognitive radio engine. For wireless multicarrier transceivers, the problem becomes high dimensional due to the large number of decision variables required. Evolutionary algorithms are suitable techniques to solve the above-mentioned problem. In this paper, we design a CR engine for wireless multicarrier transceivers using real-coded biogeography-based optimization (RCBBO). The CR engine also uses a fuzzy decision maker for obtaining the best compromised solution. RCBBO uses a mutation operator in order to improve the diversity of the population and enhance the exploration ability of the original BBO algorithm. The simulation results show that the RCBBO driven CR engine can obtain better results than the original BBO and outperform results from the literature. Moreover, RCBBO is more efficient when applied to high-dimensional problems in cases of multicarrier system.     

认知无线网络中拓扑重构的研究

随着异构网络融合和网络自适应化逐渐成为必然的发展趋势,认知无线网络随之出现,并提供了一种实现全局端到端目标优化的方法。认知无线网络由能自适应改变自身配置的网络设备组合而成,为设计灵活高效的拓扑策略提供了可能性和保障。提出了一种拓扑重构的控制策略,能够规划数据传输路由,在高效利用空闲频谱资源的同时,提升了传输的效率和性能。     

基于混沌蚁群算法的BP神经网络训练研究

针对BP学习算法依赖于初始权值的选择和只能处理具有求导或者梯度特性目标函数,导致函数逼近误差较大的缺点,基于适值理论,建立了混沌蚁群算法模型.采用实值编码,把BP神经网络的权值和偏值作为混沌蚁群算法搜索的蚂蚁空间位置;设置合适的适值函数,对BP神经网络权值进行训练,并将其应用于曲线拟和.分别用混沌蚁群算法对不包含噪声的BP神经网络和包含噪声的BP神经网络进行了训练仿真,对仿真结果进行分析,取得了很好的效果.     

基于能量均衡的认知无线电双向中继网络能耗优化研究

针对使用电池的认知无线电（CR）节点能量消耗不均衡导致系统节点生存时间短,能量利用率低的问题,提出了一种基于双向中继（TWR）的无线通信能耗均衡通信系统.该系统由源节点、目的节点、双向中继及其接收节点组成,每个节点分配初始能量,节点间通过合理的方法设置发射功率来实现功率归一化处理,从而平衡节点间的能量,防止网络中部分节点由于能量耗尽过早消亡,实现无线通信网络中节点能量的均衡和网络生存寿命的最大化.仿真结果表明,本文提出的基于能量归一化均衡算法可最大化能效,并能提高能量利用率的同时延长系统生存时间.     

基于蚁群算法的分布式卫星光网络波长路由分配技术研究

为了解决分布式卫星光网络波长路由分配复杂的问题,论文提出基于小窗口策略的蚁群优化算法。采用链路可持续时间和波长空闲率作为启发函数,在实现负载均衡的同时,降低网络的拥塞率;引入小窗口策略引导蚂蚁在最小路由请求区域内进行选路,提高了算法的收敛速度;通过计算相邻链路空闲波长的交集,实现了由单只蚂蚁同时完成路由选择和波长分配。对单主星和双主星两种场景下的算法性能进行了仿真分析,结果表明：与经典的Dijkstra+FF算法相比较,单主星和双主星时的网络拥塞率最高分别降低了0.5和0.7,网络资源利用率改善最高可达到0.45和0.50。     

基于遗传算法的改进智能优化蚁群算法

针对蚁群算法加速收敛和早熟停滞现象的矛盾,根据遗传算法的交叉算子、变异算子和粒子群算法的粒子极值,采用一种优化蚁群算法,以在加速收敛和防止早熟停滞现象之间取得更好的平衡.在利用该算法解决TSP问题中,当前解与个体极值和全局极值分别进行交叉操作,产生的解为新的位置信息.通过对50个城市问题进行实验,结果表明,该方法比一般蚁群算法具有更好的收敛速度和稳定性,适合于求解大规模的问题.     

基于蚁群算法的面向服务软件的部署优化方法

面向服务软件的部署优化问题是典型的NP难题.本文构建了基于性能改善的软件部署优化模型,设计了一种蚁群优化算法ACO-DO进行近似最优解的快速求解.该算法通过设计基于部署优化问题的启发式、改进部署方案的构建顺序、增加局部搜索过程实现蚁群算法求解效率的提升.通过不同规模的实例实验,验证了ACO-DO算法能够取得比现有的混合整数线性规划算法、蚁群算法和遗传算法更好的性能.     

Heuristic Task Scheduling Algorithm Based on Rational Ant Colony Optimization

Distributed data stream processing system is NP-complete problem to assign tasks to any number of nodes handling the task scheduling. Even for substan- tially reducing scheduling scale, the problem still cannot be avoided. This paper takes advantage of the classical al- gorithm （ant colony optimization） of heuristic methods to simulate the global task sclmduling problem of distributed system. Rational improvement on ant colony optimization path-finding for the memory and CPU usage of each node achieves load balancing in a short time. It gives the sub- optimal solution of the global task scheduling. The exper- iments show that the data stream processing system we proposed has good real-time characteristics and stability.     

无线局域网（WLAN）安全策略研究

随着无线局域网技术的不断发展,安全问题日益突出,阻碍了无线技术的普及应用。本文着重就无线局域网的安全技术和策略进行了介绍。     

用于求解函数优化的一个蚁群处算法设计

文章通过对标准蚁群算法的认识，引进遗传算法的编码方式和选择操作，并对蚁群算法的信息素分配进行改进用于一般函数优化，通过几个函数求解，证明其是有效的。