一种基于非线性长度的多约束路由算法*

满足多个约束的QoS路由问题已经被证明是NP完全问题。在分析了多种路由算法的基础上,设计了一种高效的多约束路由算法。该算法采用非线性路径长度计算方法。为提高算法的成功率,在节点的松弛过程中设计了节点动态路径长度计算,允许节点作多次松弛。为提高算法的执行效率,在节点正向松弛和反向估计过程中引入了受控路径的思想,使算法得到了优化。大量仿真表明,该算法在最短路径获取和路由发现成功率方面都有高效的表现。     

对含脉冲噪声的图像去噪算法的研究

在传统均值滤波和中值滤波的基础上,结合聚类算法理论,采用硬聚类算法和模糊模型两种算法消除图像中的脉冲噪声。与传统的滤波算法和硬聚类模型去噪算法相比,基于模糊模型的去噪算法更好地提高了图像的清晰度和信噪比。     

Femtocell网络中博弈式频率复用算法

提出了一种适用于Femtocell网络的博弈式频率复用算法。在Femtocell网络中,首先Femtocell基站通过感知其无线环境选择临时子频带,然后通过对分簇后的Femtocell网络执行簇内协调和簇间博弈两步算法,消除相邻Femtocell之间的频谱冲突,使Femtocell网络合理地复用频谱资源。在Femtocell随机部署的网络中,该方法解决了Femtocell网络中的频谱冲突问题。仿真表明,采用该算法后,Femtocell网络的频谱冲突得到有效改善,Femtocell系统平均信道容量明显提高。     

多小区的分布式天线系统中天线选择与鲁班性波束形的联合优化（英文）

Most of studies on Distributed Antenna System(DAS) focus on maximizing the sum capacity and perfect channel state information at transmitter(CSIT).However,CSI is inevitable imperfect in practical wireless networks.Based on the sources of error,there are two models.One assumes error lies in a bounded region,the other assumes random error.Accordingly,we propose two joint antenna selection(AS) and robustbeamforming schemes aiming to minimize the total transmit power at antenna nodes subject to quality of service(QoS) guarantee for all the mobile users(MUs) in multicell DAS.This problem is mathematically intractable.For the bounded error model,we cast it into a semidefinite program(SDP) using semidefinite relaxation(SDR) and S-procedure.For the second,we first design outage constrained robust beamforming and then formulate it as an SDP based on the Bernstein-type inequality,which we generalize it to the multi-cell DAS.Simulation results verify the effectiveness of the proposed methods.