第 37 卷第 10 期 电 子 与 信 息 学 报 Vol.37 No.10
2015
年
10
月
Journal of Electronics & Information Technology Oct. 2015
多媒体多播组播单频网中免干扰动态信道分配
张海波
*①②
刘盈娜
①
李方伟
①
刘开健
①
①
(重庆邮电大学重庆市移动通信重点实验室 重庆 400065)
②
(北卡罗来纳州立大学电子与计算机工程系 美国北卡罗来纳州 27695)
摘 要:为了避免多媒体多播组播单频网(MBSFN)区域内部和区域之间的干扰,进一步提高频谱效率,该文提出
一种改进的基于噪声调节时滞噪声混沌神经网络(NHNCNN)的动态信道分配方法。首先,根据 MBSFN 区域的特
殊拓扑结构,重新定义了 4 种电磁兼容限制函数,在此基础上精心构建了免干扰的 NHNCNN 能量函数。其次对
NHNCNN 的稳态判定进程加以改进以提高系统的收敛速度。特别地,采用类二分法联合 NHNCNN 去搜索最小信
道分配总数。仿真结果表明,利用富足的 NHNCNN 时滞、噪声和混沌神经动力,所提算法能有效地搜索到合理解,
并最终找到全局最优解,提高了频谱效率。与现有方法相比,所提算法能够实现更好的收敛速度和合理解率。
关键词:抗干扰;动态信道分配;多媒体多播组播单频网;噪声调节时滞噪声混沌神经网络;类二分法
中图分类号: TN929.5 文献标识码: A 文章编号:1009-5896(2015)10-2438-08
DOI: 10.11999/JEIT150044
Interference-avoidance Dynamic Channel Allocation for Multimedia
Broadcast Multicast Service Single Frequency Networks
Zhang Hai-bo
①②
Liu Ying-na
①
Li Fang-wei
①
Liu Kai-jian
①
①
(Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and
Telecommunications, Chongqing 400065, China)
②
(Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC USA, 27695)
Abstract: A dynamic channel allocation algorithm is proposed to avoid all interference and improve spectrum
efficiency in Multimedia Broadcast multicast service Single Frequency Networks (MBSFN). Four electromagnetic
compatibility constraint functions are redefined according to the topology information of MBSFN. In order to
avoid all intra-area and inter-area interference of MBSFN, a novel energy function of Noise-tuning-based Hysteretic
Noisy Chaotic Neural Network (NHNCNN) is constructed elaborately based on renewed constraint functions. Also,
the judgment process of the stable state of NHNCNN is developed to accelerate system convergence. Specifically,
the dichotomy method is adopted jointly to minimize the total number of allocated channels so as to further
improve spectrum efficiency. Simulation results show that a feasible solution without any interference can be
effectively searched by the improved NHNCNN. Finally, the optimal solution with minimum total channel number
is found. Compared with existing algorithms, the proposed algorithm achieves better convergence speed and
quality of solution.
Key words: Interference-avoidance; Dynamic channel allocation; Multimedia Broadcast multicast service Single
Frequency Networks (MBSFN); Noise-tuning-based Hysteretic Noisy Chaotic Neural Network (NHNCNN);
Dichotomy method
1 引言
在移动互联网快速发展的推动下,越来越多的
移动宽带多媒体业务应运而生。人们对多媒体多播
收稿日期:2015-01-08;改回日期:2015-06-05;网络出版:2015-07-17
*通信作者:张海波 wdkyzl@gmail.com
基金项目:国家青年自然科学基金(61301122),重庆市科委项目
(cstc2014jcyjA 40052)和重庆市教委项目(KJ1400405)
Foundation Items: The National Natural Science Foundation of China
(61301122); The General Project on Foundation and Cutting-edge
Research Plan of Chongqing (cstc2014jcyjA40052); The Research
Program of Chongqing Education Commission (KJ1400405)
组播技术(Multimedia Broadcast/Multicast Service,
MBMS)也展开了广泛和深入的研究
[1 5]−
。为了进一
步提高无线资源利用率,优化空中接口性能,无线
多媒体多播组播单频网技术(MBMS over a Single
Frequency Network, MBSFN)更加备受业界关
注
[3 5]−
。然而,由于 MBSFN 中各基站采用同时同
频发送相同的信号,导致 MBSFN 区域内和区域间
很容易产生大量干扰,使其性能急剧下降。而动态
信道分配(Dynamic Channel Allocation, DCA)技术
是避免其各种干扰的有效措施之一。