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| 1 | 中国下一代移动通信研究显示文摘随着无线通信网络的迅速发展,第四代移动通信(4G)正逐渐成为通信系统的主流技术.4G通信系统力图克服第三代移动通信(3G)的局限性,为用户提供更高的带宽、更好的服务质量以及更低的资费.本文讨论了4G网络中的关键技术,并且着重调研了国内学者所开展的4G技术研究.所调研的4G技术涉及多载波传输技术、多天线技术、载波聚合技术、中继技术、认知无线电技术、分布式天线系统、网络融合技术以及网络自优化技术.上述4G关键技术为满足国际电信联盟(ITU)提出的高级全球移动通信标准(IMT-Advanced)提供了重要的技术支撑.本文将详细介绍每一种技术的作用、研究内容和现有解决方案.最后,探讨了4G系统面临的挑战以及未来研究方向. | 田金凤 郑小盈 胡宏林 尤肖虎 | 2012 | 科学通报2012，57，5： | 17 |
| 2 | A survey of next generation mobile communications researchin China显示文摘With the rapid development of wireless communication networks, the fourth generation (4G) has emerged to move beyond the limitations of the third generation (3G), with increased bandwidth, enhanced quality of services, and reduced costs of resources. In this paper, we discuss the key technologies of 4G and focus on surveying the ongoing research in 4G communications in China. The 4G technologies under investigation include multicarrier transmission, multiple antenna techniques, carrier aggregation, relays, cognitive radio, distributed antenna systems, network convergence, and network self-optimization. These technologies are the building blocks of 4G and contribute largely to the requirements of International Mobile Telecommunications Advanced (IMT-Advanced). For each technology, its benefits, research topics, and some existing approaches are examined. Finally, we briefly discuss the challenges and future research issues in 4G systems. | TIAN JinFeng 1,2 , ZHENG XiaoYing 2,3 , HU HongLin 1,2 YOU XiaoHu 1,3 1 Shanghai Research Center for Wireless Communications (WiCO), Shanghai 200335, China 2 Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences (CAS), Shanghai 200050, China 3 National Mobile Communications Research Laboratory, Southeast University (SEU), Nanjing 210096, China | 2011 | Chinese Science Bulletin2011，56，27： | 6 |
| 3 | Approximating maximum likelihood performance reduced dimension VBLAST detection algorithm显示文摘SM (spatial multiplexing) can effectively increase the information rate in multiple input multiple output system. BLAST is the typical representation of SM, especially VBLAST, which has some simple de- tection algorithms such as ML, ZF-DFE and ML-DFE, etc. However, the existing algorithms cannot approach ML performance. This paper discusses the effect for detection performance by the correlation of channel ma- trix, proposes a new algorithm-HPML detection algorithm, which can approach ML performance with low complexity. In the new algorithm, we travel the first d layers, and use the DFE procedure for the remaining layers, then perform ML detection for all obtained signals. Simulation results show that HPML can approach ML performance when the traveling numbers are not less than half of the number of transmitting antennas, and the algorithm complexity is smaller than ML. | CHENG WenChi & ZHANG HaiLin State Key Lab of ISN, Xidian University, Xi’an 710071, China | 2010 | Science China(Information Sciences)2010，53，7： | 2 |
| 4 | 4×4 V-BLAST系统分组最大似然检测算法显示文摘对于V-BLAST系统的检测,最大似然(ML)算法有着最优的性能却也有最大的计算复杂度;经典的排序连续干扰抵消(OSIC)算法复杂度较低,但数值稳定性差,且性能与ML差距较大。因此,本文基于检测性能和计算复杂度折中的思想,针对4×4 V-BLAST系统提出了一种分组最大似然(Group ML,GML)检测算法,在保证较好检测性能的基础上,通过将四维ML检测器分成两组二维ML检测器来降低计算复杂度。此外,本文还提出了一种简化的最大似然(Simpli-fied ML,SML)检测算法,通过将每组中的二维ML检测器的搜索空间从二维降至一维,进一步降低了计算复杂度,并证明其与ML算法具有一致的性能。仿真表明,在误符号率为10-3时GML算法相比OSIC算法有约7dB的性能提升。经分析知,GML算法复杂度与ML-OSIC算法相比在高阶调制方式下有着显著的降低,易于硬件实现。 | 王海红 王欣 魏急波 | 2010 | 信号处理2010，26，3： | 1 |
| 5 | 一种针对C程序缓冲区溢出的检测方法显示文摘为了增强对程序缓冲区溢出漏洞的检测,提出一种利用CCured和BLAST对C程序进行分析的检测方法。首先利用CCured对C语言源程序进行运行时检测的代码插桩;然后用BLAST提供的自定义安全属性语言对这些插桩代码进行相关约束描述;最后让BLAST根据约束描述文件对代码插桩后的程序进行模型检测,就可以尽可能地找出C语言程序中潜在的缓冲区溢出漏洞。 | 徐超 何炎祥 胡明昊 吴伟 陈勇 刘健博 | 2012 | 计算机应用研究2012，29，2： | 0 |
| 6 | 基于量子Grover算法的VBLAST系统信号检测显示文摘VBLAST系统中最大似然检测具有最优的检测性能,但是计算复杂度是一个NP难题.将量子Grover算法及Grover-Long算法用于VBLAST系统最大似然检测中,对算法的复杂度和性能进行了仿真分析,仿真结果表明Grover检测算法不仅能够对计算复杂度起到平方加速的效果,而且算法的检测性能逼近最大似然检测性能. | 汪敏 贾徽徽 江钟 张焕国 王潮 | 2013 | 中国科学:信息科学2013，43，2： | 0 |
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