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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 | 认知无线电网络中压缩协作频谱感知显示文摘低频谱利用率条件下的信道状态向量具有稀疏性,为降低认知无线电网络中各个认知用户的频谱感知冗余,基于压缩感知技术提出了一种低复杂度的协作频谱感知方法.仿真结果表明,通过稀疏观测矩阵提高了单个认知用户感知过程的速度和效率;在融合中心对观测数据进行重构过程中使用因子图迭代算法,大幅降低了计算难度;同时可以根据认知网络中的频率使用情况,自适应调整认知用户的感知点数,确保整个网络的高效感知. | 石磊 周正 唐亮 孙璇 张静 | 2011 | 北京邮电大学学报2011，34，5： | 8 |
| 3 | 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 |
| 4 | Effective capacity region of two-user opportunistic spectrum access显示文摘The effective capacity region of the two-user opportunistic spectrum access (OSA) system in Rayleigh fading environment is derived in this paper.Although OSA is a contemporary research topic,little attention has been given to the capacity analysis under quality-of-service (QoS) constraints.Hence,we use the effective capacity,which is a powerful tool to analyze the QoS requirements in wireless communication systems,to study the sustainable packet arrival rate of the secondary users while meeting statistical QoS constraints.We derive the effective capacity region of the two-user OSA system and propose a method to obtain the capacity region boundary.In addition,by combining the finite state channel model and the activity of the primary user,an extended finite state channel model for the two-user OSA system is also proposed. | XU YuHua WANG JinLong WU QiHui | 2011 | Science China(Information Sciences)2011，54，9： | 2 |
| 5 | 无线电信号协同检测和压缩传感研究显示文摘通过无线电监测发现异常无线电发射是无线电管理中的一项重要工作。提出了适用于区域性无线电监测的多节点协同检测和压缩传感模型,并基于软件无线电平台建立多节点监测系统验证了协同检测方法的有效性。结果表明,基于接收信号本征值构造测量统计量,在合适的判决门限下可以获得较高的检测率;在系统中引入压缩传感极大地减少了从传感节点到汇聚节点的数据传输量。这对发展网格化无线电监测网络,实现无线电频谱的精细化管理具有重要意义。 | 杨晶晶 冯云 陈志钢 唐皓 黄铭 | 2017 | 系统仿真学报2017，29，12： | 1 |
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