TD-LTE系统频谱共享应用的实现方案探讨

频谱共享应用是提高频谱利用率、缓解未来移动通信系统频谱紧张局面的有效手段。本文从工程应用的角度,对TD-LTE系统实现频谱共享的应用方式及若干关键问题进行了研究和探索,研究结果为未来TD-LTE系统的大规模频谱共享应用提供了有益参考。     

个人移动通信频谱需求分析

分析了移动通信市场发展的特点,通过预测远期移动用户及业务状况.使用ITU-RM.1390计算方法估算了移动通信2G、3G混合组网阶段对频谱资源的需求情况,并分析了3G独立组网后频谱资源估算方法.     

广播电视及移动通信对卫星地球站的干扰分析

鉴于卫星地球站设备与广播、电视、移动通信频率相重叠的情况，从广播、电视、天馈线等多角度进行了干扰分析。     

授权的频谱共享技术

随着无线频谱资源需求的不断增加,如何更有效地利用稀缺的频谱资源成为了各国关注的重点问题。授权的频谱共享技术作为一种新兴的频谱资源管理方式,允许获得共享授权的用户在不影响原频谱所有者服务的情况下共享使用该频段。目前,美国和欧洲正在大力推动授权的频谱共享技术的应用,这种方式可以为我国频谱管理工作带来新的启发。     

频谱共享应用中的动态频率规划方案探讨

适应频谱动态变化的频率规划方法是蜂窝移动通信系统实现频谱共享应用的核心问题之一.本文在充分考虑频谱资源时变特性和蜂窝移动通信系统频率复用技术特点的基础上,提出了一种适应频谱动态变化的动态频率规划技术,为未来频谱共享蜂窝无线通信系统的实际大规模网络应用奠定了基础.     

广播电视频谱使用现状与发展趋势探索

本文介绍了全球广播电视频谱的应用现状和发展趋势,并对模数转换后原有广播电视频谱的使用状况进行了分析对于我国广播电视的未来频谱规划和管理具有较高的参考价值.此外,还讨论了美国广播电视“空闲频谱”的相关规范及发展应用情况,并对其频谱探测的核心技术——认知无线电进行了介绍和分析.     

未来移动通信系统频谱共享共存智能管控体系架构探讨

未来移动通信系统对传输速率的要求将是现在的100倍,这意味大量额外的频谱资源需求.本文提出跨地域、跨频段、跨业务的未来移动通信系统频谱共享共存智能管控体系架构,以实现多维度频谱资源智能分配和高效使用,减少违规用频和非法干扰的产生;提出频谱高效使用新范式,满足我国面向多产业的广覆盖、跨多频的未来移动通信系统应用需求,为未...     

动态频谱共享简述

无线电频谱是新一代信息技术的重要载体,频谱共享是解决传统使用方式带来的资源供需矛盾和资源利用率低等重要问题的有效手段,为了对动态频谱共享进行介绍,首先通过解析频谱共享概念,分类阐述频谱共享方式,加深了对频谱共享内涵的理解,之后具体介绍了动态频谱共享技术的发展和两种主流实现技术,最后讨论了推行频谱共享的必要性。     

卫星通信与测量系统频谱共享信号设计

信号共存是一种解决频谱资源紧张的有效方式.基于CDMA和FDMA两种典型信号对卫星通信与测量系统中信号频谱重叠共用条件进行了研究.采用系统间干扰分析法及伪码测量噪声分析法从理论上推导了2种信号间的影响,通过设计调整CDMA用户信号和FDMA用户信号的可变参数,给出了对双方通信性能及对CDMA用户测量性能的影响分析方法,...     

广播电视“白频谱”跟踪研究与探索

本文介绍目前广播电视"空闲频谱/频道"(又称"白频谱")研究的发展应用情况,详细解读了美国频谱管理机构所制定相应规范。同时对"白频谱"探测的核心技术——认知无线电的发展应用进行了讨论和分析。广播电视"白频谱"既是挑战也机遇,广播电视行业应积极探索低功率发射设备业务应用新模式,从而提高行业核心竞争力。     

异构网络频谱共享在低频段重耕中的应用研究

LTE下载速率对大带宽的迫切需求、GSM网络退网的长尾效应以及传统的频谱静态分配方式,导致了900 MHz频谱资源的供需矛盾。本文研究了基于异构网络动态频谱共享的方案及在低频段重耕的应用及效果,实践表明方案在保证FDD LTE与GSM网络质量的情况下,利用频谱共享带来的错峰增益,提高了频谱利用率,并具备一定的可实施性。     

Joint power control and spectrum sensing for capacity maximisation in spectrum sharing systems

We study the problem of joint power control and spectrum sensing for maximising the capacity at the secondary user while protecting the primary user's transmissions in spectrum sharing cognitive radio systems. Power control regulates the transmission power of the secondary user and spectrum sensing regulates the sensing time and the sensing threshold that care for the primary user's protection. This problem is a capacity maximisation problem that we formulate and solve using an iterative greedy algorithm due to its complex form. The solution of the proposed algorithm leads to the global optimal solution that represents the optimal triplet values of transmission power, sensing time and threshold. The obtained results show the potential capacity maximisation that is achieved by the proposed joint design as long as the primary user's protection is provided. Finally the convergence behaviour of the proposed algorithm is assessed in terms of the needed iterations for enhancing the capacity of spectrum sharing systems.     

Spectrum sharing considerations for the proposed ESA ‘archimedes’ satellite DAB service

At the 1992 World Administrative Radio Conference (WARC), spectrum was allocated, on a primary basis, to the broadcast satellite service (sound). The allocations were not, however, uniform worldwide, nor will the BSS(S) have sole use of these allocations. In addition, many countries have reserved primary use of the spectrum for existing services until 2007, with the BSS(S) permitted only on a noninterference basis. This situation will impose serious constraints on the proposed ESA S-DAB service, to be radiated from the ‘Archimedes’ constellation of satellites. The launch date for this service may be before the end of the century, and sharing with other spectrum users will therefore be necessary. Such users include fixed telephony links, broadcast links and mobile aeronautical telemetry. This paper reviews current spectrum usage in Europe and elsewhere, and investigates the restrictions thus imposed on the ESA S-DAB service. Numerical examples based on real-world systems are given, and demonstrate the feasibility, in many cases, of spectrum sharing.     

我国频谱共享的可行性研究与推进建议

目前,我国工业和信息化领域一系列战略稳步推进,5G、移动互联网等信息技术快速发展,无线电频谱资源的稀缺性再次凸显。频谱共享为解决频谱资源的稀缺问题提供了解决方案,并被国际主流国家积极推行。在分析国内外频谱共享研究与应用现状的基础之上,进一步讨论了我国推行频谱共享的意义和挑战,给出了频谱共享可行性评估和分析框架,并提出了频谱共享的推进建议。     

Performance analysis of multiuser selection diversity in SIMO spectrum sharing systems

In this paper, a performance analysis is presented for user selection schemes in a single‐input multiple‐output spectrum sharing system. In the considered system, multiple secondary users try to use the licensed spectrum of a primary user in an opportunistic manner, in which an interference constraint for the primary user is satisfied. In this paper, we first use 2 conventional user selection schemes for single‐input multiple‐output spectrum sharing system and analyze the system performance for each scheme. We then propose a new user selection scheme that can overcome the limitations of those 2 conventional user selection schemes. As for the performance analysis, the average channel capacity, the outage probability, and the bit error rate performances of the system using the presented user selection schemes are analyzed and mathematical closed‐form expressions for the outage probability are derived. The performances of the system are evaluated using the derived mathematical formulas in different cases. In addition, Monte Carlo simulation results are also provided to show the accuracy and correctness of the performed analysis.     

数字音频广播设台对民航业务的干扰分析

随着数字技术的发展,数字化已经成为世界广播电视发展的必然趋势.基于ITU-R SM.1009-1建议书及国家标准G/B 6364-2013《航空无线电导航台(站)电磁环境要求》所给出的保护场强,并参考中国现行的数字音频广播台的典型参数,分析了数字音频广播设台对邻频民航地空通信的互调干扰,给出了干扰缓解建议.     

Modeling and performance analysis of dynamic spectrum sharing between DSRC and Wi‐Fi systems

The Notice of Proposed Rulemaking 13‐22 released by Federal Communications Commission unlocks the Dedicated Short Range Communication (DSRC) spectrum for Wi‐Fi availability, which undoubtedly brings unpredictable effects to the new‐emerging vehicular applications and services. To efficiently harmonize the spectrum operation between DSRC and Wi‐Fi networks, several dynamic spectrum‐sharing schemes are already proposed to improve the spectral efficiency over a limited bandwidth situation and as well to satisfy the ever‐increasing demand for bandwidth resource. Different from most previous literature that mainly focused on the performance analysis of cellular‐network‐centric spectrum sharing, we aim to analyze the performance of the mainstream dynamic spectrum‐sharing schemes specially designed for the coexistence of DSRC and Wi‐Fi networks against various combinations of network parameters through a hybrid network model and performance indicators. We employ the Poisson point process to model a hybrid network where DSRC vehicles and Wi‐Fi devices coexist, and introduce the performance indicators of spectrum efficiency and data rate to assess the utility of different spectrum sharing candidates. Through the presented hybrid model and performance indicators, we collect extensive numerical and simulation results to investigate four typical spectrum allocation schemes for DSRC and Wi‐Fi coexistence, that is non‐sharing scheme, original sharing scheme, and Qualcomm's and Cisco's proposals, respectively. The results show that the dynamic spectrum sharing in the 5.9‐GHz band can significantly raise the performance of Wi‐Fi network without excessively degrading the DSRC system, and especially the Cisco's proposal prefers to protect the DSRC profit while the Qualcomm's draft favors Wi‐Fi exclusively. Copyright © 2016 John Wiley & Sons, Ltd.     

动态频谱共享研究现状及展望

动态频谱共享作为解决频谱供需矛盾的有效方式之一,在国际上受到了广泛关注.首先,对动态频谱共享的发展情况进行了概述.然后,对国际上动态频谱共享的政策制定、标准化及应用情况等进行了梳理.最后,结合无线电管理现状,分析了实施动态频谱共享在频率管理、台站管理及无线电监测等方面的影响及挑战.     

基于空间位置的混合频谱共享系统功率分配研究简

针对次用户空间位置分布的随机性,提出空域混合Overlay/Underlay频谱共享模型以提高无线频谱利用率。根据次用户在不同空间位置对主用户的干扰,在主用户干扰容限约束下推导出次用户工作于Overlay状态和Underlay状态的空间区域;以最大化系统容量为准则建立认知系统功率优化分配模型,推导出次用户的最优功率分配方案,进而得到认知系统可获得的最大容量;理论和仿真结果表明,基于空间位置的混合频谱共享系统可以获得比Overlay系统更高的容量。