Please wait a minute...
浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (5): 860-866    DOI: 10.3785/j.issn.1008-973X.2013.05.018
电气工程、电信技术     
Overlapped OFDMA—新颖的多载波频谱共享传输机制
宫本康, 张朝阳, 叶露
浙江大学 信息与电子工程学系,浙江 杭州310027
Overlapped OFDMA:a novel spectrum sharing scheme
GONG Ben-kang, ZHANG Zhao-yang, YE Lu
Department of Information Science and Electronic Engineering, Zhejiang University,Hangzhou 310027, China
 全文: PDF  HTML
摘要：

针对现有非连续正交频分复用（DOFDM）等系统通常只允许认知用户利用授权用户未使用的频带进行共享传输的问题，提出一种新颖的频谱共享传输机制，即混叠正交频分复用多址接入（Overlapped OFDMA），能够在一定条件下实现认知用户与授权用户的混叠频谱共享.通过对一般OFDM系统的信号结构进行研究发现，当认知用户的子载波带宽采用授权用户子载波带宽的一半进行传输、其频谱和授权用户频谱存在一定混叠时，只要认知用户保持和授权用户时域信号准同步且其子载波分配方案满足一定的限制条件，授权用户将不受干扰.由于各载波上的干扰都包含有其它载波的信息，因此认知用户可以通过适当的恢复算法将信息完整地恢复.仿真和分析结果表明，尽管Overlapped OFDMA会带来一定的复杂度，但授权用户的性能和DOFDM系统相比几乎相同，而认知用户却获得了更加优异的吞吐量性能.该机制为频谱共享传输体制的设计提供了新的可能性.
Abstract:

In order to further improve the spectrum efficiency in cognitive radio systems such as discontiguous orthogonal frequency division multiplexing (DOFDM) where the secondary user can only utilize the subcarriers unused by the primary user, a novel spectrum sharing transmission scheme, namely Overlapped OFDMA, was proposed in this paper. By investigating the conventional OFDM signal architecture, it was found that, the secondary user and the primary user will not interfere with each other even if their subcarriers are partly overlapped, as long as the secondary user adopts a subcarrier space half of that of the primary user and their subcarriers are properly allocated and quasi-synchronized. The information carried by different subcarriers can be jointly recovered due to that its interference in fact contains information from the other subcarriers. Both the analysis and simulation results show that, the proposed Overlapped OFDMA scheme can achieve similar performance as DOFDM for the primary user, and much better throughput for the secondary user, at a price of increased system complexity. It thus provides a new choice for the design of future spectrum sharing communication systems.
出版日期: 2013-05-01
:  TN 92  
基金资助:

国家重大科技专项资助项目(2009ZX03003-004-03，2010ZX03003-003-01)；国家“973”重点基础研究发展计划资助项目(2009CB320405)；国家自然科学基金资助项目(60972057，61001098).
通讯作者: 张朝阳，男，教授，博导.     E-mail: ning_ming@zju.edu.cn
作者简介: 宫本康（1987-），男，硕士生，从事认知无线电、OFDMA系统的研究. E-mail: darcy.gbk@gmail.com
服务　　
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章　　

引用本文:

宫本康, 张朝阳, 叶露. Overlapped OFDMA—新颖的多载波频谱共享传输机制[J]. J4, 2013, 47(5): 860-866.

GONG Ben-kang, ZHANG Zhao-yang, YE Lu. Overlapped OFDMA:a novel spectrum sharing scheme. J4, 2013, 47(5): 860-866.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2013.05.018    或    http://www.zjujournals.com/eng/CN/Y2013/V47/I5/860

［1］ MITOLA J III, MAGIURE G Q. Cognitive radio: making software radios more personal ［J］. IEEE Personal Communications, 1999, 6(4): 13-18．
［2］ YIN Hu-jun, ALAMOUTI S. OFDMA: a broadband wireless access technology ［C］∥Sarnoff Symposium. 2006: 1-4．
［3］ PRASAD R. OFDM for wireless communications ［M］. Boston: Artech House Publishers, 2004：272．
［4］ ZHANG Jian, LUO Lin, SHI Zhen-ning. Quadrature OFMDA systems ［C］∥ Global Telecommunications Conference, 2007: 3734-3739．
［5］ DAS S S, CARVALHO E, PRASAD R. Variable sub-carrier bandwidths in OFDM ［C］∥Vehicular Technology Conference. Baltimore: ［s. n.］, 2007: 1866-1870．
［6］ TAHIR M, PRIANTORO A U. BER analysis of variable sub-carrier bandwidth OFDMA systems ［C］∥ International Conference on Computer and Communication Engineering. ［S. l.］: ［s. n.］, 2010: 15．
［7］ HAYKIN S S. Cognitive radio: brain-empowered wireless communications ［J］. IEEE Journal on Selected Areas in Communications, 2005, 23(2): 201-220．
［8］ POSTON J D, HORNE W D. Discontinuous OFDM considerations for dynamic spectrum access in idle TV channels ［C］∥ Proceedings IEEE International Symposium New Frontiers Dynamic Spectr. Access Networks, ［S. l.］: ［s. n.］, 2005, 1: 607-610．
［9］ POSTON J D, WEED P J. Live demonstration of DOFDM system ［C］∥ The MITRE Corporation Booth at IEEE MILCOM Conference. ［S. l.］: ［s. n.］, 2002．
［10］ CHAKRAVARTHY V, NUNES A S, STEPHEN J P. TDCS, OFDM and MC-CDMA: a brief tutorial ［J］. IEEE Communications Magazine, 2005, 43(9): 11-16．
［11］ SILVA M W R, REZENDE J F. TDCS: a new mechanism for automatic channel assignment for independent IEEE 80211 networks ［C］∥ Ad Hoc Networking Workshop. Palma de Mallorca, Spain: ［s. n.］, 2009: 27-33．
［12］ WYGLINSKI A M. Effects of bit allocation on non-contiguous multicarrier-based cognitive radio transceivers ［C］∥ Vehicular Technology Conference. Montréal, Québec, Canada: ［s. n.］. 2006: 15．
［13］ HAN C, WANG Jun, GONG Shu-ping, et al. Detection and performance of the OFDM-based transform domain communication system ［C］∥ Communications, Circuits and Systems Proceedings, 2006 International Conference. ［S.l.］, ［s. n.］, 2006, 2: 1332-1336.
[1] 董利达,黄聪,管林波. 基于双树结构的无线HART调度策略[J]. J4, 2014, 48(3): 391-397.
[2] 楼文涛, 张朝阳, 陈少磊, 殷锐. 基于无速率编码的认知无线电系统能量分配算法[J]. J4, 2012, 46(10): 1816-1821.
[3] 周高杯, 宋红军, 邓云凯. 基于波束空间的SAR阵列天线波束展宽方法[J]. J4, 2011, 45(12): 2252-2258.
[4] 章翠枝, 陈淑敏, 于强, 梁书成, 徐元欣. 基于AF中继的OFDM认知系统的
功率分配和子载波配对算法[J]. J4, 2011, 45(12): 2259-2264.
[5] 陈宏. 射频同步开关的硬件电路设计方法[J]. J4, 2011, 45(2): 330-334.