Email: xuzhikun@ee.buaa.edu.cn
Tel: 86-10-82317213-810  
Address: 北京航空航天大学203教研室, 100191  
Group 203, Beihang University,  
Beijing 100191, China

Education

• Sep 2007-present, Ph.D candidate, School of Electronics and Information Engineering, Beihang University
  Sep 2009-Sep 2010, Visiting student, Georgia Institute of Technology, USA
  Sep 2003-Jun 2007, B.S, School of Advanced Engineering, Beihang University (BUAA)  

Research Interest

• Cognitive radio, Cross-layer optimization, Inter-cell interference coordination, Green radio, etc.

Awards and honors

• 2011: Innovation Funding of BUAA for Ph. D Graduates, & Best Paper Award of BUAA
  2010: Fourth-class Prize of Airbus Scholarship
  2009: Scholarship from the State Scholarship Fund
  2007: Gold Medal Prize of BUAA & Excellent Thesis for Bachelor Degree
  2006: First-class Prize of Electronic Design Competition, Beijing
  2005: First-class BUAA Academic Scholarship
  2004: First-class Prize of Mathematics of College Students & First-class Prize of Physics of College Students, Beijing  

Publications

Journal Papers

1. Chuting Yao, Z. Xu, T. Liu, and C. Yang, “Is Accumulative Information Useful For Designing Energy Efficient transmission?”,  IEEE Trans. On Communications, vol.63, no. 2, pp. 401-415, Feb. 2015.

2. Z. Xu, C. Yang, G. Y. Li, Y. Liu, and S. Xu, “ Energy-Efficient CoMP Precoding in Heterogeneous Networks”, IEEE Trans. on Signal Processing,  Vol. 62, No. 4, Feb., 2014,  pp1005-1017.

3. Z. Xu and C. Yang, “Secondary Transceiver Design in the Presence of Frequency Offset between Primary and Secondary Systems,” IEEE Trans. Wireless Commun., vol. 9, no. 11, pp. 3461-3471, Nov. 2010.

4. Z. Xu, G. Y. Li, C. Yang, S. Zhang, Y. Chen, and S. Xu, “Energy-Efficient Power Allocation for Pilots in Training-Based Downlink OFDMA Systems,” IEEE Trans. Commun., vol. 60, no. 10, pp. 3047-3058, Oct. 2012.

5. Z. Xu, C. Yang, G. Y. Li, S. Zhang, Y. Chen, and S. Xu, “Energy-Efficient Configuration of Spatial and Frequency Resources in MIMO-OFDMA Systems,” IEEE Trans. Commun., vol. 61, No. 2, Feb., 2013, pp 564 – 575.

6. Z. Xu, G. Y. Li, C. Yang, and X. Zhu, “Throughput and Optimal Threshold for FFR Schemes in OFDMA Cellular Networks,” IEEE Trans. Wireless Commun., vol. 11, no. 8, pp. 2776-2785, Aug. 2012.

7. G. Y. Li, Z. Xu, C. Xiong, C. Yang, S. Zhang, Y. Chen, and S. Xu, “Energy-Efficient Wireless Communications:  Tutorial, Survey, and Open Issues,” IEEE Wireless Commun. Mag., vol. 18, no. 6, pp. 28–35, Dec. 2011.

8. 凌为、韩圣千、徐志昆、杨晨阳, “异构网中宏、微基站间存在频偏时的干扰协调方法”, 电子信息学报, 34(3): 670-676, 2012。

9. 刘鑫, 韩圣千, 徐志昆, 杨晨阳. 面向下行多天线传输的能效最优上行训练, 北京航空航天大学学报, 已录用.

Conference Papers

1. C. Yao, Z. Xu, T. Liu, C. Yang, “When Accumulative Information is Beneficial for Maximizing Energy Efficiency?”, in Proc. IEEE ICC 2014.

2. Z. Xu, C. Yang, G. Y. Li, Y. Liu, and S. Xu, “Energy-Efficient Cooperative Transmission in Heterogeneous Networks,” in Proc. IEEE WCNC, Apr. 2013.

3. Z. Xu, C. Yang, G. Y. Li, S. Zhang, Y. Chen, and S. Xu, “Energy-Efficient Configuration of Spatial and Frequency Resources in MIMO-OFDMA Systems” in Proc. IEEE ICC, Jun. 2012.

4. C. She, Z. Xu, C. Yang, S. Han, C. Sun, and Q. Wu, “Energy-Efficient Configuration of Frequency Resources in Multi-Cell MIMO-OFDM Networks”, in Proc. IEEE PIMRC, Sep. 2012.

5. Z. Xu, G. Y. Li, C. Yang, S. Zhang, Y. Chen, and S. Xu, “Optimal Threshold Design for FFR Schemes in Multi-Cell OFDMA Networks,” in Proc. IEEE ICC, Jun. 2011.

6. Z. Xu, G. Y. Li, C. Yang, S. Zhang, Y. Chen, and S. Xu, “Energy-efficient MIMO-OFDMA systems based on switching off RF chains,” in Proc. IEEE VTC, Sep. 2011.

7. Z. Xu, C. Yang, G. Y. Li, S. Zhang, Y. Chen, and S. Xu, “Power Allocation between Training and Data Symbols based on Energy Efficiency,” in Proc. IEEE GlobeCom, Dec. 2011.

8. Z. Xu and C. Yang, “Secondary Transceiver Design in the Presence of Frequency Offset between OFDM-Based Primary and Secondary Systems,” in Proc. IEEE ICC, May 2010.

国家发明专利（Patent）

1. 侯雪颖, 徐志昆, 凌为, 杨晨阳, 王大飞, 沈东栋, “一种基于HeNB主动认知的干扰协调方法: 装置及系统”, 国家发明专利, 申请号: 201010230123.6

教育经历

• 2007.09-今: 北京航空航天大学电子信息工程学院, 免试直博
  2009.09-2010.09: 美国佐治亚理工学院, 国家公派访问学生
  2003.09-2007.07: 北京航空航天大学     高等工程学院工学学士  

研究方向

• 认知无线电、跨层优化设计、多小区干扰协调技术、绿色通信等

研究成果

• 发表期刊论文7篇; 发表会议论文7篇; 申请国家发明专利3项;

科研与工程项目

1. 超宽带通信系统设计, 研究成员, 研究所合作项目, 2007.09～2008.07
   研究超宽带系统的传输体制;
   设计抗符号间干扰的均衡算法;
   研究适合超宽带信道特点的调制编码方式。  

2. 认知系统收发机设计, 研究成员, 新一代宽带无线移动通信网科技重大专项, 2008.09-2009.07
   研究在主次系统间频率不同步时, 基于最小均方误差准则的次用户系统的收发机设计。  

3. 蜂窝网中干扰协调策略研究, 研究成员, 公司合作项目, 2009.09-2010.04
   研究在多小区蜂窝系统中, 在不同调度方式下, 分数频率复用技术的容量以及用于划分中心用户和边缘用户的门限设计。  

4. MIMO-OFDMA系统的高能效设计, 研究成员, 国家自然科学基金重大国际合作项目, 国家重点基础研究发展计划（973）, 2010.05-至今
   提出导频信号与数据间的高能效功率控制方案;
   研究MIMO-OFDMA系统的高能效空频资源分配;
   设计异构网中高能效的MIMO协作传输方案。  

所获奖励

• 2012：北航研究生国家奖学金
  2011: 北航博士创新基金&优秀学术论文奖
  2010: 空客奖学金四等奖
  2009: 国家公派留学奖学金
  2007: 北航金质奖章&优秀本科毕业论文
  2006: 北京市电子设计竞赛一等奖
  2005: 北航学习优秀奖一等奖
  2004: 北京市数学竞赛一等奖&北京市物理竞赛一等奖  

学术活动和社会实践

• 2011年06月, 前往日本京都参加IEEE国际通信大会 (ICC)
  2011年12月, 前往美国休斯敦参加IEEE全球通信大会(GLOBECOM)
  IEEE Trans. on Wireless Communications, Vehicular Technology、通信学报等期刊评审人