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OFDMA上行多用户交织信号同步与分离 被引量：1

Multi-User Signal Synchronization and Separation for the Interleaved OFDMA Uplink
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摘要 研究了正交频分多址接入(OFDMA)上行链路中采用交织子载波分配方案的多用户信号同步及分离.采用交织子载波分配方案的OFDMA上行链路中,每个用户信号在1个OFDM符号内都具有一定的周期性结构.首先利用信号的结构特性,并借助子空间的方法估计得到多用户的频率偏移;然后,对接收到的信号应用最小均方误差(MMSE)滤波恢复单用户信号波形,实现了多用户信号分离及频率同步;最后,基于恢复的单用户训练信号对每个用户的时间偏移进行估计.广义线性调频序列(GCL)具有理想的周期自相关特性、最优的互相关特性和低峰均功率比特性,因而被用作训练序列来估计每个用户的时间偏移.仿真结果表明,本方案在多径衰落信道下是有效的. Multi-user signal synchronization and separation for the interleaved orthogonal frequency division multiplexing （OFDMA） uplink are investigated. In interleaved OFDMA uplink, each user＇ s signal has a special periodic structure within an OFDMA block. Firstly, by utilizing the signal structure characteristic and subspaee-based method, multi-users＇ carrier frequency offsets can be obtained. Next, minimum mean square error （MMSE） filters are applied to the received signal to recover single user signal wave thus implementing user separation and frequency synchronization at the same time. Finally, based on the recovered single user training signal, each user＇ timing offset can be estimated. The generalized chirp-like （GCL） sequence has the ideal periodic auto-correlation function, optimum periodic cross-correlation function and low peak-average power ratio （PAPR）. Therefore, GCL sequences are used as training sequences to estimate each user＇ timing offset. Simulation results show the proposed scheme is effective in multi-path fading channels.
作者 苏环 张建华 张平
机构地区 北京邮电大学电信工程学院
出处 《北京邮电大学学报》 EI CAS CSCD 北大核心 2006年第4期115-118,共4页 Journal of Beijing University of Posts and Telecommunications
基金 国家自然科学基金项目(60302025)
关键词 正交频分多址接入 广义线性调频序列 载波频率偏移估计 多用户信号分离 orthogonal frequency division multiplexing generalized chirp like sequence carrier frequency offset estimation multi-user signal separation
分类号 TN911.23 [电子电信—通信与信息系统]
  • 相关文献

参考文献6

  • 1张中山,刘晓明,赵明,刘元安,高锦春.OFDM系统中快速频偏估计[J].北京邮电大学学报,2004,27(5):41-44. 被引量：4
  • 2李伟华,章蓓蕾,吴伟陵.OFDM系统定时与频率偏移估计[J].北京邮电大学学报,2004,27(1):36-39. 被引量：16
  • 3Beek J J, Borjesson P O, Boucheret M L, et al. A time and frequency scheme for multiuser OFDM [J]. IEEE Journal on Selected Areas in Communications, 1999, 17(11): 1900-1914.
  • 4Morelli M. Timing and frequency synchronization for the uplink of an OFDMA system[J]. IEEE Transactions on Communications, 2004, 52(2): 296-306.
  • 5Cao Zhongren, Turell U, Yao Yudong. Analysis of two receiver schemes for interleaved OFDMA uplink [C] // Conference Record of the Thirty-Sixth Asilomar Conference on Systems and Computer. California: [s. n.], 2002: 1818-1821.
  • 6Popovic B M. Generalized chip-like polyphase sequences with optimal correlation properties [J]. IEEE Transactions on Information Theory, 1992, 38(4) : 1406-1409.

二级参考文献10

  • 1[1]Van de Beek J J.ML estimation of time and frequency offset in OFDM systems[J].IEEE Transactions on Signal Processing,1997,45(7):1 800-1 805.
  • 2[2]Tureli U,Liu H,Zoltowski M D.OFDM blind carrier offset estimation:ESPRIT[J].IEEE Transactions on Communications,2000,48(9):1 459-1 461.
  • 3[3]Ramasubramanian K,Baum K.An OFDM timing recovery scheme with inherent delay-spread estimation[A].Global Telecommunications Conference[C].2001.3 111-3 115.
  • 4BINGHAM J. Multicarrier modulation for data transmission: an idea whose time has come [J]. IEEE Commun Mag,1990,28:17-25.
  • 5MOOSE P. A technique for orthogonal frequency division multiplexing frequency offset correction [J]. IEEE Trans Comm,1994,42:2908-2914.
  • 6BEEK J.J. ML estimation of time and frequency offset in OFDM systems [J]. IEEE Trans Signal Processing,1997,45:1800-1805.
  • 7SCHMIDL T. Robust frequency and timing synchronization for OFDM [J]. IEEE Trans Comm,1997,45:1613-1621.
  • 8LOUISE M. Carrier frequency acquisition and tracking for OFDM systems [J]. IEEE Trans Comm,1996,44:1590-1598.
  • 9RIFE D. Single-tone parameter estimation from discrete-time observations [J]. IEEE Trans Inform Theory, 1974,IT-20:591-598.
  • 10李伟华,章蓓蕾,吴伟陵.OFDM系统定时与频率偏移估计[J].北京邮电大学学报,2004,27(1):36-39. 被引量：16

共引文献17

同被引文献7

  • 1Zhao P, Kuang L. Carrier frequency offset estimation using extended Kalman filter in uplink OFDMA systems[ C]// ICC 2006. Istanbul: Turkey, 2006: 2870-2874.
  • 2Kim K J, Iltis R A. Frequency offset synchronization and channel estimation for the MIMO-OFDM system using Rao-Blackwellized Gauss-Hermite filter [ C ]// WCNC 2006. Las Vegas: USA, 2006: 860-865.
  • 3Kim K J, Iltis R A. A sequential Monte-Carlo Kalman filter based frequency offset and channel estimation method in the MIMO-OFDM system[C]// VTC 2005- Fall. Dallas: [s.n. ], 2005: 277-281.
  • 4Murphy K, Russell S. Rao-Blaekwellized particle filtering for dynamic Bayesian networks [ M ]. New York: Springer-Verlag, 2001: 587-633.
  • 5Choi S, Cichocki A, Amari S. Flexible independent component analysis[J]. Journal of VLSI Signal Processing, 2000, 26(1): 25-38.
  • 6Park S, Choi S. Rao-Blackwellized particle filter for sequential speech enhancement [ C ]// IJCNN 2006. Vancouver: [s.n. ], 2006: 1254-1259.
  • 7IEEE Std 802. 16e-2005 and IEEE Std 802.16-2004/ Corl-2005, IEEE standard for local and metropolitan area networks-Part 16: Air interface for fixed and mobile broadband wireless access systems-amendment 2: physical and medium access control layers for combined fixed and mobile operation in licensed bands[S]. New York: [s. n. ], 2006.

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北京邮电大学学报
2006年 第4期

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