[1] Jing Ya, Xu Xiaodong, Chen Ming, Cheng Shixin, et al. Iterative receivers for SFBC-OFDM systemswith adaptive training scheme [J]. Journal of Southeast University (English Edition), 2005, 21 (2): 127-131. [doi:10.3969/j.issn.1003-7985.2005.02.002]
Copy
Iterative receivers for SFBC-OFDM systemswith adaptive training scheme(
)
SFBC-OFDM 系统中基于自适应训练机制的迭代接收机
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 21
- Issue:
- 2005 2
- Page:
- 127-131
- Research Field:
- Information and Communication Engineering
- Publishing date:
- 2005-06-30
Info
- Title:
- Iterative receivers for SFBC-OFDM systemswith adaptive training scheme
- SFBC-OFDM 系统中基于自适应训练机制的迭代接收机
- Author(s):
- Jing Ya; Xu Xiaodong; Chen Ming; Cheng Shixin
- National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
- Keywords:
- space-frequency block-coded orthogonal frequency division multiplexing(SFBC-OFDM); iterative receiver; channel estimation; adaptive training scheme
- PACS:
- TN911.5
- DOI:
- 10.3969/j.issn.1003-7985.2005.02.002
- Abstract:
- This paper considers the design of iterative receivers for space-frequency block-coded orthogonal frequency division multiplexing(SFBC-OFDM)systems in unknown wireless dispersive fading channels.An iterative joint channel estimation and symbol detection algorithm is derived.In the algorithm, the channel estimator performs alternately in two modes.During the training mode, the channel state information(CSI)is obtained by a discrete-Fourier-transform-based channel estimator and the noise variance and covariance matrix of the channel response is estimated by the proposed method.In the data transmission mode, the CSI and transmitted data is obtained iteratively.In order to suppress the error propagation caused by a random error in identifying symbols, a simple error propagation detection criterion is proposed and an adaptive training scheme is applied to suppress the error propagation.Both theoretical analysis and simulation results show that this algorithm gives better bit-error-rate performance and saves the overhead of OFDM systems.
- 研究了在空频块码正交频分复用(SFBC-OFDM)无线通信系统中适用于多径衰落信道下的迭代接收机的设计, 导出了一种迭代的联合信道估计与符号检测的算法.在提出的算法中, 信道估计器交替地工作于2种模式.在训练阶段, 采用基于DFT的估计器估计出信道状态信息, 并且采用所提出的算法估计出噪声方差和信道响应的互相关矩阵.在数据传输模式下, 迭代地获得发送数据和信道状态信息.为了抑制由于符号检测中误判引起的错误传播, 提出了一种简单的错误传播判定准则, 并使用了一种自适应的训练机制来抑制误差传播.仿真结果显示, 与传统的迭代算法相比, 所提出的算法能够提供更好的误码性能, 且节约了系统开销.
References:
[1] Sampath H, Talwar S, Tellado J, et al.A fourth-generation MIMO-OFDM broadband wireless system:design, performance, and field trial results [J].IEEE Commun Mag, 2002, 40(9):143-149.
[2] Sun S, Wiemer I, Ho C K, et al.Training sequence assisted channel estimation for MIMO OFDM [A].In:Proc of IEEE Wireless Communication and Networking Conference [C].New Orleans, 2003, 1:38-43.
[3] Lu B, Wang X, Li Y.Iterative receivers for space-time block-coded OFDM systems in dispersive fading channels [J].IEEE Trans Wireless Commun, 2002, 1(2):213-225.
[4] Lee K F, Williams D B.A space-frequency transmitter diversity technique for OFDM systems [A].In:Proc of IEEE Global Telecommunications Conference [C].San Francisco, 2000, 3:1473-1477.
[5] Alamouti S M.A simple transmit diversity techniques for wireless communications [J].IEEE Journal on Selected Areas in Commun, 1998, 16(18):1451-1458.
[6] Li Y.Simplified channel estimation for OFDM systems with multiple transmit antennas[J].IEEE Trans Wireless Commun, 2002, 1(1):67-75.
[7] Kay S M.Fundamentals of statistical signal processing:estimation theory [M].Englewood Cliffs, NJ:Prentice Hall, 1993.325-327.
[8] Du J X, Li Y.MIMO-OFDM channel estimation based on subspace tracking [A].In:Proc of IEEE Vehicular Technology Conference [C].Jeju, Korea, 2003, 2:1084-1088.
Memo
- Memo:
- Biographies: Jing Ya(1978—), female, graduate;Cheng Shixin(corresponding author), male, professor, sxcheng@seu.edu.cn.