[1] Han Bing, Gao Xiqi, You Xiaohu,. An enhanced iterative joint channel estimationand symbol detection algorithm for OFDM systems [J]. Journal of Southeast University (English Edition), 2003, 19 (2): 103-107. [doi:10.3969/j.issn.1003-7985.2003.02.001]
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An enhanced iterative joint channel estimationand symbol detection algorithm for OFDM systems(
)
OFDM系统改进的迭代联合信道估计与符号检测算法
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 19
- Issue:
- 2003 2
- Page:
- 103-107
- Research Field:
- Information and Communication Engineering
- Publishing date:
- 2003-06-30
Info
- Title:
- An enhanced iterative joint channel estimationand symbol detection algorithm for OFDM systems
- OFDM系统改进的迭代联合信道估计与符号检测算法
- Author(s):
- Han Bing, Gao Xiqi, You Xiaohu
- National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
- Keywords:
- OFDM; channel estimation; iteration; multipath fading channel
- PACS:
- TN911.5
- DOI:
- 10.3969/j.issn.1003-7985.2003.02.001
- Abstract:
- For orthogonal frequency division multiplexing(OFDM)wireless communication, the system throughput and data rate are usually limited by pilots, especially in a high mobility environment. In this paper, an enhanced iterative joint channel estimation and symbol detection algorithm is proposed to enhance the system throughput and data rate. With lower pilot power, the proposed scheme increases system throughput firstly, and then the channel estimation and symbol detection proceed iteratively within one OFDM symbol to improve the BER performance. In the proposed algorithm, the original channel estimate of each OFDM symbol is based on the channel estimate of the previous OFDM symbol, thus the variation of the mobile channel is traced efficiently, so the number of pilots in the time domain can be reduced greatly. Besides reducing the system overhead, the proposed algorithm is also shown by simulation to give much better BER performance than the conventional iterative algorithm does.
- 在正交频分复用(OFDM)无线通信系统中, 系统的吞吐量和数据速率受到导频因素的制约, 这种情况在高速移动环境下尤为明显.本文提出了一种改进的迭代联合信道估计与符号检测算法, 以提高系统的吞吐量和数据速率.首先降低导频功率来提高系统的吞吐量, 然后在一个OFDM符号内, 通过迭代进行的信道估计与符号检测来提高系统的误码率.每个OFDM符号的初始信道估计值取自上一个OFDM符号的信道估计, 从而该算法能有效地跟踪衰落信道的变化, 因此导频的数目可以大大降低.仿真结果显示, 与传统的迭代算法相比, 本文提出的
References:
[1] Bingham J A C. Multicarrier modulation for data transmission: an idea whose time has come [J]. IEEE Commun Mag, 1990, 28(5):5-14.
[2] Nee R, Prasad R. OFDM wireless multimedia communications[M]. Boston London: Artech House, 1999. 39-42.
[3] Li Y, Cimini L J, Sollenberger N R. Robust channel estimation for OFDM systems with rapid dispersive fading channels [J]. IEEE Trans on Com, 1998, 46(7): 902-915.
[4] Tong L, Xu G, Kailath T. Blind identification and equalization based on second-order statistics: a time domain approach [J]. IEEE Trans Inform Theory, 1994, 40(3): 340-350.
[5] Moeher M L, Lodge J H. TCMP — a modulation and coding strategy for Rician fading channels [J]. IEEE J Sel Areas Com, 1989, 7(12): 1347-1355.
[6] Hoeher P, Kaiser S, Robertson I. Two-dimensional pilot-symbol-aided channel estimation by Wiener filtering [A]. In:IEEE Proc ICASSP’97[C]. 1997.1845-1848.
[7] Edford O, Sandell M, Beek J J, et al. Analysis of DFT-based channel estimators for OFDM[R]. Research Report TULEA Div of Signal Processing, Lule(。overa)University of Technology, 1996.
[8] Hang Bing, Wang Jianming, Gao Xiqi, et al. An iterative joint channel estimation and symbol detection algorithm for OFDM systems [J]. Journal of China Institute of Communications, 2003.(in Chinese)
[9] García M J F, Páez-Borrallo J M, Zazo S. DFT-based channel estimation in 2D-pilot-symbol-aided OFDM wireless systems [A]. In: IEEE Proc VTC’01 Spring [C]. 2001. 810-814.
Memo
- Memo:
- Biographies: Han Bing(1974—), female, graduate; You Xiaohu(corresponding author), male, doctor, professor, xhyu@seu.edu.cn.