一种OFDM系统中的盲信道估计算法
A blind channel estimation algorithm for an OFDM system
-
摘要: 该文利用OFDM系统传输的信息符号为有限字符集和各子载波的相互独立特性，提出了用伪导频符号(PPS)进行信道的盲估计算法。与用于做信道估计的导频符号不同，PPS传输的是有用的数据，因此提高了系统的带宽利用率，PPS的平均功率增加3dB或6dB可有效抑制信道的加性高斯噪声。对信道盲估计的均方误差(MSE)和由此算法获得的信道的状态信息对无编码的OFDM系统进行解调的误比特率进行了仿真，结果表明提出的算法是有效的并具有很好的灵活性。
-
关键词:
- 盲信道估计; OFDM; 伪导颁符号
Abstract: In this paper, a blind channel estimator based on the aid of Pscudo-Pilot-Symbols (PPS) is proposed in terms of the two characters of OFDM system: the finite alphabet property of information symbols and independent property between subchannels. Unlike pilots which are used for estimation of channel and must waste some useful bandwidth, the PPSs, whose power can be boosted 3dB or 6dB to suppress efficiently the additive noise, is useful data transmitted, thus efficiency of the OFDM has been increased. Performance simulation of the proposed estimator including Mean Squares Error (MSE) of channel and uncoded Bit Error Rate(BER) have been taken, and the results show the estimator is efficient and very flexible. -
R.D.J. Van Nee, G. A. A. Water, et al., New high-rate wireless LAN standards, IEEE Communications Mag., 1999, 37(12), 82-88.[2]Digital Broadcasting Systems for Television, Sound and Data Services, pr ETS 300 744 1996.[3]B. Muquet, M. de Courville, Blind and semi-blind channel identification methods using second order statistics for OFDM systems, Proc. ICASSP99, Phoenix, Arizona, U.S.A., 1999, 5, 2745-2748.[4]B. Muquet, M. de Courville, P. Duhamel, V. Buzenac, A subspace based blind and semi-blind channel identification method for OFDM systems, Second IEEE Workshop on SPQWC, 1999,170-173.[5]R.W. Heath, Jr., G. B. Giannakis, Exploiting input cyclostationarity for blind channel identification in OFDM system, IEEE Trans. on Sig. Processing, 1999, 47(3), 848-856.[6]John G. Proakis, Digital Communication, Third Edition, McGraw-Hill Publishing Corp., Chapter 14.[7]J.K. Moon, S. Chio, Performance of channel estimation methods for OFDM systems in multipath fading channels, IEEE Tran. on Consumer Electronics, 2000, 46(1), 161-170.[8]Shengli Zhou, G. B. Giannakis, A. Scaglione, Long codes for generalized FH-OFDMA through unknown multipath channels, IEEE Trans. on Communications, 2001, 49(4), 721-733. 期刊类型引用(1)
1. 刘德渊，张金全，张鑫，万武南，张仕斌，秦智. 基于无证书签密的跨链身份认证方案. 计算机应用. 2024(12): 3731-3740 . 
百度学术其他类型引用(0)
-
百度学术
计量
- 文章访问数: 2162
- HTML全文浏览量: 168
- PDF下载量: 914
- 被引次数: 1
下载:
