| TDS-OFDM系统的载波间干扰消除方法 |
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| 引用本文： | 符剑,王军,潘长勇,彭克武.TDS-OFDM系统的载波间干扰消除方法[J].清华大学学报(自然科学版),2007,47(4):573-577. |
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| 作者姓名： | 符剑 王军 潘长勇 彭克武 |
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| 作者单位： | 清华大学,电子工程系,北京,100084 |
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| 摘 要： | 为了消除时域同步正交频分复用(TDS-OFDM)系统中的载波间干扰(ICI),通过假定信道在OFDM块内呈线性变化,建立了TDS-OFDM在时变信道下的系统传输模型,在此基础上采用一种决策反馈的方法来消除ICI。该方法使用伪随机(PN)序列时域相关进行信道粗估计,并在一个OFDM块内进行线性内插得到整个OFDM块内的信道细估计。分析和仿真结果表明,该方法相对于TDS-OFDM系统的传统方法有2 dB以上的误码率性能增益,并且复杂度与传统方法相当。
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| 关 键 词： | 信道估计 载波间干扰消除 时域同步正交频分复用 伪随机序列 |
| 文章编号： | 1000-0054(2007)04-0573-05 |
| 修稿时间： | 2006年3月6日 |
Interchannel interference cancellation method for TDS-OFDM systems |
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| FU Jian,WANG Jun,PAN Changyong,PENG Kewu.Interchannel interference cancellation method for TDS-OFDM systems[J].Journal of Tsinghua University(Science and Technology),2007,47(4):573-577. |
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| Authors: | FU Jian WANG Jun PAN Changyong PENG Kewu |
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| Abstract: | An interchannel interference(ICI) cancellation method was developed for time-domain synchronous orthogonal frequency-division multiplexing(TDS-OFDM) systems using a system transfer model derived for TDS-OFDM.The ICI cancellation method uses decision feed back based on the assumption that channel variations are linear within an OFDM block.Coarse channel estimates are based on a time-domain correlation of a pseudo-random number(PN) sequence with linear interpolation for the fine channel estimates over an OFDM block.Simulation results show that the method gives a bit error rate performance improvement of above 2 dB with comparative computational complexity against conventional methods used in TDS-OFDM systems. |
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| Keywords: | channel estimation interchannel interference(ICI) cancellation TDS-OFDM pseudo-random number(PN) sequence |
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