| TDS-OFDM系统的载波间干扰消除方法 |
| |
| 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)网络.预览,2007(4). |
| |
| 作者姓名： | 符剑 王军 潘长勇 彭克武 |
| |
| 作者单位： | 清华大学电子工程系 北京100084 |
| |
| 基金项目： | 国家自然科学基金资助项目(60372007) |
| |
| 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,该文建立了TDS-OFDM在时变信道下的系统传输模型,在此基础上采用了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2dB以上的误码率性能增益,并且复杂度与传统方法相当。
|
| 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 |
Interchannel interference cancellation method for TDS-OFDM systems |
| |
| Authors: | FU Jian WANG Jun PAN Changyong PENG Kewu |
| |
| 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. |
| |
| Keywords: | channel estimation interchannel interference (ICI) cancellation TDS-OFDM pseudo-random number (PN) sequence |
| 本文献已被 CNKI 等数据库收录！ |
