| 吴毅凌,李红滨,赵玉萍.一种适用于时不变信道的信道估计方法[J].高技术通讯(中文),2010,20(1):1~7 |
| 一种适用于时不变信道的信道估计方法 |
| A novel channel estimation method for time invariant channels |
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| DOI： |
| 中文关键词: 正交频分复用(OFDM)， 信道估计， 采样起始时刻偏差， 载波起始相位偏差 |
| 英文关键词: orthogonal frequency division multiplexing (OFDM), channel estimation, initial sampling offset, initial carrier phase offset |
| 基金项目:863计划(2007AA01Z231)资助项目 |
| 作者 | 单位 | | 吴毅凌 | 北京大学信息科学技术学院 | | 李红滨 | 北京大学信息科学技术学院 | | 赵玉萍 | 北京大学信息科学技术学院 |
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| 摘要点击次数: 3032 |
| 全文下载次数: 2147 |
| 中文摘要: |
| 研究了时不变信道下突发式正交频分复用(OFDM)通信系统的信道估计问题，针对在突发式OFDM通信系统中不同时刻发送的帧存在不同的采样起始时刻偏差和载波起始相位偏差，使各帧的信道估计结果难以被其它帧利用的情况，提出了一种基于对采样起始时刻偏差和载波起始相位偏差进行估计与纠正的信道估计方法。该方法对随机传输的物理层帧之间的采样起始时刻偏差以及载波起始相位偏差的差值进行估计和纠正，使各帧获得统一的采样起始时刻和载波起始相位，从而使不同帧的信道估计结果可以互相利用，从而提高信道估计结果的精度。仿真结果表明，这种信道估计方法可使系统的误码性能提高约1dB，并且可使系统的传输效率提高约10%。 |
| 英文摘要: |
| This paper studies the channel estimation of burst mode orthogonal frequency division multiplexing (OFDM) communication systems under time invariant channels. A channel estimation method based on the estimation and correction of initial sampling offset and initial carrier phase offset is proposed based on the consideration that in burst mode communication systems there exist different initial sampling offsets and initial carrier phase offsets between frames transmitted at different times, leading to the channel estimation results of different frames are hard to be used by each other. This paper analyzes the effect of these two offsets to OFDM signals, and proposes a corresponding estimation and correction method. The proposed method makes the channel estimation results of different frames be used by each other. As the simulation results show, the proposed channel estimation method gains about 1dB improvement on BER performance. Besides, the transmission efficiency of communication systems is also increased by about 10%. |
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