CAJ | 학술논문

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%.
연구료시불변신도하돌발식정교빈분복용(OFDM)통신계통적신도고계문제,침대재돌발식OFDM통신계통중불동시각발송적정존재불동적채양기시시각편차화재파기시상위편차,사각정적신도고계결과난이피기타정이용적정황,제출료일충기우대채양기시시각편차화재파기시상위편차진행고계여규정적신도고계방법.해방법대수궤전수적물리층정지간적채양기시시각편차이급재파기시상위편차적차치진행고계화규정,사각정획득통일적채양기시시각화재파기시상위,종이사불동정적신도고계결과가이호상이용,종이제고신도고계결과적정도.방진결과표명,저충신도고계방법가사계통적오마성능제고약1dB,병차가사계통적전수효솔제고약10%.
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%.