计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2010年
7期
11-14,17
,共5页
正交频分复用%时间偏移估计%符号序列
正交頻分複用%時間偏移估計%符號序列
정교빈분복용%시간편이고계%부호서렬
Orthogonal Frequency Division Multiplexing(OFDM)%timing offset estimation%symbol sequence
针对受到传播时延、多普勒效应等因素影响的正交频分复用(OFDM)无线系统时间偏移问题,提出了一种基于训练符号序列相关性的时间偏移估计算法CBT.该算法通过对训练符号序列的简单构造,利用其相关性通过时间尺度的最大值找到符号的起始点,实现时间偏移估计,进而有效地提高OFDM系统抗时间偏移的能力.详细的仿真实验以及与现有PML算法的性能比较表明,提出的时间偏移估计算法CBT在加性高斯白噪声(AWGN)与瑞利衰落信道下都明显地减小了时间偏移误差.
針對受到傳播時延、多普勒效應等因素影響的正交頻分複用(OFDM)無線繫統時間偏移問題,提齣瞭一種基于訓練符號序列相關性的時間偏移估計算法CBT.該算法通過對訓練符號序列的簡單構造,利用其相關性通過時間呎度的最大值找到符號的起始點,實現時間偏移估計,進而有效地提高OFDM繫統抗時間偏移的能力.詳細的倣真實驗以及與現有PML算法的性能比較錶明,提齣的時間偏移估計算法CBT在加性高斯白譟聲(AWGN)與瑞利衰落信道下都明顯地減小瞭時間偏移誤差.
침대수도전파시연、다보륵효응등인소영향적정교빈분복용(OFDM)무선계통시간편이문제,제출료일충기우훈련부호서렬상관성적시간편이고계산법CBT.해산법통과대훈련부호서렬적간단구조,이용기상관성통과시간척도적최대치조도부호적기시점,실현시간편이고계,진이유효지제고OFDM계통항시간편이적능력.상세적방진실험이급여현유PML산법적성능비교표명,제출적시간편이고계산법CBT재가성고사백조성(AWGN)여서리쇠락신도하도명현지감소료시간편이오차.
To frequency and timing offsets problem caused by propagation delay and Doppler effect in OFDM wireless systems, based on correlation of training symbol sequence,an efficient timing offsets estimation algorithm called CBT is proposed.To improve the ability of anti-timing offsets,the proposed CBT constructs a simple training symbol sequence,and estimates timing offsets by correlation of the training symbol sequence to find the starting point of the symbol at the maximum point of the timing metric.Detailed simulation results and comparison with an existed PML algorithm prove that the proposed CBT algorithm obviously decreases the errors of timing offsets in AWGN and Rayleigh-fading channels.
