摘要: |
由于载波间干扰(ICI)是影响正交频分复用(OFDM)系统性能的重要因素,一般消除ICI时作信道估计都采用辅助导频的方法,需要使用大量的离散导频,为此提出了一种对MIMO信道中ICI消除的时域均衡方法。该方法利用MIMO空时检测后的数据信息迭代回去,当作导频符号估计出时变信道的冲激响应,然后通过时域均衡消除ICI,而无需额外的导频,在改善系统误误码率的同时,提高了频谱的利用率。 |
关键词: 载波间干扰 时域均衡 |
DOI:10.3969/j.issn.1001-893X. |
投稿时间:2005-08-16修订日期:2005-12-28 |
基金项目:国家高技术研究发展计划(863计划);国家自然科学基金 |
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Intercarrier Interference (ICI) Cancellation by Time-Equalization in MIMO-OFDM Systems |
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Abstract: |
For orthogonal frequency-division multiplexing(OFDM) communication systems,a loss of subcarrier orthogonality due to time-variant multipath channel leads to intercarrier interference(ICI).This paper studies an ICI cancellation method for multiple input multiple output(MIMO) system by time-domain equalization.To gain the optimal filter coefficient,the channel information should be estimated.In this paper,the data information is used after MIMO detection as scatter pilot to perform time-variant channel estimation.It needs no any extra pilot information,and can improve the system bandwidth utilization. |
Key words: OFDM MIMO |