摘要
针对采用梳状导频的MIMO-OFDM系统信道估计问题,提出了一种新的最优导频设计方案,该方案的基本思想是不同发射天线中的导频位置相互正交,对应其他天线导频位置的子载波不被使用。对比传统的最优导频设计方法,所提方案有两个优点,一是它所需非传输信号的子载波数更少,用于传输信号的子载波增加,从而提高了系统频带的利用率。二是当OFDM频带两端设置保护频带时,系统存在一个极限保护频带宽度,在这个极限保护频带宽度范围内可以通过调整导频序列的初始位置来避免部分导频落入保护频带中,对比传统设计方法,此方案所允许的极限保护频带宽度更大。仿真实验验证了此设计方案的有效性。
For the channel estimation of MIMO-OFDM systems, a new scheme of pilot tones design is proposed on the basis of the idea that the pilot positions are orthogonal each other in different antennas, and the subcarriers with respect to the pilot position of other antenna are not used for transmission. Compare to the conventional design method, the scheme presented requires much less nonsignal sub- carriers, thus the subcarriers for signal transmission increase and enhances the using efficiency of frequency band. Maximum guard bandwidth exists in the MIMO- OFDM systems as the both edges of OFDM band are used to be guard band. Comparing with conventional pilot design, the maximum guard bandwidth is much bigger in the proposed scheme. Simulation results demonstrate the effectiveness of the proposed approach.
出处
《电波科学学报》
EI
CSCD
北大核心
2008年第3期501-505,共5页
Chinese Journal of Radio Science
基金
教育部博士点基金资助项目(20050145019)
