【摘要】 对垂直分层空时码系统进行信道估计时,常需采用训练序列,发射天线个数的增加会使得所需的训练符号个数增加,减少了传输数据的有效时间。本文将信号处理中的子空间方法同分层空时码的编码结构相结合,提出了一种垂直分层空时编码,实现了无需训练序列的信道估计。Monte Carlo仿真结果表明,在相干时间允许的范围内,利用本文算法估计出的信道进行信号检测时,其性能十分接近使用准确信道信息的检测结果。更多还原

【Abstract】 Vertical layered spacetime codes assumed that training symbols are available at the receiver for channel estimation. Increasing the number of antennas increases the required training interval and reduces the available time in which data may be transmitted before the fading coefficients change. In this paper, by combining the subspace method with layered space-time codes, we propose a vertical layered space-time code and accomplish the channel estimation without the training symbols. From Monte Carlo simulations, we show that under the condition of coherence time in the current communication environment, the performance of symbol detection with our estimated channel approaches that with perfect knowledge of the channel.更多还原