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信道的时变特性是提高移动通信系统容量和可靠性的主要障碍。由于无线传播环境的复杂性,无线移动通信的信道特性通常是时变的,因此快速准确的信道估计对于提高通信系统的性能是十分必要的。本文首先详细分析了多用户多天线传输信道模型,并在此基础上给出了TDD模式下基于训练序列的信道估计算法,最后得到了最大似然估计准则下传输信道的估值函数。
The time-varying nature of the channel is a major obstacle to increasing the capacity and reliability of the mobile communication system. Due to the complexity of wireless communication environment, the channel characteristics of wireless mobile communication are usually time-varying, so fast and accurate channel estimation is very necessary to improve the performance of communication system. In this paper, the multi-user multi-antenna transmission channel model is analyzed in detail. On the basis of this, a channel estimation algorithm based on training sequence in TDD mode is given. Finally, the estimation function of the transmission channel under the maximum likelihood estimation criterion is obtained.