虚拟子载波OFDM系统中一种新的导频设计方法

his paper proposes a new pilot design method for orthogonal frequency division multiplexing (OFDM) systems with virtual subcarriers. The proposed scheme minimizes a simple function relevant to the mean-square error (MSE) of the least squares (LS) channel estimate instead of minimizing the MSE itself. By sequentially solving several one-dimensional optimization problems, the suboptimal pilot subcarriers can be obtained efficiently. The simulation results show that, compared with the conventional partially equispaced pilot design, the proposed scheme can provide much more accurate channel estimation when the channel length is large.