代码为实现EM算法进行ofdm调制信号进行信道估计的仿真代码-source codes simulate the channel estimation using em algorithm

低密度奇偶检验码与分层空时码的级联仿真，具有很高的价值，希望对大家有用。-Low-density parity check codes and layered space-time codes of the cascade simulation, with a very high value and hope for all of us.