对HARQ系统的吞吐量分析，ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块，非归零型差分相位调制信号建模与仿真分析 。- HARQ throughput analysis of the system, ofdm system simulation including 16qam modulation fft windowing modules plus cp, NRZ type differential phase modulation signal modeling and s