通信系统建模与仿真(别人的借鉴一下)

1、course assignment no.6investigate the pcrfonnancc of the system simulated in assignment5. write a summary report in ms word file containing at least the following items together with the necessary analysis & discussions,1 .system diagram;2.1nput baseband waveform and its power spectrum;3. qpsk m

2、odulated signal and its power spectrum;4. awgn channel output and its power spectrum;5.signal constellations before and after the rayleigh channel;6. error performance (ber-ebnocurves) under the awgn and rayleigh (ricean, optional) fading channels, together with the theoretical awgn curve all ber-eb

3、nocurves should be drawn in one figure with the same scaling.please compress your report (.doc) and source program (.m) files into a single zip (or .rar) file, then submit it by uploading to the school website in your own account.通信系统建模与仿真作业徐亚冲（通信与信息系统）学号：07041045qpsk载波调制1结构框图发送端threshold)接收端2 程序实现见

4、 qpskmodelmain.m3仿真波形(1) 系统基带波形和功率谱基皆信号波形5 0 5<5o.-9010070102030405060基带信号的功率谱0.511.522.53frequency (hz)43.54.5520406020o80(zh'mp)2?一su<dq _boodcd<d岂 d(2) 系统调制后的波形和功率谱50qpsk调制后波形345687505 oo.910qpsk调制后功率谱1.522.53freque ncy (hz)3.54.55o o o o o 2 2 4 6 (zh'mp)>一su2q -eoodo<d$ba(3) 系统通过awgn信道的波形和功率谱6 4 2 o-2-4nh/8p) qsuqq _eo2dw靳moa经过awgn信道后的信号功率谱1.522.533.544.55freque ncy (hz)(4) 系统通过瑞丽信道前后的星座图经过高斯信道后的犀座图经过瑞利信道后的星座图二、误码率仿真(1)结构图dataawgn channelrayleigh fading channel(2) 程序实现见 qpsk_system_ber_simulation.m(3) 仿真波形谋码/符号率for