通信系统建模与仿真(别人的借鉴一下)

Course Assignment No 6 Investigate the performance of the system simulated in Assignment 5 Write a summary report in MS Word file containing at least the following items together with the necessary analysis 2 Input baseband waveform and its power spectrum 3 QPSK modulated 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 EbNocurves 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通信系统建模与仿真作业 徐亚冲 通信与信息系统 学号 07041045 一 QPSK 载波调制载波调制 1 结构框图结构框图 2sin 2 2 tft cT 1 t 2cos 2 tfc T Non Reture To Zero Llevel Encoder DemultiplexerSi t Binary Data Senquence a2 发送端 y2 Threshold 0 Quadrature Channel In Phase Channel 2 t 1 t T dt 0 Decision Device Mutiplexer Output 接收端 2 程序实现程序实现见 QPSKmodelmain m 3 仿真波形仿真波形 1 系统基带波形和功率谱 y T dt 0 Decision Device Threshold 0 2 系统调制后的波形和功率谱 3 系统通过 AWGN 信道的波形和功率谱 4 系统通过瑞丽信道前后的星座图 二 二 误码率仿真误码率仿真 1 结构图结构图 Mapping circuit Data generator AWGN Decision circuit AWGN Decision circuit Demapping circuit Ich data Qch data Data AWGN channel Mapping circuit Data generator AWGN Decision circuit AWGN Decision circuit Demapping circuit Ich data Qch data Data Rayleigh Rayleigh Rayleigh fading channel 2 程序实现程序实现见 QPSK System BER Simulation m 3 仿真波形仿真波形 BER