通信系统建模与仿真(别人的借鉴下).docVIP

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 discussions, 1.system diagram; 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 徐亚冲（通信与信息系统）学号一、QPSK载波调制 结构框图 发送端 接收端 程序实现见QPSKmodelmain.m 仿真波形 系统基带波形和功率谱 系统调制后的波形和功率谱 系统通过AWGN信道的波形和功率谱 系统通过瑞丽信道前后的星座图 误码率仿真 结构图 AWGN channel Rayleigh fading channel 程序实现见QPSK_System_BER_Simulation.m 仿真波形 BER performance of QPSK transmission scheme under AWGN and Rayleigh fading environments a2 Binary Data Senquence Si(t) Demultiplexer Non-Reture- To-Zero Llevel Encoder In-Phase Channel Quadrature Channel Threshold=0 y2 Decision Device y Threshold=0 Decision Device Mutiplexer Output Data Qch data Ich data Demapping circuit Decision circuit AWGN Decision circuit AWGN Data generator Mapping circuit Rayleigh Rayleigh Data Qch data Ich data Demapping circuit Decision circuit AWGN Decision circuit AWGN Data generator Mapping circuit