OFDM SIMULATION in MATLAB

【实例简介】OFDM SIMULATION in MATLAB 

【核心代码】

Table of Contents
List of Figures and Tables ................................................................................................................. iii
Chapter 1 – INTRODUCTION..............................................................................................................1
Chapter 2 – BACKGROUND................................................................................................................3
2.1 – OFDM Basics............................................................................................................................... 3
2.2 – Overview of This OFDM Simulation Project............................................................................... 6
Chapter 3 – DESIGN and IMPLEMENTATION......................................................................................8
3.1 – Overview.................................................................................................................................... 8
3.2 – System Configurations and Parameters................................................................................... 10
3.3 – Input and Output...................................................................................................................... 11
3.4 – OFDM Transmitter ................................................................................................................... 13
3.4.1 – Frame Guards ................................................................................................................... 13
3.4.2 – OFDM Modulator.............................................................................................................. 14
3.5 – Communication Channel.......................................................................................................... 17
3.6 – OFDM Receiver ........................................................................................................................ 18
3.6.1 – Frame detector................................................................................................................. 18
3.6.2 – Demodulation Status Indicator......................................................................................... 18
3.6.3 – OFDM Demodulator.......................................................................................................... 19
3.7 – Error Calculations..................................................................................................................... 21
3.8 – Plotting..................................................................................................................................... 23
Chapter 4 – TEST RESULTS...............................................................................................................25
Chapter 5 – CONCLUSION................................................................................................................34
Bibliography....................................................................................................................................35
Appendix A – Glossary and Acronyms.............................................................................................36
Appendix B – A Trial of this OFDM MATLAB Simulation..................................................................37
B.1 – Screen Log................................................................................................................................ 37
B.2 – Input and Output Images......................................................................................................... 38
B.3 – Transmitter Plots...................................................................................................................... 39
B.4 – Receiver Plots........................................................................................................................... 40
Appendix C – Complete Source Codes for this Project.....................................................................41
C.1 – Main Program File (OFDM_SIM.m).......................................................................................... 41
C.2 – System Configuration Script File (ofdm_parameters.m) ......................................................... 47
C.3 – Data Word/Symbol Size Conversion Function File (ofdm_base_convert.m)........................... 49
C.4 – Modulation Function File (ofdm_modulate.m) ....................................................................... 50
C.5 – Frame Detection Function File (ofdm_frame_detect.m)......................................................... 53
C.6 – Demodulation Function File (ofdm_demod.m) ....................................................................... 54
iii
List of Figures and Tables
List of Figures
Figure 1 – Cyclic Extension Tolerance ..................................................................................................... 1
Figure 2 – Effectiveness of the Cyclic Extension...................................................................................... 1
Figure 3 – Block Diagram of an OFDM System........................................................................................ 1
Figure 4 – OFDM carriers allocated to IFFT bins...................................................................................... 1
Figure 5 – Modulated Signal (single frame)............................................................................................. 1
Figure 6 – Modulated Signal (multiple frames)....................................................................................... 1
Figure 7 – data_tx_matrix ....................................................................................................................... 1
Figure 8 – Differentiated matrix.............................................................................................................. 1
Figure 9 – pre-IFFT matrix ....................................................................................................................... 1
Figure 10 – Modulated Matrix................................................................................................................. 1
Figure 11 – Time Guard Removal............................................................................................................ 1
Figure 12 – Received Data Extracted from FFT bins................................................................................ 1
Figure 13 – Differential Demodulation.................................................................................................... 1
Figure 14 – Program Runtime ................................................................................................................. 1
Figure 15 – BER vs M-PSK........................................................................................................................ 1
Figure 16 – BER vs SNR............................................................................................................................ 1
Figure 17 – Pixel Error vs SNR.................................................................................................................. 1
Figure 18 – Original Image....................................................................................................................... 1
Figure 19 - Received Images using BPSK ................................................................................................. 1
Figure 20 – Received Images using QPSK................................................................................................ 1
Figure 21 – Received Images using 16-PSK.............................................................................................. 1
Figure 22 – Received Images using 256-PSK............................................................................................ 1
Figure 23 – OFDM Received Image ......................................................................................................... 1
Figure 24 – Original Image....................................................................................................................... 1
Figure 25 – OFDM Transmitter Plots....................................................................................................... 1
Figure 26 – OFDM Receiver Plots............................................................................................................ 1
List of Tables
Table 1 – User Input Validity Protection ................................................................................................. 1
Table 2 – OFDM Transmission Summary................................................................................................. 1
Table 3 – Error Calculations..................................................................................................................... 1
Table 4 – Parameters of Simulation in Appendix B............................................................................... 25
Table 5 – Parameters for BER/SNR Analysis............................................................................................ 1
Table 6 – OFDM Simulation Log.............................................................................................................. 1