A free-space optical (FSO) commuication link simulator written in C language

Written by Mojtaba Mansour Abadi

The code is written in C language using Code::Blocks. The code performs a real time simulation by generating psedurandom bit sequence on the fly. The bit sequence is changed into electrical signal which modulates a laser later on. The output of the laser is launched into a free space optical channel where laser output is exposed to propagation, fog/smoke, turbulence, pointing error, and miscellaneous effects. The optical beam then is received by an aperture and then converted to electrical signal using a photo-receiver. Then received bits are extracted and compared to transmit bits in order to measure bit-error-rate (BER) of the system. The turbulence effect is based on Log-Normal model and for fog/smoke, Kim model is utilised.

Code::Blocks ide can be downloaded from here. For GUIs and plots DISLIN a free library is used. DISLIN can be downloaded for both windows and linux from here. To perform FFT operation, GSL an open source library is used. GSL is included in linux and for windows it can be downloaded from here.

• Add the following libraries to the build linker setting: DISLIN Library: "dismg.a" OS Library: "user32", "gdi32", and "opengl32" GSL Library: "gsl folder\lib\libgsl.a", and "gsl folder\lib\libgslcblas.a"
• Add DISLIN header file folder to search directories compiler

• Add the following libraries to the build linker setting: DISLIN Library: "libdislin.so" OS Library: "pthread" GSL Library: "libgsl", and "libgslcblas"
• Add DISLIN header file folder to search directories compiler