Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes

Table 1

Simulation parameters.

Parameter	Symbol	Value
Wavelength		1550 nm
Distance between source and destination		10 km
Distance between source and relay		9.5 km
Length of the QC-LDPC code word		1086
Information bits		543
Frozen bits		543
Variance is greater than 1 in the case of the gamma-gamma model		>1
Transmit power of the source		1
Transmit power of the relay		1
PPM (Pulse Position Modulation) modulator
BPSK (Binary Phase Shift Keying) modulator

The decoding results are compared to the source sequence and calculate the BER (Bit Error Rate) which is the number of error bits divided by the total number of bits transmitted.