Title :
Hybrid 2-PPM-BPSK-SIM with the spatial diversity for free space optical communications
Author :
Faridzadeh, M. ; Gholami, A. ; Ghassemlooy, Z. ; Rajbhandari, S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Isfahan Univ. of Technol., Isfahan, Iran
Abstract :
In this paper, the effect of the equal gain combining (EGC) spatial diversity for the free space optical (FSO) link for the new hybrid pulse position modulation binary phase shift keying subcarrier intensity modulation (2-PPM-BPSK-SIM) scheme in a turbulence channel is investigated. The analytical unconditional bit error rate (BER) of 2-PPM-BPSK-SIM with the EGC diversity under lognormal and negative exponential channels is investigated and a computer simulation is carried out to quantify the diversity gain. The results are compared with the BPSK-SIM modulation scheme. The results show that the EGC diversity offers a significant optical power gain and 2-PPM-BPSK offers improved performance to BPSK-SIM.
Keywords :
atmospheric turbulence; diversity reception; error statistics; intensity modulation; optical links; optical modulation; phase shift keying; pulse position modulation; binary phase shift keying; bit error rate; equal gain combining spatial diversity; free space optical communications; hybrid 2-PPM-BPSK-SIM; lognormal exponential channel; negative exponential channel; pulse position modulation; subcarrier intensity modulation; turbulence channel; Bit error rate; Gain; Optical fiber communication; Optical receivers; Signal to noise ratio;
Conference_Titel :
Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2012 8th International Symposium on
Conference_Location :
Poznan
Print_ISBN :
978-1-4577-1472-6
DOI :
10.1109/CSNDSP.2012.6292705
