Open AccessAnalytical approach of an FSO Link with alamouti- type STBC considering weak atmospheric turbulence
Author(s) -
Saiful Islam,
Monjur Morshed,
RC Roy,
Mha Begum
Publication year - 2018
Publication title -
bangladesh journal of scientific and industrial research
Language(s) - English
Resource type - Journals
eISSN - 2224-7157
pISSN - 0304-9809
DOI - 10.3329/bjsir.v53i3.38267
Subject(s) - bit error rate , fading , transmitter , keying , space–time block code , diversity combining , maximal ratio combining , coding gain , electronic engineering , antenna diversity , telecommunications , physics , computer science , engineering , decoding methods , channel (broadcasting) , wireless
An analytical approach is proposed to evaluate the bit error rate (BER) performance of a direct detection on-off keying (OOK) free space optical link over log-normal atmospheric turbulence-induced fading channels based on modified Alamouti code presented by Simon and Vilnrotter and maximal ratio combining (MRC) at the receiver. Simulations show that due to coding and diversity at the receiver, a significant improvement in the BER performance is obtained at a given BER. For diversity order of 2 in both transmitter and in receiver, the amount of BER improvement is 6.6dB at BER 10-5. Further increment of the receiver diversity from 2 to 4 gives additional 3dB improvement at the same BER. A drastic improvement of the BER performance is also possible for increasing number of receiver diversity which may increase hardware complexity. Simulation results are demonstrated to confirm the analytical results.Bangladesh J. Sci. Ind. Res.53(3), 205-210, 2018