Turbo codes: principles and applications
Turbo codes: principles and applications
Free Space Optics: Enabling Optical Connectivity in Today's Networks
Free Space Optics: Enabling Optical Connectivity in Today's Networks
Coding for MIMO Communication Systems
Coding for MIMO Communication Systems
Optical wireless links with spatial diversity over strong atmospheric turbulence channels
IEEE Transactions on Wireless Communications
Error performance of coded FSO links in turbulent atmosphere modeled by gamma-gamma distributions
IEEE Transactions on Wireless Communications
RoFSO: a universal platform for convergence of fiber and free-space optical communication networks
IEEE Communications Magazine
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
UKSIM '10 Proceedings of the 2010 12th International Conference on Computer Modelling and Simulation
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
CICN '10 Proceedings of the 2010 International Conference on Computational Intelligence and Communication Networks
Urban optical wireless communication networks: the main challenges and possible solutions
IEEE Communications Magazine
IEEE Journal on Selected Areas in Communications
Part 1: optical communication over the clear turbulent atmospheric channel using diversity
IEEE Journal on Selected Areas in Communications
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This paper demonstrates an analytical approach on the bit error rate (BER) performance evaluation of a multi- carrier code division multiple access (MC-CDMA) communication link operating over terrestrial free space optical (FSO) channel considering effect of atmospheric turbulence The turbulence induced intensity fading is statistically modeled by Gamma-Gamma PDF (probability density function). Bit error rate performance improvement is proposed using photo detector spatial diversity with Equal Gain Combining (EGC) and Turbo Coding. Analysis is carried out with different bandwidth efficient phase shift keying (PSK) based sub-carrier intensity modulation (SIM) with direct detection. Numerical simulation results of proposed analytical model indicate that, sub-carrier intensity modulation scheme; number of receiver photo detectors, turbo coding parameter and link length should be optimally engineered for ensuring system reliability. It can be inferred from the simulation that, a reliable communication link (10-10 BER) can be established over a link length of 4 Kmin strong turbulence fading condition using an array of 4 PIN photo detectors, 8-ary PSK based sub-carrier intensity modulation scheme and appropriate turbo coding parameter with an average 10.2 dB CINR (Carrier to Interference and Noise Ratio) requirement per photo detector. Besides, more than 130 dB average CINR gain is also confirmed from BPSK modulated, un-coded SISO (single input-single output) system for maintaining targeted BER (10-10) in presence of strong turbulence fading.