By M. Khatib
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We found that for the same 32 m Tx-Rx distance, the received signal power was similar for both positions Tx1-Rx1 and Tx2-Rx2. 8*10-5 for Tx1-Rx1 and Tx2Rx2 positions, respectively. In the case of Tx1-Rx1 position, diffractions and reflections from the borders of the opening door can be the dominant contributors to the significant BER degradation. BER measurements versus Tx-Rx distance using 64 bits preamble (γ = 58) were also carried out (in the case of Rx2 position). We found that for a Tx-Rx2 distance less than 32 m, all transmitted bits are received without errors (with RS coding) during 5 minutes measurement.
Sagias, N. & Tombras, G. (2007). On the cascaded weibull fading channel model, Journal of the Franklin Institute 344(1): 1–11. , Karagiannidis, G. & Tombras, G. (2004). Channel capacity and second-order statistics in Weibull fading, IEEE Communications Letters 8(6): 377–379. Sandalidis, H. G. & Tsiftsis, T. A. (2008). Outage probability and ergodic capacity of free-space optical links over strong turbulence, Electronics Letters 44(1): 46–47. Shaft, P. D. (1974). On the relationship between scintillation index and Rician fading, IEEE Transactions on Communications 22: 731–732.
As shown in Fig. 23, for the same BER = 10-6, the Tx-Rx distance is around 27 m without channel coding and around 36 m with RS coding. This result proves the RS coding efficiency. Compared to the result in Fig. 21, a good agreement of a Tx-Rx maximum distance was obtained. This means that the multipath components are greatly reduced by the spatial filtering of the horn antennas (pencil beam). 42 Advanced Trends in Wireless Communications However, the main problem of using directional antennas is the human obstruction.