Abstract
The hybrid system of free space optic (FSO) and radio frequency (RF) has come forth as alternative good solution for increasing demand for high data rates in wireless communication networks. In this paper, wireless networks with hard-switching between FSO and RF link are analyzed, assuming that at a certain time point either one of the two links are active, with FSO link having higher priority. As the signal-to-noise ratio (SNR) of FSO link falls below a certain selected threshold, the RF link is activated. In this work, it is assumed that the FSO link follows Gamma-Gamma fading due to the atmospheric turbulence effect whereas RF link experiences Rayleigh fading. To analyze the proposed hybrid model, analytical expressions are derived for the outage probability, bit error rate and ergodic capacity. A numerical comparison is also done between the performances of the proposed hybrid FSO/RF model and the single FSO model.
Highlights
Over the last two decades, we have seen the spread of wireless communication system over the entire globe
It is assumed that RF link is always available and so the system never goes into complete outage
The pink and blue curves are for hybrid free space optic (FSO)/RF system for which average signal-to-noise ratio (SNR) of RF link is kept constant at 5 dB
Summary
Over the last two decades, we have seen the spread of wireless communication system over the entire globe. The reason behind significant attenuation of FSO link due to scattering is the size of fog particle, which is comparable to the operating wavelength of the optical signal. Concept of receiver diversity is proposed in which the receiver takes the copies of the data and combines it to recover the originally transmitted signal These copies are taken from parallel working FSO and RF link simultaneously. The receiver retrieved the original data out of two links by using a maximal ratio combining (MRC) technique Another relay scheme was proposed in [7,8], where the relay system was analyzed for two nodes with the dual hop between. A hybrid FSO/RF system is proposed to increase both the reliability and availability of the network This system is analyzed assuming that FSO follows Gamma-Gamma fading whereas RF link follows Rayleigh fading.
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