Free space optical communication using subcarrier intensity modulation through generalized turbulence channel with pointing error

Abstract

Free Space Optical (FSO) Communication Systems are wireless systems capable of providing high speed, secure and cost effective communication between two entities. The channel for FSO is expressed in terms of the Malaga-distribution model. It is a generalized channel model encompassing all the channel conditions and previous models. In this work, the performance of a Subcarrier Intensity Modulation FSO system is analyzed by considering the ill effects channel turbulence and pointing error and derived a closed form analytical expression for bit error rate and channel capacity. The results demonstrate the performance deterioration the system suffers because of the channel and also how the m-distribution model can be used to obtain the performance over other FSO channels.

A novel multi‐quality of service system design: Integration of hybrid free space optical/RF, cognitive hybrid and free space optical links

“…It can be seen from Table 1 that for fixed SNR, S o ¼ 12 dB, and for desired Out avg N,n ¼ 0:45 many system dimensions are possible for all the three cases of channel conditions. However, the largest possible system size for weak turbulence and strong turbulence with pointing errors are (11,11) and (3,3) respectively. By comparing the largest system dimensions for all channel conditions, for any desired Out avg N,n , it can be observed that the system dimension decreases as the channel impairments increase.…”

“…Thus, the proposed multi-QoS system as shown in Figure 1C and S H r < ϕ r , then the hybrid link is said to be in outage. 3 For all the times when S H o > ϕ o , data is transmitted via the FSO link and the RF spectrum remains idle. These idle periods of RF H have been termed as "FSO dependent temporal holes" 11 and are shown in Figure 1B.…”

“…The vulnerability of optical signals to inherent channel degradations caused by atmospheric turbulence, 1,2 weather phenomenon as well as pointing error 3 between optical transreceivers hamper the carrier-class 99.999% availability. A suitable and practical approach for extending the link availability of free space optical (FSO) involve use of an RF link as a backup and such systems are commonly known as hybrid FSO/RF systems.…”

A MPR optimization algorithm for FSO communication system with star topology

“…Some of them [2][3][4] investigated fading mitigation techniques to combat the degrading effects of atmospheric turbulence. Others [5][6][7][8] analysed the bit error rate (BER) performance and capacity performance of the FSO system with different modulation technologies by considering the ill effects channel turbulence and pointing error. The FSO communication system with the star topology is considered to have the widest range of application in the future, however, there are few references focus on the problems in the star topology.…”

Relay selection in mixed RF/FSO system over generalized channel fading

“…On the other hand, free space optical (FSO) communication system is a line-of-sight (LOS) technology having various benefits like cheap and easy installation, license free spectrum and high-data rate transmission and many more. However, for longer transmission distance, the atmospheric turbulence induced fading significantly deteriorates the system performance [3]. Considering the aforementioned merits and demerits of RF and FSO systems, the FSO system is used to complement the RF system as mixed RF/FSO system, which provides high data rate transmission and also supports long distance transmission.…”