Impact of Atmospheric Turbulence, Pointing Error, and Traffic Pattern on the Performance of Cognitive Hybrid FSO/RF System

Nath, Soyinka; Sengar, Sujata; Shrivastava, Shreesh Kumar; Singh, Shree Prakash

doi:10.1109/tccn.2019.2952116

Cited by 17 publications

(25 citation statements)

References 25 publications

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“…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.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…For all the times when

S_{o}^{H} > 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. Thus, the usage of

{RF}_{H}

in the hybrid link depends on

{FSO}_{H}

channel conditions.…”

Section: Proposed System Model and Design Methodologymentioning

confidence: 99%

“…In Reference 10, users of a secondary cognitive multicast network share the spectrum of a primary multicast network, with a limitation on the number of secondary users that may be supported for a given secondary transmission failure target. The authors of Reference 11 have implemented interweave cognitive radio and studied different data traffic conditions to reveal the existence of “FSO dependent” and “traffic dependent” temporal holes in the RF spectrum of a hybrid FSO/RF link. When data transmission in a hard switched hybrid link takes place via the FSO link, the RF spectrum remains idle, resulting in “temporal holes.” Utilization of these temporal holes by solitary FSOs for backup purposes results in formation of cognitive hybrid FSO/RF link, which significantly improves link availability of the solitary FSOs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Nath

Singh

Sengar

2021

Micro & Optical Tech Letters

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The proposed system design presents a novel configuration that is created by the integration of several standalone free space optical (FSO) links, a hybrid FSO/RF and some cognitive or pseudo hybrid links. The objective is to allow different quality-of-service (QoS) links within a system as a whole. In addition to individual QoS requirements, a constraint on the overall system QoS, in the form of minimum system outage, is also ensured. The design methodology aims at identifying the optimal number of standalone FSOs and cognitive hybrid links which can be supported by a single hybrid FSO/RF link. Atmospheric turbulence and pointing errors are considered for the analysis. Simulation results are used to corroborate the analytical findings.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

“…For all the times when

S_{o}^{H} > 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. Thus, the usage of

{RF}_{H}

in the hybrid link depends on

{FSO}_{H}

channel conditions.…”

Section: Proposed System Model and Design Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Nath

Singh

Sengar

2021

Micro & Optical Tech Letters

Self Cite

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show abstract

“…represents the channel estimation error vector, and ρ 1 ∈ [0, 1] is the correlation coefficient between h i AR and h i AR , which is an N R × 1 channel link vector between the i-th transmit antenna at Alice and Relay with zero mean and variance λ AR . The index of i is formulated as i = arg max 1≤i≤NA h i AR 2 . The larger ρ 1 yields better channel estimation accuracy, and ρ 1 = 1 means that the source obtains the perfect CSI of legitimate channel.…”

Section: In the Alice→relay Linkmentioning

confidence: 99%

Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Shang¹,

Zhang²,

Wu³

et al. 2020

Preprint

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In this paper, we investigate the effects of the outdated channel state information (CSI) on the secrecy performance of an underlay spectrum sharing cognitive radio networks (CRNs) with full-duplex (FD) receivers. Legitimate destination node (Bob) acts as a FD node, transmitting interference signals to a passive eavesdropping node (Eve) while receiving signals. To exploit the benefits of collaborative zero-forcing beamforming and FD technologies, transmit antenna selection-maximal-ratio combining-zero forcing beamforming/maximal-ratio transmission-selection combining-zero forcing beamforming (TAS-MRC-ZFB/MRT-SC-ZFB) scheme is considered at the secondary user transmission link with the outdated CSI and collaborative ZFB is adopted at FD destination node, which tries to improve the transmission efficiency of our considered CRNs. Specifically, in order to evaluate the proposed scheme, the derivation of analytical expression in exact and the high asymptotic closed-form expressions of secrecy outage probability (SOP) are provided of the considered network with and without feedback delay of the CSI. Furthermore, the impact of delay on the second user transmission and interference links of the primary user (PU) node is investigated. The results reveal that outdated CSI of secondary user transmission and collaborative ZFB channels deteriorates the SOP, and the outdated CSI between PU and SU will affect the power margin factors for the secondary transmitter. Furthermore, we also study the effects of different system parameters on the secrecy diversity order and secrecy array gain. The proposed scheme is compared with the existing TAS-MRC/TAS-MRC scheme to verify the improvement of system performance. Finally, Monte Carlo simulations verify the correctness of our theoretical analysis.

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“…To overcome the misalignment issues, optical beams with large radius can be exploited but at the price of reduced power levels or increased error rate at the receiver and less link security. Therefore, it is claimed to perform the beam width optimization in order to achieve best error rate and geometric signal losses [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Optical-Radio Transmission System Link Quality: Link Budget Analysis

2020

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From the last few decades' radio frequency (RF) spectrum remained attractive for wireless/wire-line applications. RF spectrum becomes dense and occupied, which makes its availability difficult to other broadband channels. Free space optical (FSO) communication, which was used for messaging/indication in the ancient days, now becomes more popular and attractive in the new era. The popularity of FSO is due to its freely available large spectrum, inherited secure links and ease of deployment. However, FSO link has to face certain challenges, e.g., line-of-sight (LOS) requirement, link attenuation due to atmospheric turbulence and severe weather conditions. To overcome the issues of FSO communication, hybrid optical-radio transmission system is proposed by which we can get maximum benefits of both spectrum. Considering the proposed transmission system link quality, link budget analysis is done in the presented work. Link budget design of transmission system is important to analyze and give recommendations. INDEX TERMS Free space communication (FSO), link budget analysis (LBA), radio frequency (RF), signal dependent Gaussian noise (SDGN), signal independent Gaussian noise (SIGN).

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Impact of Atmospheric Turbulence, Pointing Error, and Traffic Pattern on the Performance of Cognitive Hybrid FSO/RF System

Cited by 17 publications

References 25 publications

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

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

Secure Transmission in Cognitive Radio Networks using Full-duplex Technique with Outdated CSI

Hybrid Optical-Radio Transmission System Link Quality: Link Budget Analysis

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