Performance of mixed RF/FSO systems in exponentiated Weibull distributed channels

Zhao, Jing; Zhao, Shanghong; Zhao, Weihu; Liu, Yun; Li, Xuan

doi:10.1016/j.optcom.2017.07.015

Cited by 31 publications

(16 citation statements)

References 17 publications

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“…, where C is a constant associated with G [26]. The CDF of the hybrid RF-FSO system is defined as [9]:…”

Section: System and Channel Modelmentioning

confidence: 99%

“…Such as Nakagami-m/ Gamma-Gamma distribution [4], Rayleigh distribution and M-distributed distribution [5], κ − µ/η − µ distribution and Gamma-Gamma distribution [6], and the Nakagami-m/Exponentiated Weibull (EW) distribution [7]. However, many studies adopted Rayleigh/Gamma-Gamma distribution [8][9][10], because the Gamma-Gamma distribution has a good simulation for the atmospheric turbulence from weak to strong of the FSO link, and Rayleigh distribution is close to the condition of the RF channel. As a result, we adopted Rayleigh distribution for the RF link and Gamma-Gamma distribution for the FSO link.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

Jiang¹,

Zhao²,

Liu

et al. 2019

Applied Sciences

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The improvement for hybrid radio frequency–free space optical (RF–FSO) communication system in wireless optical communications has acquired growing interests in recent years, but rarely improvement is based on hybrid modulation. Therefore, we conduct a research on end-to-end mixed RF–FSO system with the hybrid pulse position modulation–binary phase shift keying–subcarrier intensity modulation (PPM–BPSK–SIM) scheme. The RF link obeys Rayleigh distribution and the FSO link experiences Gamma–Gamma distribution. The average bit error rate (BER) for various PPM–BPSK–SIM schemes has been derived with consideration of atmospheric turbulence influence and pointing error condition. The outage probability and the average channel capacity of the system are discussed as well. Simulation results indicate that the pointing error aggravates the influence of atmospheric turbulence on the channel capacity, and the RF–FSO systematic performance is improved obviously while adopting PPM–BPSK–SIM under strong turbulence and severe pointing error conditions, especially, when the system average symbol length is greater than eight.

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“…, where C is a constant associated with G [26]. The CDF of the hybrid RF-FSO system is defined as [9]:…”

Section: System and Channel Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

Jiang¹,

Zhao²,

Liu

et al. 2019

Applied Sciences

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show abstract

“…A number of research works have investigated the hybrid RF/FSO system with the variablegain dual-hop AF relay system [13], [14], [15]. In [13], the outage probability (OP) and the average bit error rate (BER) performance of the hybrid RF/FSO system with the fixed-gain AF relay and CSI-assisted AF relay schemes were investigated. In [14], a hybrid RF/FSO system with a variablegain dual-hop AF relay scheme was proposed and its OP performance investigated.…”

Section: Introductionmentioning

confidence: 99%

On the performance of a mixed RF/MIMO FSO variable gain dual-hop transmission system

Han

Jiang

You

et al. 2018

Optics Communications

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In this work, we propose a mixed radio frequency (RF) and multiple-input-multiple-output (MIMO) free-space optical (FSO) system based on a variable-gain dual-hop relay transmission scheme. The RF channel is modeled by Rayleigh distribution and Gamma-Gamma turbulence distribution is adopted for the MIMO FSO link, which accounts for the equal gain combining diversity technique. Moreover, new closed-form mathematical formulas are obtained including the cumulative distribution function, probability density function, moment generating function, and moments of equivalent signal-to-noise ratio of the dual-hop relay system based on Meijer's G function. As such, we derive the novel analytical expressions of the outage probability, the higher-order fading, and the average bit error rate for a range of modulations in terms of Meijer's G function. Furthermore, the exact closed-form formula of the ergodic capacity is derived based on the bivariate Meijer's G function. The evaluation and simulation are provided for system performance, and the effect of spatial diversity technique is discussed as well.

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“…Approaches to widen the applicability and improve the performance of FSO links have been taken in the following directions: adjusting signal intensity by increasing its power in case there are adverse weather conditions [1,2], studying and finding ways to increase the transmission angle so that reception is less of a problem, using systems with multiple receivers and multiple transmitters (MIMO) [3,4], and using hybrid FSO and RF links [1,[5][6][7][8][9] and combinations of two or more of these approaches. Also, multiple recent studies address the performance mixed RF/FSO systems where RF and FSO links are used to bridge separate parts of the transmission path, for example, [10][11][12][13].…”

Section: Introduction and Related Workmentioning

confidence: 99%

Availability of a Hybrid FSO/RF Link While Using the Link’s Diversity for Packet Scheduling

Grigoriu

2018

Wireless Communications and Mobile Computing

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Hybrid-free space optical and radio frequency wireless links are a way of providing reliable transport of real-time traffic in outdoor wireless environments. We consider a link layer protocol that assigns packets to each physical channel of such a hybrid link, which first attempts to send each packet over one of the links (the main link) and, if unsuccessful, sends the packet over the other link (the backup link). The hybrid link processes high-priority traffic by using the link layer protocol and additional (background) traffic at low priority over the backup link. In this setting, high-priority traffic can be transmitted at a rate as high as the maximum capacity of the main link, assuming that the backup link can compensate for main link capacity deterioration, with no need for reconfigurations aimed at adapting to changes in weather conditions, which is an advantage over other approaches. From the perspective of link availability for high-priority traffic, we compare our approach to using another protocol that does not require reconfigurations, which could be employed if the backup link is expected to have a constant transmission rate during the time interval of interest. For situations where both links can be represented by finite-state Markov models with states corresponding to channel bit error rates, as has been done in previous literature for radio frequency links and for free space optical links affected by strong atmospheric turbulence and Gaussian noise, we give a way to provide probabilistic quality of service guarantees for background traffic assuming that the high-priority traffic is insured to not exceed a given constant rate.

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Performance of mixed RF/FSO systems in exponentiated Weibull distributed channels

Cited by 31 publications

References 17 publications

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

On the performance of a mixed RF/MIMO FSO variable gain dual-hop transmission system

Availability of a Hybrid FSO/RF Link While Using the Link’s Diversity for Packet Scheduling

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