The performance of space shift keying for free-space optical communications over turbulent channels

Abaza, Mohamed; Mesleh, Raed; Mansour, Ali; Aggoune, El‐Hadi M.

doi:10.1117/12.2076528

Cited by 19 publications

(13 citation statements)

References 17 publications

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“…Later, we will discuss the mapping technique following the derivation of the ABER in Section III. D. Instantaneous BER We can use the widely accepted union bound technique to find a tight upper bound of BER for OSSK-FSO-MIMO in the form of [9]: (12) where d H (c l1 , c l2 ) is Hamming distance between the transmitted and received symbols c l1 and c l2 , respectively, by counting the number of bits in error. Note, for c l1 = c l2 , Hamming distance is zero.…”

Section: Statistics Of the Correlated γγ At Modelmentioning

confidence: 99%

“…Txs to encode the information bits thereby trading off the receiver's complexity against the data rate. A similar concept was adopted in [9], to develop the doppelganger of SSK for FSO with atmospheric turbulence (AT), termed as optical SSK (OSSK).…”

mentioning

confidence: 99%

“…In [12], it was shown that OSM offers an improved performance than conventional optical modulation methods in terms of power and SE with reduced decoding complexity. In [9], the bit error rate (BER) performances of OSSK under saturated and weak AT regimes are evaluated using negative exponential and lognormal models, respectively.…”

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confidence: 99%

“…In [9]- [14], it was assumed that the channel is uncorrelated, which is not true for practical outdoor FSO-MIMO links with closely spaced multiple apertures. The spatial correlation among different channel gains can be caused due to various reasons such as close proximity of optical Txs and receivers (Rxs), antenna arrangement, angle spread, and angle of arrival (AOA), etc.…”

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confidence: 99%

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Impact of Channel Correlation on Different Performance Metrics of OSSK-Based FSO Systems

Priyadarshani

Jaiswal

Bhatnagar

et al. 2020

IEEE Trans. Wireless Commun.

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In this paper, we study the impact of correlation on the bit error rate (BER) and the channel capacity of a free-space optical (FSO) multiple-input-multiple-output (MIMO) system employing optical space shift keying (OSSK) over a fading channel. In order to study a practical correlated channel, we consider the effect of channel correlation due to both small-and large-scale eddies and show that the use of OSSK over correlated FSO channel can lead to an improved system performance with increasing correlation level of upto 0.9. In this work, we first develop an analytical framework for different performance metrics of the OSSK multiple-input single-output system with correlation and then extend our investigation by proposing an asymptotically accurate mathematical framework for MIMO. We also validate all the analytical results using MATLAB simulations. Finally, we develop an experimental setup of FSO with two correlated links to study the throughput and latency of the links at different turbulence levels.Index Terms-Arbitrary correlation, bit error rate, discreteinput continuous-output (DCMC) capacity, free-space optical (FSO) communications, Gamma-Gamma (ΓΓ) distribution, Green's matrix, MIMO, optical space shift keying I. INTRODUCTIONRecently, spatial modulation (SM) has been proposed as a novel and promising technique for radio-frequency (RF) communications, which offers improved spectral efficiency (SE) and performance at reduced data-processing complexity, compared with other widely adopted multiple-input-multipleoutput (MIMO) schemes [2]- [4]. SM exploits both signal and spatial-constellations for data transfer by encoding a unique sequence of bits for intensity modulation of a single transmitter (Tx)-laser, while the remaining Txs are in the off-state. In [5], optical SM (OSM) was proposed, which provided a simple solution in free-space optical (FSO)-MIMO systems with reduced inter-channel interference (ICI), simpler decoding, and improved inter-antenna synchronization (IAS). Space shift keying (SSK)-a special case of SM for an RF channel and introduced in [6]-[8]-exploits only the spatial positions of A part of this paper was presented at

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Section: Statistics Of the Correlated γγ At Modelmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Impact of Channel Correlation on Different Performance Metrics of OSSK-Based FSO Systems

Priyadarshani

Jaiswal

Bhatnagar

et al. 2020

IEEE Trans. Wireless Commun.

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“…x . To ensure that the fading channel does not attenuate or amplify the average power, the fading coefficients are normalized [15].…”

Section: Log-normal (Ln) Channelsmentioning

confidence: 99%

Relay Selection Schemes for FSO Communications over Turbulent Channels

et al. 2019

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Free Space Optics (FSO) Communication has attracted the attention of the researchers in the last decade due to its high data rate, security, and low cost. Relay-assisted techniques are used to divide the distance to shorter hops in order to mitigate the effects of turbulence, weather attenuation, pointing error, and geometric loss. Choosing an active relay per time slot has been proven to enhance the performance of the system and decrease the loading effect on the system when compared to all active relays. This paper investigates the best relay that can be selected according to the source to relay (S-R) channel coefficient, relay to destination (R-D) channel coefficient, and source to destination (S-D) channel coefficient. A comprehensive comparison is applied to the three following cases: (a) Broadcast phase from source to relay to select the best (Proactive-Relay); (b) Broadcast phase from relay to destination after broadcasting to all relays then select (Reactive-relays); and, (c) Direct link from source-to-best relay-to-destination to conclude which method is better for different scenarios, such as turbulence regime, number of relays, different pointing error effect, and severity of S-R as compared to R-D and vice versa. The selection methods regard to four aspects: (1) Number of relays (two or three relays); (2) Distance between Source-Relay and Relay-Destination (D = 400–600 m, 500–500 m, and 600–400 m); (3) The different turbulence of Log-normal channel and Gamma-Gamma channel (with a refractive index coefficient( C n 2 = 0.5 × 10−14, 2 × 10−14 and 5 × 10−14)); and finally, (4) Beam waist ω z (pointing error).

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