BPSK-SIM- PPM modulation for free space optical communications

Faridzadeh, M.; Ghassemlooy, Zabih; Gatri, A.

doi:10.1109/istel.2014.7000811

Cited by 7 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, for L-ary pulse position modulation (LPPM), one data symbol consists of L time slots, only one time slot is valid and the rest are zero, that is, L is the average length of the symbol [28,31]. According to Equations (2) and (8) in reference [11], the definite relationship of the conditional BERs between LPPM and L-ary pulse position modulation-binary phase shift keying-subcarrier intensity modulation (LPPM-BPSK-SIM) can be derived. Utilizing…”

Section: Average Bit Error Ratementioning

confidence: 99%

“…On the other hand, many previous researchers have focused on using different modulations to improve the mixed RF-FSO systematic performance for the modulation has a direct relationship with bit error rate (BER), which is a significant indicator to evaluate system performance. In reference [11,12], various pulse position modulation (PPM), binary phase shift keying (BPSK), and hybrid pulse position modulation-binary phase shift keying-subcarrier intensity modulation (PPM-BPSK-SIM) schemes have been analyzed on the performance over FSO link, the conclusion is that hybrid PPM-BPSK-SIM outperformed BPSK in single FSO link. In literature about the hybrid RF-FSO system [13,14], most of them adopted various binary modulation when it refers to the average bit error rate, BPSK is the most discussed as the binary modulation for it has the lowest bit error rate.…”

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

View full text Add to dashboard Cite

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.

show abstract

Section: Average Bit Error Ratementioning

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

View full text Add to dashboard Cite

show abstract

“…Based on previous studies, BPSK is widely used in FSO links as a low BER binary modulation, but little research has been done on the improvement of high-order modulation and hybrid subcarrier intensity modulation for communication systems, let alone that the receiver aperture is considered. Based on this, we studied the performance of the EW model using various hybrid PPM-BPSK-SIM modulation [31][32][33], atmospheric turbulence with pointing errors is taken into account. We derived the unconditional BER of various PPM-BPSK-SIM when intensity modulation/direct detection (IM/DD) is employed at the receiver [34], meanwhile closed solution of the outage probability and average channel capacity are also obtained, and simulation analysis shows that the adoption of hybrid subcarrier intensity modulation undoubtedly improve the FSO link transmission in wireless sensor networks [35].…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement for Wireless Sensors Networks by Adopting Hybrid Subcarrier Intensity Modulation Over Exponentiated Weibull Turbulence Channels

Hao

Liu

et al. 2020

IEEE Access

View full text Add to dashboard Cite

We conduct a research on free space optical (FSO) communication system that is applied for transmission in wireless sensor networks (WSN), which is based on the hybrid pulse position modulationbinary phase shift keying-subcarrier intensity modulation (PPM-BPSK-SIM) undergoes novel Exponentiated Weibull fading channels. When battery-charged sensor transmission nodes with limited energy is transmitted, it is vital to study the performance of the transmission link. We have derived the exact joint probability function of the transmission link when the atmospheric turbulence and pointing errors are considering. On the basis of them, the unconditional average bit error rate (BER) for hybrid PPM-BPSK-SIM is derived, then the closed expression of the outage probability and the average channel capacity are also derived. Research results indicates that increasing the receiver aperture by aperture averaging effect can distinctly improve the performance of the link. Additionally, for any circumstances of atmospheric turbulence and pointing errors, by combining the utilization of hybrid PPM-BPSK-SIM modulation and symbol with average length greater than eight, the average BER performance can be conspicuously enhanced. The outage probability and average channel capacity of the FSO link are jointly affected by atmospheric turbulence and pointing error, and optimization strategies in different scenarios are given by our research.

show abstract

“…Both classical and quantum receivers for hybrid binary phase shift keying and binary pulse position modulation (BPSK-2PPM) scheme have been investigated and their performances have been compared to each other [4]. Another hybrid modulation scheme, which combines both PPM and binary phase shift keying subcarrier intensity modulation (BPSK-SIM) has been proposed [5]. This scheme offers BER performance that is superior to that of both BPSK-SIM and PPM at the same average transmitted power and bit rate.…”

Section: Introductionmentioning

confidence: 99%

Enhancing BPSK and OOK modulations using hybrid 2BPSK-OOK technique for optical fiber communications systems

Selmy

Ismail

Shalaby

2014

2014 16th International Conference on Transparent Optical Networks (ICTON)

View full text Add to dashboard Cite

A hybrid 2 slots binary phase shift keying-on off keying (hybrid 2BPSK-OOK) scheme is proposed as a new modulation technique to improve the performance of both conventional binary phase shift keying (BPSK) and on-off (OOK) modulation techniques in optical fiber communications systems. In conventional BPSK scheme, a consecutive stream of low power BPSK symbols are transmitted, while in the proposed scheme, a less number of high power BPSK symbols are transmitted in a two slot hybrid frame and their positions are exploited to transmit more bits. That is, the transmitted information is carried in both the positions and phases of the transmitted pulses. The transmission characteristics, transmitter and receiver block diagram, bandwidthutilization, and optimal decoding for the proposed scheme are all studied in this paper. An upper bound on the bit-error rate is obtained for the proposed scheme and is compared to that of the traditional schemes under the same energy per bit constraint. Our results reveal that, for both moderate and high signal-to-noise ratios, the proposed hybrid scheme achieves much lower levels of bit-error rates than that of ordinary coherent-and directdetected OOK schemes. However, at all energy per bit levels, the proposed scheme achieves less performance than that of ordinary BPSK. In addition, the proposed modulation scheme achieves much higher bandwidthutilization efficiencies as compared to that of ordinary schemes.

show abstract

BPSK-SIM- PPM modulation for free space optical communications

Cited by 7 publications

References 11 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

Performance Improvement for Wireless Sensors Networks by Adopting Hybrid Subcarrier Intensity Modulation Over Exponentiated Weibull Turbulence Channels

Enhancing BPSK and OOK modulations using hybrid 2BPSK-OOK technique for optical fiber communications systems

Contact Info

Product

Resources

About