Anisotropy effect on performance of subcarrier intensity modulated binary phase shift keying optical wireless communication links in weakly turbulent underwater channel

This paper has presented high modulated soliton power transmission interaction with optical fiber and optical wireless communication channels at flow rate of 40 Gbps and 20 km link range. The proposed modulation schemes are continuous phase frequency shift keying (CPFSK), Quadrature amplitude modulation (QAM), differential phase shift keying (DPSK), frequency shift keying (FSK), pulse amplitude modulation (PAM), minimum shift keying (MSK), and optical quadrature phase shift keying (OQPSK). CPFSK has presented better performance than other proposed modulation schemes for both optical fiber and optical wireless communication channels. The enhancement of optical signal/noise ratio at fiber/wireless channel, received electrical power and signal/noise ratio at optical receiver with increase of bits per symbol for different proposed modulation schemes except for CPFSK scheme. Therefore it is evident that CPFSK modulation scheme is more efficient and better performance than other modulation schemes for different communication channels. The obtained results are simulated with optisystem program version 13.

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Performance Enhancement of DS-CDMA System using Extended BPSK Modulation Scheme

Journal on Today s Ideas-Tomorrow s Technologies ◽

10.15415/jotitt.2016.42009 ◽

2016 ◽

Vol 4 (2) ◽

pp. 172-180

Author(s):

Barkha Pandey ◽

Raghu Harsh Kalia ◽

Monica Kaushik ◽

Monika Arora

Keyword(s):

Phase Shift ◽

Wireless Communication ◽

Spectrum Efficiency ◽

Modulation Scheme ◽

Cdma System ◽

Phase Shift Keying ◽

Binary Phase ◽

Modulation Format ◽

Shift Keying ◽

Binary Phase Shift Keying

In a last few decades there has been tremendous growth and a drastic rise in wireless communication technologies. The major issue that the world is facing today with the advent of so many sophisticated wireless communication devices is efficient utilization of the spectrum. Spectrum efficiency comes together with a tradeoff factor of energy consumption. Thus, the need of the hour is an energy and bandwidth efficient technique. DS-CDMA is one of the competitive and most investigated technique in wireless communication which caters the large demand at the same time with limited bandwidth. Existing modulation techniques does not promise to provide better performance in case of higher noise. Therefore, one looks for a better BER stipulated modulation format to improve and enhance the performance of the system. This article revisits conventional Binary phase shift keying method and compares its performance in terms of BER with a special Extended Binary Phase Shift Keying (EBPSK) modulation format for a DS- CDMA system. EBPSK scheme is flexible and simple which is easily integrated in a network and assures improved and enhanced performance.

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Performance Evaluation of OWC Using Different Modulation Techniques

Journal of Optical Communications ◽

10.1515/joc-2015-0103 ◽

2016 ◽

Vol 37 (4) ◽

Author(s):

Heena Goyal ◽

Jyoti Saxena ◽

Sanjeev Dewra

Keyword(s):

Performance Evaluation ◽

Phase Shift ◽

Bit Error Rate ◽

Q Factor ◽

Optical Wireless Communication ◽

Phase Shift Keying ◽

Optical Wireless ◽

Transmission Distance ◽

Modulation Techniques ◽

Shift Keying

AbstractIn this paper, performance of an optical wireless communication (OWC) channel has been investigated using different modulation techniques such as phase shift keying (PSK), differential PSK (DPSK) and optical quadrature PSK (OQPSK). This investigation has been compared at a bit rate of 20 Gbps. The results are evaluated in terms of quality (Q) factor and bit error rate (BER) using different modulation techniques. It is observed that by using PSK modulation technique, the signal can travel up to 70 km transmission distance with acceptable BER of 3.48×10

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