Analysis of Raised Cosine Filtering in Communication Systems

Sharma, Om P.; Janyani, Vijay; Sancheti, S.

doi:10.1109/wcsn.2007.4475737

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…where 𝛤𝛤( * ) -Gamma function, 𝐾𝐾 𝑣𝑣 ( * ) is the fifth-order modified Bessel function [25], 𝛼𝛼, and 𝛼𝛼 are both calculated using the following formulas based on weather conditions. [26,27],…”

Section: Fso Channel Modelmentioning

confidence: 99%

Investigation of PSK/Qam Modulated Hybrid Fiber Optic and Free Space Optic System Under Various Atmospheric Losses

Kumar

Kumar²,

Singh³

2023

AEJ

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This research aims to investigate how effectively digital modulation performs to transfer data via hybrid fiber optic and free space optic (FO-FSO) channels for last-mile communication systems. Digital modulation techniques investigated are phase-shift keying (PSK) 8-PSK, 16-PSK, quadrature amplitude modulation (QAM) 4-QAM, 16-QAM, and 64-QAM. FSO is line-of-sight technology being a solution to a last-mile communication system for the challenge of fiber optic cables installation. Combining FSO with fiber optic technology avoids bending losses and the implementation challenges of fiber optic cables in metropolitan areas and between buildings. But atmospheric challenges such as haze, fog, and rain cause signal loss while transmitting data in free space. Also, atmospheric turbulence and antenna misalignments lead to signal error. This paper proposed the models of QAM and PSK digital modulated signal transmission over FO-FSO and compared the results to better fiber optic-FSO links to achieve a last-mile communication network. This fiber optic and FSO model is analyzed for the distance up to 100 km of fiber optic channel and 0.4-1.5 km of FSO channel. Constellation diagrams and error-vector magnitude (EVM) concerning received power at the receiver are compared to analyze FSO channel capacity for various weather attenuations.

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Section: Fso Channel Modelmentioning

confidence: 99%

Investigation of PSK/Qam Modulated Hybrid Fiber Optic and Free Space Optic System Under Various Atmospheric Losses

Kumar

Kumar²,

Singh³

2023

AEJ

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“…In each TX, the generated optical signal from the laser diode is passed through the OFDM modulator having a 16-QAM modulation format. For a low-pass cosine roll off filter, the transfer function is given as follows [23]:…”

Section: Mathematical Descriptionmentioning

confidence: 99%

“…∆ f FW HM is the full width at a half-maximum frequency between f 1 and f 2 . Here, for the cutoff frequency, f c , parameters f 1 and f 2 are given as follows [23]:…”

Section: Mathematical Descriptionmentioning

confidence: 99%

Investigation of OFDM-Based HS-PON Using Front-End LiFiSystem for 5G Networks

Kumari,

Banawan,

Arya

et al. 2023

Photonics

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Fifth-generation (5G) technology has enabled faster communication speeds, lower latency, a broader range of coverage, and greater capacity. This research aims to introduce a bidirectional high-speed passive optical network (HS-PON) for 5G applications and services including mobile computing, cloud computing, and fiber wireless convergence. Using 16-ary quadrature amplitude modulation orthogonal frequency division multiplexing techniques, the system transmits uplinks and downlinks with a pair of four wavelengths each. Light fidelity (LiFi) services are provided with blue light-emitting-diode-based technology. With a threshold bit error rate (BER) of 10−3, the results demonstrate reliable transportation over a 100 km fiber at −17 dBm received power and in a maximum LiFi range of 20 m. Furthermore, the system offers symmetric 4 × 50 Gbps transmission rates under the impact of fiber–LiFi channel impairments with maximum irradiance and incidence half-angles of 500. Additionally, at threshold BER, the system provides a detection surface range from 1.5 to 4 cm2. Compared to existing networks, the system also provides a high gain and low noise figure. A number of features make this system an attractive option. These include its high speed, high reach, high split ratio, low cost, easy upgradeability, pay-as-you-grow properties, high reliability, and ability to accommodate a large number of users.

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“…one that has the property of vestigial symmetry. This means that its spectrum exhibits odd symmetry about 1/2T, where T is the symbol-period of the communications system [19] - [23]. Its frequency response is a piecewise function given by [18]:…”

Section: Dispersion Compensation Using Raised Cosine Filtersmentioning

confidence: 99%

“…The variable phase response of the APFs makes them to be used as the phase equalizers to compensate the chromatic dispersion [8] - [17]. Since APF gives complexity and increases cost so new class of digital filters called raised cosine filters [18] - [23] are now introduced to compensate dispersion.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Compensation Using Raised Cosine Filter inOptical Fibers

Devra¹

2011

IJIEE

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All pass filters (APFs) are used in dispersion compensation which is the foremost requirement in an optical fiber link. All pass filters can correct any order of dispersion by the careful design of multistage all pass filters starting from very simple components with the use of N port devices. Multiple channels, as in wavelength division multiplexed (WDM) system, can be compensated with a single device since these filters are periodic in phase response. The design technique and implementation of these filters has been discussed in this paper. The simulation results obtained with raised cosine filters (RCFs) are presented in this paper. The results obtained using RCF to compensate dispersion show improvement in terms of eye diagram.

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Analysis of Raised Cosine Filtering in Communication Systems

Cited by 12 publications

References 4 publications

Investigation of PSK/Qam Modulated Hybrid Fiber Optic and Free Space Optic System Under Various Atmospheric Losses

Investigation of PSK/Qam Modulated Hybrid Fiber Optic and Free Space Optic System Under Various Atmospheric Losses

Investigation of OFDM-Based HS-PON Using Front-End LiFiSystem for 5G Networks

Dispersion Compensation Using Raised Cosine Filter inOptical Fibers

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