Bandwidth Efficient Root Nyquist Pulses for Optical Intensity Channels
| Autor: | Sabeena Fatima, A. D. Raza, S. Sheikh Muhammad |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Inter Symbol Interference
PSWF (Prolate Spheroidal Wave Functions) Bandlimiting optical intensity signaling Modified Hermite Polynomial Function ISI Optics Nyquist–Shannon sampling theorem ISI (Inter Symbol Interference) Electrical and Electronic Engineering Computer Science::Information Theory Physics Nyquist Pulse business.industry Bandwidth (signal processing) Pulse duration PSWF MHPF MHPF (Modified Hermite Polynomial Function) Light intensity Amplitude lcsh:Electrical engineering. Electronics. Nuclear engineering Nyquist rate Prolate Spheroidal Wave Functions business lcsh:TK1-9971 Bandwidth-limited pulse |
| Zdroj: | Radioengineering, Vol 24, Iss 1, Pp 17-24 (2015) Radioengineering. 2015 vol. 24, č. 1, s. 17-24. ISSN 1210-2512 |
| ISSN: | 1210-2512 |
| DOI: | 10.13164/re.2015.0017 |
| Popis: | Indoor diffuse optical intensity channels are bandwidth constrained due to the multiple reflected paths be- tween the transmitter and the receiver which cause consider- able inter-symbol interference (ISI). The transmitted signal amplitude is inherently non-negative, being a light intensity signal. All optical intensity root Nyquist pulses are time- limited to a single symbol interval which eliminates the pos- sibility of finding bandlimited root Nyquist pulses. However, potential exists to design bandwidth efficient pulses. This pa- per investigates the modified hermite polynomial functions and prolate spheroidal wave functions as candidate wave- forms for designing spectrally efficient optical pulses. These functions yield orthogonal pulses which have constant pulse duration irrespective of the order of the function, making them ideal for designing an ISI free pulse. Simulation re- sults comparing the two pulses and challenges pertaining to their design and implementation are discussed. |
| Databáze: | OpenAIRE |
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