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We present analytical results on the operation of a pre-amplified optical wireless communication (OWC) system that also takes advantage of spatial diversity to improve its outage probability and average bit-error-rate (BER) performance against turbulence induced fading. The paper focuses on the design of an optimal electronic combiner that minimizes the instantaneous BER for any given channel state...
In this paper, we discuss the mitigation of negative-exponential fading in Optical Wireless Communication (OWC) systems. The mitigation technique involves the utilization of a semiconductor optical amplifier (SOA) whose gain saturates in normal link operation, but which also provides a power-dependent varying gain when the link experiences a fade. The unbalanced SOA operation serves towards the equalization...
In this paper, we evaluate the utilization of a semiconductor optical amplifier (SOA) at the receiver of an outdoor optical wireless system for fade mitigation purposes. Due to its instantaneous gain response, the SOA provides saturating gain to incoming pulses and partially alleviates power variations between fade impaired and non-impaired instances of the received signal. We discuss this unbalanced...
The presence of software and middleware technologies based on open APIs and protocols for advanced service provision in telecoms is the main subject of this article. Specifically, the role and the trade-off between open APIs and Protocols, i.e. OSA/Parlay APIs, JAIN APIs and SIP, in modern telecoms are addressed. We present a technical implementation analysis, based on a call-related telecom service,...
The spectral efficiency of L-branch selection diversity (SD) receiver with different adaptive transmission techniques operating over generalised-Gamma (GG) fading channels is studied. Novel expressions for important adaptive transmission techniques are obtained, namely optimal power and rate adaptation, optimal rate adaptation, channel inversion with fixed rate (CIFR) and truncated CIFR. Furthermore,...
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