Posted: 83 months ago
Inglese > Italiano: Traduzione del Libro: Principles of LED Light
Traduzione del Libro: Principles of LED Light
Communications
Towards Networked Li-Fi
Esempio di testo:
OWC can be described by the following continuous-time model for a noisy communication
link:
y = h ∗ F(x) + w , (2.2)
where y(t) represents the received distorted replica of the transmitted signal, x(t), which
is subjected to the non-linear distortion function, F
x(t)
, of the transmitter front-end.
The non-linearly distorted transmitted signal is convolved with the channel impulse
response, h(t), and it is distorted by AWGN, w(t), at the receiver. Here, ∗ denotes linear
convolution. The generalized model of the OWC link in the time domain is illustrated
in Fig. 2.5. Since the OWC system is implemented by means of a DSP, the following
equivalent discrete model for a noisy communication link is employed in the system
description:
y = h F(x) + w , (2.3)
where denotes discrete linear convolution. Here, the transmitted signal vector, x,
contains Zx samples, the channel impulse response vector, h, has Zh samples, and, as
a result, the AWGN vector, w, and the received signal vector, y, have Zx + Zh − 1
samples [99]. The discrete signal vectors are obtained by sampling of the equivalent
continuous-time signals. The sampling rates over a time period of T differ in the considered
systems, and the details are presented in Section 3.2.
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