Abstract
Layered Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (LACO-OFDM) has been proposed for optical communications and has attracted much attention, thanks to its flexibility in terms of power vs. spectral efficiency. In this article, we propose algorithms for optimizing the Discrete-input Continuous-output Memoryless Channel (DCMC) capacity of LACO-OFDM. Then, an algorithm is proposed for maximizing the capacity for twin-layer LACO-OFDM by optimizing the power sharing between the layers. This is followed by the conception of a more general algorithm applicable to LACO-OFDM having an arbitrary number of layers. Numerical results are provided for quantifying the capacity improvement attained by the proposed algorithm. Moreover, an adaptive scheme is proposed for adjusting the number of layers to be used for maximizing the capacity at different SNRs.
Highlights
O PTICAL Wireless Communication (OWC) is expected to play a role as a potential component of generation wireless systems, as a benefit of its low delay and low power consumption, as well as high integrity [1], [2]
We focus our attention on maximizing the total Discreteinput Continuous-output Memoryless Channel (DCMC) capacity of a LACO-Orthogonal Frequency Division Multiplexing (OFDM) system
A single Light-Emitting Diodes (LEDs) acts as the transmitter that serves a user within the room. As it has been shown in our previous work [23], the LACO-OFDM scheme is capable of drastically reducing the signal’s PAPR, we may assume that the LED operates
Summary
O PTICAL Wireless Communication (OWC) is expected to play a role as a potential component of generation wireless systems, as a benefit of its low delay and low power consumption, as well as high integrity [1], [2]. While ACOOFDM avoids the high power consumption of DCO-OFDM, requiring a lower SNR, this is facilitated by transmitting only half the information within the same bandwidth [10]. This leads to a power- vs spectral- efficiency trade-off, when deciding which scheme to utilize. The DCMC capacity is a more realistic bound, since practical discrete modulation schemes are considered It was revealed in [31] that modulation schemes whose modulation-order is excessively high may not be suitable for O-OFDM, given their vulnerability to clipping distortion.
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