Abstract
In this paper, we investigate the optimization of direct current (DC) bias, information-bearing power and subcarrier power allocation in absolute valued DC biased optical orthogonal frequency division multiplexing (AV-DCO-OFDM) systems. First, we analyze the effect of absolute value operation on the system performance using the Bussgang Theorem. Then, we consider the maximization of achievable rate under the optical power constraint. Using the optimality conditions, the optimization problem can be simplified and two efficient algorithms are developed to obtain the solutions in flat channels and dispersive channels, respectively. Simulation results validate the theoretical analysis and the effectiveness of the developed algorithms.
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