Bit Error Probability Evaluation in Optically Preamplified Direct-Detection OFDM Systems Using the Moment Generating Function

Moment Generating Function for the Rigorous Performance Assessment of Direct-Detection Baseband OFDM Communication Systems

“…In contrast to [10], this formulation characterizes rigorously the noise statistics after OFDM signal demodulation. Firstly, the model of the optical DD-OFDM receiver is characterized.…”

“…Recently, the theoretical assessment of the performance of OFDM optical communication systems with direct-detection and pre-amplification at the receiver has been the subject of several works [7]- [10]. In the most recent work [10], an analytical formulation based on the calculation of the moment generating function (MGF) of the symbol detected in each OFDM subcarrier was developed to evaluate the performance of a baseband DD-OFDM optical receiver.…”

“…In the most recent work [10], an analytical formulation based on the calculation of the moment generating function (MGF) of the symbol detected in each OFDM subcarrier was developed to evaluate the performance of a baseband DD-OFDM optical receiver. This formulation assumes that the noise samples prior to the Fast-Fourier Transform (FFT) block input can be considered uncorrelated.…”

“…When this assumption is fulfilled, the proposed formulation provides reasonably accurate estimates of the performance of the DD-OFDM optical communication system. However, when the impact of the noise samples correlation on the performance is high, its precision is severely diminished [10].…”

“…In this work, a new MGF, which characterizes rigorously the statistics of the noise after photodetection and OFDM signal demodulation and solves the accuracy problem due to the noise samples correlation of the formulation reported in [10], is proposed. By using a semi-analytical simulation method [11], the MGF proposed in this work is used to evaluate rigorously the performance of optically pre-amplified DD-OFDM receivers.…”