Abstract
Regarding a Pre-Distorted ADO-OFDM System as a DCO-OFDM System for Visible Light Communications
Highlights
In orthogonal frequency division multiplexing (OFDM) visible light communications, signals emitted from the transmitter are required to have both real and non-negative amplitudes
FIGURE 7. (126, 58) CA-Polar coded block error rate (BLER) performance for the asymmetrically clipped DC-biased optical (ADO) and the pre-distorted ADO based on CA-successive cancellation list-8 (SCL-8) decoding over a four-path fading channel
CONCLUDING REMARKS In this paper, we have shown that the pre-distorted ADO system can be regarded as a DCO system that has different power assignments in the odd and even-index subcarriers
Summary
In orthogonal frequency division multiplexing (OFDM) visible light communications, signals emitted from the transmitter are required to have both real and non-negative amplitudes. The asymmetrically clipped optical OFDM (ACO-OFDM) system was proposed by only assigning data on odd-index subcarriers and clipping all the resulting negative time-domain samples so that they become zero in order to meet the non-negative requirement. An asymmetrically clipped DC-biased optical (ADO) system [1]–[4] was proposed by hybridizing both the ACO and the DCO concepts to provide both power and spectrum efficiency. The resulting time-domain samples for the two branches are added together with a DC-bias current and a clipping process is followed in order to meet the nonnegative requirements as shown in Fig.. After passing through the IFFT devices, the time-domain samples are respectively denoted as xn,ACO and xn,DCO, for 0 ≤ n < N , which are real values, but not all positive. The IR structure can efficiently improve the BER performance when compared to the original receiver structure
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