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The high peak-to-average-power ratio (PAPR) of orthogonal frequency-divisionmultiplexing (OFDM) degrades the performance in optical wireless communicationsystems. This paper proposes a modified asymmetrically clipped optical OFDM(ACOOFDM) with low PAPR via introducing a recoverable upper-clipping (RoC)procedure. Although some information is clipped by a predetermined peakthreshold, the clipped error information is kept and repositioned in ourproposed scheme, which is named RoC-ACO-OFDM, instead of simply being droppedin conventional schemes. The proposed method makes full use of the specificstructure of ACO-OFDM signals in the time domain, where half of the positionsare forced to zeros within an OFDM symbol. The zero-valued positions areutilized to carry the clipped error information. Moreover, we accordinglypresent an optimal maximum a posteriori (MAP) detection for the RoC-ACO-OFDMsystem. To facilitate the usage of RoC-ACO-OFDM in practical applications, anefficient detection method is further developed with near-optimal performance.Simulation results show that the proposed RoC-ACO-OFDM achieves a significantPAPR reduction, while maintaining a competitive bit-error rate performancecompared with the conventional schemes.

ACO-OFDM-Specified Recoverable Upper Clipping With Efficient Detection for Optical Wireless Communications