A Novel Power-Efficient Scheme Spectrally and Energy Efficient (SEE) - OFDM for IM/DD Optical Systems
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 10
Abstract
Spectrally and energy efficient orthogonal frequency division multiplexing (SEE-OFDM) is an optical OFDM technique based on combining multiple asymmetrically clipped optical OFDM (ACO-OFDM) signals into one OFDM signal. By summing different components together, SEE-OFDM can achieve the same spectral efficiency as DC-biased optical OFDM (DCO-OFDM) without an energy-inefficient DC-bias. This paper introduces multiple methods for decoding a SEE-OFDM symbol and shows that an iterative decoder with hard decisions gives the best performance. Being a multi-component format, different energy allocation amongst the different components of SEE-OFDM is possible. However, equal energy allocation performs 1.5 dB better than unequal energy allocation. A hard-decision, iterative subtraction receiver can further increase performance by another 1.5 dB over soft-decision subtraction and reconstruction receivers. SEE-OFDM consistently performs 3dB or better and with higher spectral efficiency than ACO-OFDM at the same bit-error-rate (BER). Comparing other combination methods at the same BER, SEE-OFDM performs up to 3 dB better than hybrid asymmetrically clipped optical.
Authors and Affiliations
Nimitha N, Poovizhi S
Keywords
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