Mean square error analysis of improved receivers for unipolar communications - Asymmetrically Clipped Optical OFDM

Katz, Eyal; Laufer, Amir; Bar-Ness, Y.

doi:10.1109/noc.2012.6249932

Cited by 13 publications

(13 citation statements)

References 9 publications

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“…At receiver end, several different demodulation schemes are evaluated for comparison. Besides the proposed scheme, they include the OSCS, the PMLS, the DCS and its improved version IDCS with weighting factor [20][21][22] α ¼ 0.5. As optical OFDM has strong tolerance to attenuation and dispersion, we assume in the simulations that channel losses and dispersion are fully compensated by the equalizer.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

“…Several schemes [14,[20][21][22][23][24][25][26] have been established for demodulation of ACO-OFDM. However, as a key challenge, improving the demodulation performance of ACO-OFDM in practical systems has not been well addressed.…”

Section: Introductionmentioning

confidence: 99%

“…However, as a key challenge, improving the demodulation performance of ACO-OFDM in practical systems has not been well addressed. In the odd sub-carrier scheme (OSCS) [14], the clipping noise on even subcarriers was simply discarded, while later researches [20][21][22] revealed that the residual information carried by the clipping noise can be further explored to improve demodulation performance. Based on the fact that the clipping noise is equal to half of the absolute values of un-clipped amplitude, a diversity combining scheme (DCS) was proposed in [20] and then studied in [21,22] to combine the odd sub-carrier signal with the clipping noise in a non-linear way.…”

Section: Introductionmentioning

confidence: 99%

“…In the odd sub-carrier scheme (OSCS) [14], the clipping noise on even subcarriers was simply discarded, while later researches [20][21][22] revealed that the residual information carried by the clipping noise can be further explored to improve demodulation performance. Based on the fact that the clipping noise is equal to half of the absolute values of un-clipped amplitude, a diversity combining scheme (DCS) was proposed in [20] and then studied in [21,22] to combine the odd sub-carrier signal with the clipping noise in a non-linear way. In [23,24], by making use of the anti-symmetry property of ACO-OFDM signal, a pairwise maximum likelihood scheme (PMLS) was developed to cancel a significant amount of noise before demodulation of ACO-OFDM.…”

Section: Introductionmentioning

confidence: 99%

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A novel scheme for demodulation of ACO-OFDM in the presence of DC offset

Liu

2015

Journal of the Franklin Institute

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Section: Simulation Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel scheme for demodulation of ACO-OFDM in the presence of DC offset

Liu

2015

Journal of the Franklin Institute

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“…Ref. [8] also investigated this method. A different approach that exploited the structure of the transmitted time domain signal was proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

A Novel Receiver for ACO-OFDM in Visible Light Communication

Dang

Zhang

2013

IEEE Commun. Lett.

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This letter proposes a novel receiver for asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) system in visible light communication to enhance its performance. In ACO-OFDM, the even subcarriers are distorted by the clipping noise and are simply discarded in the conventional receiver. In this letter we show that the signals on the even subcarriers can be viewed as data-dependent precoded OFDM. A novel receiver based on minimum mean square error criteria is then proposed to exploit the even subcarriers to collect additional diversity and coding gains, leading to improved bit error rate performance. Simulations show that the proposed receiver provides significant signal-to-noise ratio gain (up to 10 dB) over the conventional receiver, especially in non-line-of-sight channels. Moreover, the proposed receiver is also superior to some existing advanced ones.Index Terms-ACO-OFDM, MIMO, iterative receiving, visible light communication.

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