Pilot-assisted PAPR reduction technique for optical OFDM communication systems

Waisu O. Popoola, Zahib Ghassemlooy, Brian G. Stewart

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

This paper investigates the use of a pilot signal in reducing the electrical peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) intensitymodulated optical wireless communication system. The phase of the pilot signal is chosen based on the selected mapping (SLM) algorithm while the maximum likelihood criterion is used to estimate the pilot signal at the receiver. Bit error rate (BER) performance of the pilot-assisted optical OFDM system is identical to that of the basic optical OFDM (with no pilot and no PAPR reduction technique implemented) at the desired BER of less than 10−3 needed to establish a reliable communication link. The pilot-assisted PAPR reduction technique results in higher reduction in PAPR for high order (M >4) constellations than the classical SLM. With respect to a basic OFDM system, with no pilot and no PAPR reduction technique implemented, a pilot-assisted M-QAM optical OFDM system is capable of reducing the electrical PAPR by over about 2.5 dB at a modest complementary cumulative distribution function (CCDF) point of 10−4 forM = 64. Greater reductions in PAPR are possible at lower values of CCDF with no degradation to the system’s error performance. Clipping the time domain signal at both ends mildly (at 25 times the signal variance level) results in a PAPR reduction of about 6.3 dB at the same CCDF of 10−4 but with an error floor of about 3 × 10−5 . Although it is possible to attain any desired level of electrical PAPR reduction with signal clipping, this will be at a cost of deterioration in the systems’s bit error performance.
LanguageEnglish
Pages1374-1382
Number of pages9
JournalJournal of Lightwave Technology
Volume32
Issue number7
DOIs
Publication statusPublished - 1 Apr 2014

Fingerprint

frequency division multiplexing
telecommunication
distribution functions
bit error rate
quadrature amplitude modulation
constellations
wireless communication
deterioration
receivers
communication
degradation
costs

Keywords

  • average optical power reduction
  • optical communications
  • orthogonal frequency division multiplexing (OFDM)
  • optical wireless
  • PAPR reduction
  • pilot-assisted modulation
  • optical receivers
  • adaptive optics

Cite this

Popoola, Waisu O. ; Ghassemlooy, Zahib ; Stewart, Brian G. / Pilot-assisted PAPR reduction technique for optical OFDM communication systems. In: Journal of Lightwave Technology. 2014 ; Vol. 32, No. 7. pp. 1374-1382.
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abstract = "This paper investigates the use of a pilot signal in reducing the electrical peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) intensitymodulated optical wireless communication system. The phase of the pilot signal is chosen based on the selected mapping (SLM) algorithm while the maximum likelihood criterion is used to estimate the pilot signal at the receiver. Bit error rate (BER) performance of the pilot-assisted optical OFDM system is identical to that of the basic optical OFDM (with no pilot and no PAPR reduction technique implemented) at the desired BER of less than 10−3 needed to establish a reliable communication link. The pilot-assisted PAPR reduction technique results in higher reduction in PAPR for high order (M >4) constellations than the classical SLM. With respect to a basic OFDM system, with no pilot and no PAPR reduction technique implemented, a pilot-assisted M-QAM optical OFDM system is capable of reducing the electrical PAPR by over about 2.5 dB at a modest complementary cumulative distribution function (CCDF) point of 10−4 forM = 64. Greater reductions in PAPR are possible at lower values of CCDF with no degradation to the system’s error performance. Clipping the time domain signal at both ends mildly (at 25 times the signal variance level) results in a PAPR reduction of about 6.3 dB at the same CCDF of 10−4 but with an error floor of about 3 × 10−5 . Although it is possible to attain any desired level of electrical PAPR reduction with signal clipping, this will be at a cost of deterioration in the systems’s bit error performance.",
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Pilot-assisted PAPR reduction technique for optical OFDM communication systems. / Popoola, Waisu O.; Ghassemlooy, Zahib; Stewart, Brian G.

In: Journal of Lightwave Technology, Vol. 32, No. 7, 01.04.2014, p. 1374-1382.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Pilot-assisted PAPR reduction technique for optical OFDM communication systems

AU - Popoola, Waisu O.

AU - Ghassemlooy, Zahib

AU - Stewart, Brian G.

PY - 2014/4/1

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N2 - This paper investigates the use of a pilot signal in reducing the electrical peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) intensitymodulated optical wireless communication system. The phase of the pilot signal is chosen based on the selected mapping (SLM) algorithm while the maximum likelihood criterion is used to estimate the pilot signal at the receiver. Bit error rate (BER) performance of the pilot-assisted optical OFDM system is identical to that of the basic optical OFDM (with no pilot and no PAPR reduction technique implemented) at the desired BER of less than 10−3 needed to establish a reliable communication link. The pilot-assisted PAPR reduction technique results in higher reduction in PAPR for high order (M >4) constellations than the classical SLM. With respect to a basic OFDM system, with no pilot and no PAPR reduction technique implemented, a pilot-assisted M-QAM optical OFDM system is capable of reducing the electrical PAPR by over about 2.5 dB at a modest complementary cumulative distribution function (CCDF) point of 10−4 forM = 64. Greater reductions in PAPR are possible at lower values of CCDF with no degradation to the system’s error performance. Clipping the time domain signal at both ends mildly (at 25 times the signal variance level) results in a PAPR reduction of about 6.3 dB at the same CCDF of 10−4 but with an error floor of about 3 × 10−5 . Although it is possible to attain any desired level of electrical PAPR reduction with signal clipping, this will be at a cost of deterioration in the systems’s bit error performance.

AB - This paper investigates the use of a pilot signal in reducing the electrical peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) intensitymodulated optical wireless communication system. The phase of the pilot signal is chosen based on the selected mapping (SLM) algorithm while the maximum likelihood criterion is used to estimate the pilot signal at the receiver. Bit error rate (BER) performance of the pilot-assisted optical OFDM system is identical to that of the basic optical OFDM (with no pilot and no PAPR reduction technique implemented) at the desired BER of less than 10−3 needed to establish a reliable communication link. The pilot-assisted PAPR reduction technique results in higher reduction in PAPR for high order (M >4) constellations than the classical SLM. With respect to a basic OFDM system, with no pilot and no PAPR reduction technique implemented, a pilot-assisted M-QAM optical OFDM system is capable of reducing the electrical PAPR by over about 2.5 dB at a modest complementary cumulative distribution function (CCDF) point of 10−4 forM = 64. Greater reductions in PAPR are possible at lower values of CCDF with no degradation to the system’s error performance. Clipping the time domain signal at both ends mildly (at 25 times the signal variance level) results in a PAPR reduction of about 6.3 dB at the same CCDF of 10−4 but with an error floor of about 3 × 10−5 . Although it is possible to attain any desired level of electrical PAPR reduction with signal clipping, this will be at a cost of deterioration in the systems’s bit error performance.

KW - average optical power reduction

KW - optical communications

KW - orthogonal frequency division multiplexing (OFDM)

KW - optical wireless

KW - PAPR reduction

KW - pilot-assisted modulation

KW - optical receivers

KW - adaptive optics

U2 - 10.1109/JLT.2014.2304493

DO - 10.1109/JLT.2014.2304493

M3 - Article

VL - 32

SP - 1374

EP - 1382

JO - Journal of Lightwave Technology

T2 - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

SN - 0733-8724

IS - 7

ER -