Sidelobe suppression using extended active interference cancellation with self-interferences constraint for cognitive OFDM systems

Zhiqiang Wang, Daiming Qu, Tao Jiang, Mahmoud Daneshmand

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Recently, increasing attention is paid to improving the spectrum utilization in cognitive OFDM systems. To enable coexistence between secondary users and primary users, a scheme, called as extended active interference cancellation (EAIC), was proposed for the effective sidelobe suppression of OFDM signals. However, with the EAIC method, the cancellation signals cause self-interferences to OFDM data subcarriers, which seriously degrades the symbol-error-rate performance, especially, when a high order modulation is used. In this paper, we analyze the self-interferences and formulate the minimization of both the total sidelobe power and the self-interferences as a optimization problem, which could be solved by least square method with acceptable complexity for OFDM communication systems nowadays. Simulation results show that the proposed EAIC-IC scheme provides a good sidelobe suppression performance of about 38.0 dB with signal-to-noise ratio loss less than 0.10 dB at symbol-error-rate of 10-3 when 64 QAM modulation is employed. Moreover, the proposed EAIC-IC scheme can provide an arbitrary tradeoff between the sidelobe suppression and the symbol-error-rate performance via adjusting the constraint parameter.

Original languageEnglish (US)
Pages (from-to)544-552
Number of pages9
JournalMobile Networks and Applications
Volume16
Issue number5
DOIs
StatePublished - Oct 1 2011

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Orthogonal frequency division multiplexing
Modulation
Quadrature amplitude modulation
Signal to noise ratio
Communication systems

All Science Journal Classification (ASJC) codes

  • Software
  • Information Systems
  • Hardware and Architecture
  • Computer Networks and Communications

Cite this

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abstract = "Recently, increasing attention is paid to improving the spectrum utilization in cognitive OFDM systems. To enable coexistence between secondary users and primary users, a scheme, called as extended active interference cancellation (EAIC), was proposed for the effective sidelobe suppression of OFDM signals. However, with the EAIC method, the cancellation signals cause self-interferences to OFDM data subcarriers, which seriously degrades the symbol-error-rate performance, especially, when a high order modulation is used. In this paper, we analyze the self-interferences and formulate the minimization of both the total sidelobe power and the self-interferences as a optimization problem, which could be solved by least square method with acceptable complexity for OFDM communication systems nowadays. Simulation results show that the proposed EAIC-IC scheme provides a good sidelobe suppression performance of about 38.0 dB with signal-to-noise ratio loss less than 0.10 dB at symbol-error-rate of 10-3 when 64 QAM modulation is employed. Moreover, the proposed EAIC-IC scheme can provide an arbitrary tradeoff between the sidelobe suppression and the symbol-error-rate performance via adjusting the constraint parameter.",
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Sidelobe suppression using extended active interference cancellation with self-interferences constraint for cognitive OFDM systems. / Wang, Zhiqiang; Qu, Daiming; Jiang, Tao; Daneshmand, Mahmoud.

In: Mobile Networks and Applications, Vol. 16, No. 5, 01.10.2011, p. 544-552.

Research output: Contribution to journalArticle

TY - JOUR

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