Improved FBMC/OQAM uplink performance using an antenna array in a highly frequency selective fading channel

Yekaterina Kim, Heungseop Ahn, Daejin Kim, Seungwon Choi

Research output: Contribution to journalArticle

Abstract

Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an attractive alternative to orthogonal frequency division multiplexing, as it yields a higher spectral efficiency and robustness to frequency dispersion; however, FBMC/OQAM suffers from multipath interference owing to the absence of the cyclic prefix, especially in the signal environments of widely spread multipaths. Although conventional techniques such as multiple-input multiple-output along with equalization can combat multipath fading, these techniques do not effectively resolve the multipath interference unless each subcarrier channel can be assumed to be of a flat fading. This article presents a systematic procedure of applying a receive antenna array to FBMC/OQAM systems that removes the multipath interferences using a nicely-shaped beam pattern for each of the multipaths associated with a severe frequency selectivity. The performance of the proposed array system has been demonstrated in terms of its bit error rate in the adverse multipath-spread environment of the Extended Typical Urban model of the 3rd Generation Partnership Project, in which each subcarrier channel suffers from a severe frequency-selective fading. Using various computer simulations, we found that the proposed array system can completely resolve multipath interferences with an array of N = 10, 16, and 22 when Δθ = 15°, 10°, and 5°, respectively, where N and Δθ denote the number of antennas in each subarray and the interpath direction of arrival difference, respectively. In addition, the proposed array system also provides a signal-to-noise ratio gain that is proportional to N, once the multipath interferences are successfully resolved.

Original languageEnglish
Pages (from-to)289-300
Number of pages12
JournalMicrowave and Optical Technology Letters
Volume62
Issue number1
DOIs
StatePublished - 2020 Jan 1

Fingerprint

selective fading
quadrature amplitude modulation
Frequency selective fading
Filter banks
Quadrature amplitude modulation
antenna arrays
Antenna arrays
Fading channels
interference
filters
fading
Multipath fading
Direction of arrival
Bit error rate
Orthogonal frequency division multiplexing
Signal to noise ratio
frequency division multiplexing
combat
MIMO (control systems)
Antennas

Keywords

  • OFDM
  • beamforming
  • filter bank multicarrier
  • multipath interference
  • multiple antenna

Cite this

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abstract = "Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an attractive alternative to orthogonal frequency division multiplexing, as it yields a higher spectral efficiency and robustness to frequency dispersion; however, FBMC/OQAM suffers from multipath interference owing to the absence of the cyclic prefix, especially in the signal environments of widely spread multipaths. Although conventional techniques such as multiple-input multiple-output along with equalization can combat multipath fading, these techniques do not effectively resolve the multipath interference unless each subcarrier channel can be assumed to be of a flat fading. This article presents a systematic procedure of applying a receive antenna array to FBMC/OQAM systems that removes the multipath interferences using a nicely-shaped beam pattern for each of the multipaths associated with a severe frequency selectivity. The performance of the proposed array system has been demonstrated in terms of its bit error rate in the adverse multipath-spread environment of the Extended Typical Urban model of the 3rd Generation Partnership Project, in which each subcarrier channel suffers from a severe frequency-selective fading. Using various computer simulations, we found that the proposed array system can completely resolve multipath interferences with an array of N = 10, 16, and 22 when Δθ = 15°, 10°, and 5°, respectively, where N and Δθ denote the number of antennas in each subarray and the interpath direction of arrival difference, respectively. In addition, the proposed array system also provides a signal-to-noise ratio gain that is proportional to N, once the multipath interferences are successfully resolved.",
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Improved FBMC/OQAM uplink performance using an antenna array in a highly frequency selective fading channel. / Kim, Yekaterina; Ahn, Heungseop; Kim, Daejin; Choi, Seungwon.

In: Microwave and Optical Technology Letters, Vol. 62, No. 1, 01.01.2020, p. 289-300.

Research output: Contribution to journalArticle

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