Radio-over-fiber system for TDD-based OFDMA wireless communication systems

Hoon Kim, Jae Hun Cho, Sangho Kim, Ki Uk Song, Hanlim Lee, Jae Hoon Lee, Byungjik Kim, Yunje Oh, Jaekon Lee, Seongtaek Hwang

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We report on a fiber-optic transport system for next-generation wireless-communication systems utilizing 4 × 4multiple-input multiple-output (MIMO) orthogonal-frequency-division-multiple-access (OFDMA) technology. Our system supports time-division-duplex (TDD)-based wireless signals operating at 3.775 GHz. To accommodate the TDD-based MIMO signals over a single strand of optical fiber, we utilize nine-channel coarse wavelength-division-multiplexed optical channels: one for link delay measurement and TDD control signal transmission, four for downlink, and the others for uplink. The system first measures the propagation delay between the central base station (CBS) and the remote antenna (RA) and sends the result to delay modules to compensate for the delay added by the transmission link. This procedure makes the CBS and RA emit the downstream signals simultaneously into the air and, consequently, helps avoid the performance degradation caused by the propagation delay of the radio-over-fiber system. The system then sends the MIMO signals together with TDD control signals to the RA. Our experimental demonstration is carried out with 1-Gb/s OFDMA signals having pilot, control, and data channels. For downstream, the error vector magnitudes (EVMs) are measured to be < --30 dB after a 3.9-km transmission over conventional single-mode fiber when the antenna output power is set to be 24 dBm. For upstream, the best EVMs are measured to be < --35 dB. Both the downstream and upstream performance is limited by the shot and thermal noise of the receiver when the signal power is low, whereas nonlinear distortions of electrical amplifiers start to degrade the system performance as the signal power increases. We also measure the crosstalk between channels. It is measured to be less than --42 dB for all channels, which is found to be caused by board-to-board interference at the RA.

Original languageEnglish
Pages (from-to)3419-3427
Number of pages9
JournalJournal of Lightwave Technology
Volume25
Issue number11
DOIs
Publication statusPublished - 2007 Nov 1
Externally publishedYes

Fingerprint

frequency division multiple access
Radio-over-fiber
Frequency division multiple access
wireless communication
division
telecommunication
Communication systems
Antennas
fibers
MIMO systems
antennas
MIMO (control systems)
Base stations
Nonlinear distortion
Shot noise
Thermal noise
upstream
Single mode fibers
Crosstalk
stations

Keywords

  • Optical communication
  • Orthogonal frequency division multiple access (OFDMA)
  • Subcarrier multiplexing
  • Time division duplex (TDD)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

Radio-over-fiber system for TDD-based OFDMA wireless communication systems. / Kim, Hoon; Cho, Jae Hun; Kim, Sangho; Song, Ki Uk; Lee, Hanlim; Lee, Jae Hoon; Kim, Byungjik; Oh, Yunje; Lee, Jaekon; Hwang, Seongtaek.

In: Journal of Lightwave Technology, Vol. 25, No. 11, 01.11.2007, p. 3419-3427.

Research output: Contribution to journalArticle

Kim, H, Cho, JH, Kim, S, Song, KU, Lee, H, Lee, JH, Kim, B, Oh, Y, Lee, J & Hwang, S 2007, 'Radio-over-fiber system for TDD-based OFDMA wireless communication systems', Journal of Lightwave Technology, vol. 25, no. 11, pp. 3419-3427. https://doi.org/10.1109/JLT.2007.906807
Kim, Hoon ; Cho, Jae Hun ; Kim, Sangho ; Song, Ki Uk ; Lee, Hanlim ; Lee, Jae Hoon ; Kim, Byungjik ; Oh, Yunje ; Lee, Jaekon ; Hwang, Seongtaek. / Radio-over-fiber system for TDD-based OFDMA wireless communication systems. In: Journal of Lightwave Technology. 2007 ; Vol. 25, No. 11. pp. 3419-3427.
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