Theoretical and Experimental Investigation of a 2 × 2 MIMO OFDM Radio-Over-Fiber System at 60-GHz With I/Q Imbalance Compensation

Author

Chun-Hung Ho ; Chun-Ting Lin ; Tsung-Hung Lu ; Hou-Tzu Huang ; Shih, Boris ; Chia-Chien Wei ; Ngoma, Anthony

Author_Institution

Inst. of Photonic Syst., Nat. Chiao-Tung Univ., Tainan, Taiwan

Volume

32

Issue

20

fYear

2014

fDate

Oct.15, 15 2014

Firstpage

3901

Lastpage

3909

Abstract

This paper investigates the efficacy of two methods for compensating I/Q imbalance, which causes serious performance problems in wideband (6.98-GHz spectrum) millimeter-wave systems employing MIMO signal transmission. A 60-GHz orthogonal frequency division multiplexing (OFDM) RoF system employing 2 × 2 MIMO technology is implemented using a commonly used training symbol arrangement and a proposed method. We experimentally demonstrate that the proposed training symbol arrangement performed significantly better than the commonly used approach. By combining the proposed training symbol arrangement with LMS I/Q compensation and bit-loading, we achieve an extremely high wireless data rate transmission of 75.211 Gb/s over both 50 km of standard single-mode fiber and 3.5-m wireless distance. The optical power penalty after 50-km fiber transmission was only ~1 dB.

Keywords

MIMO communication; OFDM modulation; broadband networks; least mean squares methods; radio-over-fibre; LMS I/Q imbalance compensation; MIMO OFDM radio-over-fiber system; MIMO signal transmission; bandwidth 6.98 GHz; bit rate 75.211 Gbit/s; bit-loading; distance 3.5 m; distance 50 km; frequency 60 GHz; in-phase and quadrature-phase imbalance compensation; least mean squares algorithms; multiple-input multiple-output; optical power penalty; orthogonal frequency division multiplexing RoF system; single-mode fiber transmission; training symbol arrangement; wideband millimeter wave system; wireless data rate transmission; wireless distance; Channel estimation; Least squares approximations; MIMO; OFDM; Training; Vectors; Wireless communication; I/Q imbalance; MIMO; optical fiber communication; wireless communication;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2014.2325816

Filename

6818995