Abstract
We report on experimental demonstration of 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application. MIMO-OFDM algorithms effectively compensate for impairments in the wireless link. Error-free signal demodulation of 64 subcarrier 4-QAM signals modulated at 198.5 Mb/s net data rate is achieved after fiber and 2 m indoor wireless transmission. We report BER of 7x10(-3) at the receiver for 16-QAM signals modulated at 397 Mb/s after 1 m of wireless transmission. Performance dependence on different wireless transmission path lengths, antenna separation, and number of subcarriers have been investigated.
Highlights
Wireless networks based on radio over fiber (RoF) technologies have been proposed as a promising cost effective solution to meet ever increasing user demands for high data rate and mobility
We report on experimental demonstration of 2x2 Multiple input multiple output (MIMO)-Orthogonal frequency division multiplexing (OFDM) 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application
MIMO-OFDM algorithms effectively compensate for impairments in the wireless link
Summary
Wireless networks based on radio over fiber (RoF) technologies have been proposed as a promising cost effective solution to meet ever increasing user demands for high data rate and mobility. Multiple input multiple output (MIMO) is widely used to increase wireless bit rates [2] and improve larger area coverage than traditional single input single output (SISO) antennas Such multiple antenna techniques, present a challenge for RoF systems, which have to ensure clean transmission of multiple signals between elements of the antenna array, and must mitigate signal path impairments which introduce crosstalk, attenuation and multipath fading [3]. A training-based channel estimation method has the relatively low computational complexity at the receiver [7] and draws more interest in analyzing multicarrier systems
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