Browsing by Author "Lu, Tsung-Hung"

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2 x 2 MIMO radio-over-fiber system at 60 GHz employing frequency domain equalization
(2012-01-02)
Lin, Chun-Ting
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Ng'oma, Anthony
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Lee, Wei-Yuan
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Wei, Chia-Chien
;
Wang, Chih-Yun
This work experimentally demonstrates the efficacy of the 2 x 2 multiple-input multiple-output (MIMO) technique for capacity improvement of a 60-GHz radio-over-fiber (RoF) system employing single-carrier modulation format. We employ frequency domain equalization (FDE) to estimate the channel response, including frequency response of the 60 GHz RoF system and the MIMO wireless channel. Using FDE and MIMO techniques, we experimentally demonstrate the doubling the of wireless data capacity of a 60 GHz RoF system to 27.15 Gb/s using 16-QAM modulation format, with transmission over 25 km of standard single-mode fiber and 3 m wireless distance. (C) 2011 Optical Society of America
MIMO-Enhanced Radio-over-Fiber System at 60 GHz
(2011-01-01)
Lin, Chun-Ting
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Ng'oma, Anthony
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Lee, Wei-Yuan
;
Wang, Chih-Yun
;
Lu, Tsung-Hung
We employ 2x2 MIMO spatial multiplexing to double the spectral efficiency of a 60GHz RoF system. A 27.15-Gbps 16-QAM MIMO signal with 3m wireless transmission is experimentally demonstrated within 7-GHz license -free spectrum at 60 GHz.
Performance Evaluation of a 60 GHz Radio-over-Fiber System Employing MIMO and OFDM Modulation
(2013-12-01)
Ho, Chun-Hung
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Jiang, Wen-Jr
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Sambaraju, Rakesh
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Lee, Wei-Yuan
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Lu, Tsung-Hung
Multiple-input-multiple-output (MIMO) technique for wireless communications is extensively used these days, especially to increase the spectral efficiency of new wireless communication systems like LTE, WiMAX, etc. MIMO in combination with robust modulation techniques like orthogonal frequency division multiplexing (OFDM) provides a good solution for high data rate wireless links. In this paper, the performance of MIMO for a 60 GHz OFDM radio over fiber link is analyzed. System performance of the MIMO system for different antenna spacing is also studied. Using the optimum system parameters, a MIMO OFDM wireless link of up to 51 Gb/s was successfully demonstrated at 60 GHz in a bandwidth of <7 GHz, with a wireless transmission distance of up to 4 m and optical fiber transmission of 1 km. To our knowledge this is the highest data rate demonstrated in the 7 GHz band of 60 GHz.
Study of Wireless Channel Characteristics of 2x2 60-GHz MIMO OFDM RoF System Employing Lattice Reduction-aided Detection
(2013)
Huang, Hou-Tzu
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Ho, Chun-Hung
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Lu, Tsung-Hung
;
Wang, Chih-Yun
;
Lin, Chun-Ting
We experimentally investigate the wireless channel characteristics of 2x2 60-GHz MIMO OFDM RoF system with 3.5-m wireless distance. With lattice-reduction-aided detection, the achievable data rate can be improved from 0.58Gbps to 12.61Gbps for the worst case.
Theoretical and Experimental Investigation of a 2 x 2 MIMO OFDM Radio-Over-Fiber System at 60-GHz With I/Q Imbalance Compensation
(2014-10-15)
Ho, Chun-Hung
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Lin, Chun-Ting
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Lu, Tsung-Hung
;
Huang, Hou-Tzu
;
Shih, Boris (Po-Tsung)
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 x 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 similar to 1 dB.