Browsing by Author "Chen, Ching-Hui"

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BER OPTIMIZED UNIMODE PRECODER DESIGN FOR MIMO-OFDM BASED SPATIAL MULTIPLEXING SYSTEMS
(2011)
Chen, Ching-Hui
;
Fung, Carrson C.
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A bit error rate optimized unimode selection algorithm is proposed for MIMO-OFDM based spatial multiplexing systems using linear receivers. For a fixed number of antennas, the proposed scheme dynamically selects the number of subcarriers used for transmission. The proposed method increases the diversity advantage of spatial multiplexing systems without the use of computational expensive space-time receivers such as ML and VBLAST. Simulation results show that the proposed unimode technique outperforms existing ones in terms of link reliability by performing selection of data streams across different subcarriers, and compensating significantly attenuated subcarriers due to deep fades.
PACKETIZED VIDEO TRANSMISSION FOR OFDM WIRELESS SYSTEMS WITH DYNAMIC ORDERED SUBCARRIER SELECTION ALGORITHM
(2009)
Chen, Ching-Hui
;
Fung, Carrson C.
;
Wang, Sheng-Jyh
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, we proposed a dynamic ordered subcarrier selection algorithm (DOSSA) for OFDM based video transmission system. The proposed scheme is shown to achieve lower bit error rate (BER) than the previously proposed OSSA by first selecting a fraction of the subcarriers with highest channel gain. The content information is then exploited in order to extend the OSSA to achieve unequal error protection (UEP) for packets of different importance. Simulation results show that system that utilizes the proposed scheme can achieve higher PSNR, especially at low SNR, compared to those that use the equal error protection (EEP) OSSA.