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Transactions: WSEAS TRANSACTIONS ON SIGNAL PROCESSING
Transactions ID Number: 42-325
Full Name: Raungrong Suleesathira
Position: Associate Professor
Age: ON
Sex: Female
Address: 126 Pracha-utis Rd., Department of Electronic and Telecommunication Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Tungkru, Bangkok, 10140
Country: THAILAND
Tel: 6624709060
Tel prefix:
Fax: 6624709071
E-mail address: raungrong.sul@kmutt.ac.th
Other E-mails: raungrong@gmail.com
Title of the Paper: Co-channel Interference Cancellation for Space-Time Coded OFDM Systems Using Adaptive Beamforming and Null Deepening
Authors as they appear in the Paper: Raungrong Suleesathira
Email addresses of all the authors: raungrong.sul@kmutt.ac.th
Number of paper pages: 10
Abstract: Combined with space-time coding, the orthogonal frequency division multiplexing (OFDM) system explores space diversity. It is a potential scheme to offer spectral efficiency and robust high data rate transmissions over frequency-selective fading channel. However, space-time coding impairs the system ability to suppress interferences as the signals transmitted from two transmit antennas are superposed and interfered at the receive antennas. In this paper, we developed an adaptive beamforming based on least mean squared error algorithm and null deepening to combat co-channel interference (CCI) for the space-time coded OFDM (STC-OFDM) system. To illustrate the performance of the presented approach, it is compared to the null steering beamformer which requires a prior knowledge of directions of arrival (DOAs). The structure of space-time decoders are preserved although there is the use of beamformers before decoding. By incorporating the proposed beamformer as a CCI ca!
nceller in the STC-OFDM systems, the performance improvement is achieved as shown in the simulation results.
Keywords: Adaptive antenna arrays, Beamforming, Orthogonal frequency division multiplexing, Space-time coding
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