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Effects of channel estimation on multiuser virtual MIMO-OFDMA relay-based networks

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URI: https://hdl.handle.net/10016/14426
ISSN: 1687-1472
DOI: 10.1155/2010/764784
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JWCN_virtual_2010.pdf (1.43 MB)
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2010-11-11
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SpringerOpen
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Abstract
A practical multiuser cooperative transmission scheme denoted as Virtual Maximum Ratio Transmission (VMRT) for multiple-input multiple-output-orthogonal frequency division multiple access (MIMO-OFDMA) relay-based networks is proposed and evaluated in the presence of a realistic channel estimation algorithm and using low-density parity-check (LDPC) codes. It is shown that this scheme is robust against channel estimation errors. It offers diversity and array gain, keeping the complexity low with a multiuser and multiantenna channel estimation algorithm that is simple and efficient. In addition, the combination with LDPC codes provides improved gains; diversity gains larger than 6 dB can be easily obtained with a reduced number of relays. Thus, this scheme can be used to extend coverage or increase system throughput by using simple cooperative OFDMA-based relays.
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MIMO-OFDM systems, Multiuser
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EURASIP Journal on Wireless Communications and Networking 2010, 2010:764784
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