Effects of Channel Estimation on Multiuser Virtual MIMO-OFDMA Relay-Based Networks

Jiménez, Víctor P. Gil; Ribeiro, Carlos; Gameiro, Atilio; Armada, Ana García

http://hdl.handle.net/10400.8/14445

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Effects of channel estimation on multiuser virtual MIMO-OFDMA relay-based networks.pdf	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 6dB 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.	605.94 KB	Adobe PDF	Download

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Authors

Jiménez, Víctor P. Gil

Ribeiro, Carlos

Gameiro, Atilio

Armada, Ana García

Abstract(s)

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 6dB 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.

Keywords

Orthogonal Frequency Division Multiplex Channel Estimation Channel State Information Orthogonal Frequency Division Multiple Access LDPC Code

URI

http://hdl.handle.net/10400.8/14445

Citation

Gil Jiménez, V.P., Ribeiro, C., Gameiro, A. et al. Effects of Channel Estimation on Multiuser Virtual MIMO-OFDMA Relay-Based Networks. J Wireless Com Network 2010, 764784 (2010). https://doi.org/10.1155/2010/764784.