Jiménez, Víctor P. GilRibeiro, CarlosGameiro, AtilioArmada, Ana García2025-10-312025-10-312010-11-14Gil 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/10.1155/2010/764784.1687-1472http://hdl.handle.net/10400.8/14445A 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.engOrthogonal Frequency Division MultiplexChannel EstimationChannel State InformationOrthogonal Frequency Division Multiple AccessLDPC Codejournal article10.1155/2010/7647841687-1499