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

publication date

  • November 2010

start page

  • 1

end page

  • 13


  • 764784

International Standard Serial Number (ISSN)

  • 1687-1472

Electronic International Standard Serial Number (EISSN)

  • 1687-1499


  • 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.