Superimposed Pilot Aided Multiuser Channel Estimation for MIMO-OFDM Uplinks

  • Yang, Qinghai (Graduate School of Information Technology and Telecommunications, Inha University) ;
  • Kwak, Kyung-Sup (Graduate School of Information Technology and Telecommunications, Inha University)
  • Received : 2006.03.16
  • Published : 2006.10.31

Abstract

This letter addresses the superimposed pilot aided multiuser channel estimation for the uplinks of multi-input multi-output orthogonal frequency-division multiplexing systems. To mitigate the embedded-data effects on the performance of channel estimation, a novel combining algorithm is proposed. Optimal pilot symbols are developed with respect to the least square channel estimate's mean square error. The averaged sum-capacity lower bound is derived and simulated. Simulation results show that on a low signal-to-noise ratio regime, our proposed scheme achieves better performance and higher capacity than the conventional pilot aided approach.