Details

Autor(en) / Beteiligte

• Tran, N.N.
• Nguyen, H.H.
• Tuan, H.D.
• Dodds, D.E.

Titel

Training signal designs for spatially correlated multi-user multi-input multi-output with orthogonal frequency-division multiplexing systems

Ist Teil von

• IET communications, 2012-11, Vol.6 (16), p.2630-2638

Ort / Verlag

Stevenage: John Wiley & Sons, Inc

Erscheinungsjahr

2012

Beschreibungen/Notizen

• Optimal training design and channel estimation for spatially correlated multi-user multi-input multi-output with orthogonal frequency-division multiplexing (MIMO-OFDM) systems is still an open research topic of great interest. This study first applies tractable semi-definite programming (SDP), to obtain the optimal training signal for the general case of spatial channel correlations for multi-user MIMO-OFDM. In order to reduce the computational complexity of the SDP-based solution, an approximate solution in closed-form is then presented. For a special case of transmit correlations, an optimal solution in closed-form expression is also derived. Analytical and simulation results demonstrate the excellent performance of the proposed designs, and their performance advantage over the existing equi-powered training designs.