Details

Autor(en) / Beteiligte

• Xiaoli Ma
• Giannakis, G.B.
• Ohno, S.

Titel

Optimal training for block transmissions over doubly selective wireless fading channels

Ist Teil von

• IEEE transactions on signal processing, 2003-05, Vol.51 (5), p.1351-1366

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2003

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• High data rates give rise to frequency-selective propagation, whereas carrier frequency-offsets and mobility-induced Doppler shifts introduce time-selectivity in wireless links. To mitigate the resulting time- and frequency-selective (or doubly selective) channels, optimal training sequences have been designed only for special cases: pilot symbol assisted modulation (PSAM) for time-selective channels and pilot tone-assisted orthogonal frequency division multiplexing (OFDM) for frequency-selective channels. Relying on a basis expansion channel model, we design low-complexity optimal PSAM for block transmissions over doubly selective channels. The optimality in designing our PSAM parameters consists of maximizing a tight lower bound on the average channel capacity that is shown to be equivalent to the minimization of the minimum mean-square channel estimation error. Numerical results corroborate our theoretical designs.