Title :
Hexagonal Multicarrier Modulation: A Robust Transmission Scheme for Time-Frequency Dispersive Channels
Author :
Han, Fang-Ming ; Zhang, Xian-Da
Author_Institution :
Nat. Lab. of Radar Signal Process., Xidian Univ., Xi´´an
fDate :
5/1/2007 12:00:00 AM
Abstract :
By regarding signal transmission as tiling of the time-frequency plane, we propose a multicarrier transmission scheme on hexagonal lattice, coined the term hexagonal multicarrier modulation. To optimally combat the impact of the propagation channels, the underlying lattice parameters and the pulse shape of modulation waveform are jointly optimized to adapt to the channel scattering function from a minimum energy perturbation point of view. It comes out that there exist two equivalent pulse and lattice matching criteria for each channel scattering function to achieve minimal interpulse interference (IPI). Robustness of the proposed system against the wireless channels is analyzed in terms of robustness factor. Numerical analysis and simulation results show that the hexagonal multicarrier transmission system outperforms conventional orthogonal-frequency-division multiplexing (OFDM) and lattice-OFDM (LOFDM) systems with regard to robustness against channel dispersion
Keywords :
dispersive channels; modulation; radiofrequency interference; wireless channels; channel scattering function; hexagonal multicarrier modulation; interpulse interference; lattice matching criteria; multicarrier transmission scheme; propagation channels; signal transmission; time-frequency dispersive channels; wireless channels; Dispersion; Interference; Lattices; OFDM; Pulse modulation; Pulse shaping methods; Robustness; Scattering parameters; Shape; Time frequency analysis; Hexagonal Gabor frame; lattice; multicarrier transmission; orthogonal frequency-division multiplexing (OFDM); pulse shaping; quincunx; robustness factor; time-frequency dispersive channels;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2006.890884