Title of article :
Optimization of Nonlinear Signal Constellations for Real-World MIMO Channels
Author/Authors :
B. Clerckx، نويسنده , , L. Vandendorpe، نويسنده , , D. Vanhoenacker-Janvier and F. Silveira ، نويسنده , , and C. Oestges، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Abstract :
The performance of spatial multiplexing (SM)
multiple-input multiple-output (MIMO) communication systems
is highly dependent on the richness of scattering, the presence
of dominant components, and the interelement spacings. In this
paper, a new interpretation of the impact of transmit correlation
on the performance of SM is given based on a so-called
“symbol-related array factor.” Nonlinear signal constellations
for SM over real-world fading channels are then designed by
minimizing an estimate of the average symbol error rate under an
average transmit power constraint. The new transmission scheme
exploits the spectral efficiency advantage of SM and the robustness
of eigen-beamforming. Through simulations, it is shown
to be more robust against fading correlations and high Ricean
K-factors than SM using the classical phase shift keying (PSK)
and quadrature amplitude modulation (QAM) constellations.
The symbol error rate performance of this scheme is not affected
by a change in the propagation environment or the interelement
distance. Furthermore, if the scheme is used on the uplink, no
explicit rate-consuming feedback link from the base station to the
mobile station is required.
Keywords :
beamforming , correlated channels , multipleinputmultiple-output (MIMO) , space-time coding , spatialmultiplexing.
Journal title :
IEEE TRANSACTIONS ON SIGNAL PROCESSING
Journal title :
IEEE TRANSACTIONS ON SIGNAL PROCESSING