Y. Fernández Somarriba, A. del Barrio Salas, J.L.
García García, and A. Herrera Guardado (Spain)
STBC, MC-CDMA, spreading
sequences, channel estimation, MIMO, RF topologies.
A new full implementation of a multicarrier
system for 4th
generation mobile communications is
presented. The implementation explains different
techniques: MC-CDMA or MC-DS-CDMA and their
choice based on characteristics of a MIMO channel.
Moreover, complex sequences are found to be the best
way to improve the power amplifier efficiency because
of PAPR; and the spreading length used to guarantee
the system quality. To achieve complete results, an
exponential channel model has been developed and
space-time coding has been introduced to obtain the
highest performance depending on spatial and temporal
diversity in a MIMO channel, using two different
channel estimation techniques. Finally, some comments
are included about integrated transmitted and received
RF architectures, which are the most suitable for these