Abstract
Building on a recently introduced quadratic multiple-input
multiple-output (Q-MIMO) channel model making use of quadratic forms instead
of linear channel matrices, we explore diverse signaling formats over the
Q-MIMO channel in the frequency flat regime, highlighting the unique characteristics
of optical multimode fiber (MMF) systems versus their wireless counterparts.
In particular, we treat multiple-input single-output multimode fiber systems,
comparing them with single-input single-output MMF systems and obtaining insight
into the possibility of efficiently coupling the output of an MMF into a single-mode
fiber. We further treat vector amplitude modulation over MMF MIMO and study
the receiver zero-forcing (ZF) technique for MMF MIMO transmission, deriving
its performance and comparing with a recently introduced ZF beamforming technique
based on precoding at the transmitter, which is shown to be superior to receiver
ZF.
© 2008 IEEE
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