  In this paper, we propose a serially concatenated turbo-encoded
faster-than-Nyquist signaling (FTNS) transceiver that takes into account
FTNS-specific colored noise effects. The proposed low-complexity receiver
carries out soft-decision frequency-domain equalization with the aid of the
minimum-mean square error criterion while whitening the colored noise.
Simulation results demonstrate that the proposed multi-stage-concatenated FTNS
system achieves a better error-ratio performance than previous systems that do
not consider colored noise effects in the high-symbol-packing FTNS regime.
Furthermore, as an explicit benefit of the proposed iterative decoder,
near-capacity performance is achieved with practical decoding complexity.
