Correlation-Aided Nonlinear Spectrum Detection

It is shown that a higher spectral efficiency (SE) can be achieved in a narrow-bandwidth b-modulated NFDM subsystem than a moderate-bandwidth one. Exploiting the statistical correlation between the noise in the sub-carriers-which is shown to be stronger in narrow-bandwidth b-modulated NFDM subsystems than in moderate or wide-bandwidth ones-a linear minimum mean-squared error receiver improves signal detection. The achievable SE is increased by 0.94 b/s/Hz compared to that achieved by the matched filter receiver in a 5 GHz b-modulated NFDM subsystem.