Abstract

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.

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