Spectrum Suppressed Transmission Applied by Higher Coding Rate FEC

Spectrum suppressed transmission is one of the most effective schemes to increase frequency utilization efficiency by making its required bandwidth narrower than the Nyquist bandwidth. In this scheme, ISI(Inter Symbol Interference) caused by spectrum suppression makes its transmission quality worse, so an FEC(Forward Error Correction) must be needed. However, the previous studies of the spectrum suppressed transmission have been limited to the usages of higher coding gain FECs. In this paper, we propose the spectrum suppressed transmission applied by higher coding rate FEC with a coding rate of three-fourth and its frequency utilization efficiency increases are clarified by computer simulations.