Inter-symbol Interference Suppression Scheme using Periodic Signal Waveform for Fixed-rate COFDM Systems

This paper proposes an inter-symbol interference (ISI) suppression scheme using the periodic signal waveform for fixed-rate coded OFDM systems. In this scheme, the periodic signal waveform composed of the even-numbered sub-carrier group is used for extending the guard interval, and the odd-numbered sub-carrier group is also enabled to be available by means of frequency conversion in order to realize the sub-carrier group selection. This paper mainly focuses on the combining effect of the sub-carrier group selection and the channel coding scheme in the inter-symbol interference (ISI) condition. Computer simulation results show that the proposed scheme has the great potential to create the combined frequency diversity effect without the error floor even in the severe ISI condition