Improving the Spectral Efficiency of OFDM System Using Raised Cosine Filter

The current research trends towards mobile broadband communications highly focused on mitigating the power spectral analysis and frequency localization issues associated with Orthogonal Frequency Division Multiplexing namely OFDM signals. There are various existing research works have been found ensure less efficient communications strategies. Therefore to address various interference problems during transmission data filter, OFDM has been conceptualized and implemented. Most of the f-OFDM techniques have been designed without coding. The proposed study aims to develop a higher order modulations e.g. QAM/PSK based filtered OFDM system to mitigate the intersymbol interference issues of channel properties. The proposed system has been configured and simulated in a realtime test bed (Matlab). The proposed system uses Root Raised Cosine (RRC) filter design specification and it also integrated the filter modules in the transmitter and the receiver side. The experimental outcomes of the proposed system show that it achieves very higher signal quality on less amount of bit error rates and the huge amount of power spectral density at the receiver end. It also achieves a high data transfer rate, well utilization of bandwidth as well as frequency localization factors as compared to the conventional OFDM models. Index Terms Filtered Orthogonal Frequency Dvision Multiplexing (f-OFDM); Root Raised Cosine (RRC)Filter , PSK(Phase Shift Keying) , Frequency Localization.