Joint Overlap FDE & Spectrum Combining for Single-carrier Transmission without Cyclic Prefix Insertion

In the square-root Nyquist transmit-filtered single-carrier (SC) transmission, increasing the roll-off factor can reduce the peak-to-average power ratio (PAPR) of the transmit signal. Furthermore, since the signal bandwidth becomes wider, larger frequency diversity gain can be achieved. In our previous work, we proposed joint minimum mean square error frequency-domain equalization (MMSE-FDE) & spectrum combining for the cyclic prefix (CP) inserted SC block transmission. However, the CP insertion reduces the spectrum efficiency. In this paper, we propose a joint overlap FDE & spectrum combining for the Nyquist filtered SC transmission without CP insertion. The BER performance of the proposed method is evaluated by computer simulation. We show that the proposed method can achieve almost the same performance as the conventional MMSE-FDE with CP insertion and improve the BER performance by increasing the roll-off factor. Keywords; Overlap FDE, transmit filter, oversampling, singlecarrier transmission