Novel OFDM transmission scheme to overcome caused by multipath delay longer than cyclic prefix

This paper proposes the novel OFDM transmission scheme that can effectively overcome ISI by adjusting CP length. As a way of combating ISI caused by multipath delay longer than guard interval, interference canceller or powerful channel coding has been proposed. Such approaches may reduce ISI, but it needs much complex computation or considerably decreases transmission efficiency to completely eliminate ISI. In our proposed scheme, CP length can be adaptively controlled by simply adjusting sampling rate. Hence it does neither much increase receiver complexity nor decrease effective data rate, compared to the conventional schemes. Our simulation results show that by employing the proposed OFDM transmission scheme, ISI can be effectively avoided in mobile environment with various multipath delays.