점대점 무선통신을 위한 OFDM 기반 동적 스펙트럼접속

To resolve frequency spectrum shortage problem, dynamic spectrum access (DSA) technology has been researched recently. In this paper, we propose a new design concept of OFDM based DSA waveform, implement it on commercial SDR platforms and demonstrate its applicability for point to point communication. Adopting overlay method for opportunistic spectrum access, we define common control and data channels in physical layer, and two-way handshaking protocol in MAC layer to establish the link. Also, the designs and implementations of three software engines including cognitive, policy and sensing are performed. Using these components above-mentioned, a demonstration with multimedia data was successfully performed.