Joint SCO and CFO estimation algorithm for ISS-OFDM systems

ISS-OFDM is a relatively new type of modulation which received undeservedly little attention and was forgotten. This paper shows that it is possible to revive ISS-OFDM as a new fading-resistant spread spectrum technique. This study focuses on ISS-OFDM synchronization issues, primary on joint sampling clock and carrier frequency offset (SCO and CFO) estimation. It is the first paper investigating this question in context of ISS-OFDM. The impact of SCO and CFO is studied analytically and two new joint SCO and CFO estimators are proposed and compared with the one commonly used in OFDM systems. One of the proposed estimators outperforms the conventional one.