Coupling channel identification for OFDM relay station in SFN

The paper is concerned with identification of coupling channel and multi-path channel for SFN relay station in the OFDM transmission systems. Channel identification is important and necessary to design a stable coupling canceller. Nevertheless, it is a difficult issue to identify an overall relay transfer function in full-band since the transmitted OFDM signals are band-limited. The purpose of this paper is to propose a new identification scheme of the relay transfer function from the transmitted signals of a key station to the retransmitted signal of a relay station, by efficiently making use of property of the OFDM signals with CP. Moreover, an upper bound on the transfer function estimation error is also evaluated.