Joint Iterative Channel Estimation and Detection for OFDM/OQAM System

Compared with OFDM system with Cyclic Prefix (CP-OFDM) which satisfies strictly complex field orthogonality, OFDM/Offset QAM system (OFDM/OQAM) only satisfies the real field orthogonality. Therefore, in present of multipath fading channel, the Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI) always exist in the OFDM/OQAM system if utilizing the conventional preamble based channel estimation method for CP-OFDM system. In this paper, a joint iterative channel estimation and detection is proposed for OFDM/OQAM system. The proposed method exchanges the information between channel estimator and demodulator to remove the ISI and ICI effectively. Simulation results demonstrate that as the number of iterative time increasing, BER performance of the joint iterative channel estimation and detection method is approximately close to perfect channel estimation.