Joint time and frequency domain double differential detection and equalization for DFT scrambling vector OFDM under fast fading channels

Although differential detection and equalization with scrambling decision feedback can help DFT scrambling vector OFDM (DFT-SV-OFDM) system under frequency-selective fading channels with channel estimation errors, however, high mobility which caused random Doppler frequency shift may significantly degrade the achievable BER performance. In this paper, a new joint time and frequency domain double differential detection and equalization is proposed for DFT-SV-OFDM system, where differential detection is fulfilled both in time and frequency. Compared with the two existing systems, the new scheme shows more robust under the rapidly time-varying fading channels.