| Popis: |
In this paper, we propose a decision feedback differential detection (DF-DD) solution for orthogonal frequency division multiplexing (OFDM) system with angle differential quadrature amplitude modulation (ADQAM) scheme to reduce the inter-subcarrier interference (ICI) emerged in high mobility environments. Compared to the conventional differential detection (CDD), the proposed scheme can improve the system performance. A detailed performance investigation is made among the ADQAM-OFDM, DAPSK-OFDM, and coherent QAM-OFDM in addtive white Gaussian noise channels, multipath channels, and time-varying channels. Simulation results show that the proposed scheme is about 3 dB better than the conventional differential detection in high mobility environments. It is further suggested that ADQAM-OFDM technology is more suitable for high mobility environments. |
