2021 年 25 巻 5 号 p. 163-173
This paper proposes a multi-carrier (MC) modulation scheme employing differential trellis-coded modulation (DTCM) and multiple differential detection with channel prediction, in order to cope with doubly-selective fading at good required signal-to-noise power ratio (SNR), where doubly-selective channels correspond to severe time/frequency-selective channels. For frequency-selective fading, MC modulation schemes are effective. For time-selective fading, multiple differential detection employing per-survivor processing (PSP-MDD) with channel prediction is effective. However, channel prediction degrades the required SNR for PSP-MDD. In order to cope with doubly-selective fading and improve the required SNR, this paper proposes MC-DTCM employing PSP-MDD with channel prediction. Finally, computer simulation results show that the proposed scheme can improve both the performance for doubly-selective fading and the required SNR compared with the conventional PSP-MDD with channel prediction, and the proposed scheme is suitable for large-cell train radio communications.
